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Tytuł:
Realne możliwości utylizacji metanu z powietrza wentylacyjnego kopalń węgla kamiennego z odzyskiem energii
Feasible prospect of methane removal from ventilation air of coal mine with energy recovery
Autorzy:
Gosiewski, Krzysztof
Pawlaczyk-Kurek, Anna
Manfred, Jaschik
Wojdyła, Artur
Kleszcz, Tadeusz
Machej, Tadeusz
Michalski, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/2175685.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Inżynierii Chemicznej PAN
Tematy:
spalanie termiczne
metan
reaktor rewersyjny
thermal combustion
methane
reversal reactor
Opis:
Omówiono problemy utylizacji niskostężonego metanu emitowanego z powietrzem wentylacyjnym kopalń węgla kamiennego do atmosfery. Dokonano krótkiego przeglądu proponowanych w literaturze metod takiej utylizacji, ze szczególnym uwzględnieniem aspektów realizacji przemysłowej na obiektach w dużej skali. Praca obejmuje doświadczenia IICh PAN w omawianej dziedzinie zarówno eksperymentalne jak i symulacyjne.
The problems related to the utilization of low-concentration methane emitted with the ventilation air from coal mines into the atmosphere are discussed. A short review of the methods of such utilization proposed in the literature was made, with particular emphasis on the aspects of industrial implementation on large-scale facilities. The work includes the experimental and simulation experiences of ICE PAS in the thermal combustion of methane in a flow reversal reactor.
Źródło:
Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk; 2021, 25; 75--119
1509-0760
Pojawia się w:
Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and research of piston working conditions of combustion engine in high thermal load conditions
Autorzy:
Jankowska-Sieminska, B.
Jankowski, A.
Slezak, M.
Powiązania:
https://bibliotekanauki.pl/articles/243400.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
piston
thermal load
thermal expansion
thermal shock
Opis:
Explanation of phenomena occurring in pistons of combustion engines which appear during heating and cooling processes in reference to standard materials and composite materials of high material proprieties is aim of the paper. Bring over researches were mostly directed on measurements of difference dimensions which appear during the piston work in the combustion engine. The paper concentrates on phenomenon of different proprieties of materials. The thermal stresses and shocks differ. In the thermal shock, thermal stresses are caused by instantaneous temperature gradients which appear at high engine speed. These stresses are determined thro temperature distribution and they do not differ from stresses in steady-state conditions. Researches concerning thermal expansions were performed by means of sensitive dilatometer which can work in simple and differential system. Changes of dimensions versus temperature function were measured with inductive sensor and the sensitive Pt-ptrh thermocouple, and results were referred to reference material-Platinum. Research results are illustrated on diagrams of different courses of changes of the of thermal expansion coefficient during heating and cooling of standard and composite materials. Values of the thermal expansion coefficient a for the heating and cooling are smaller for composite alloys. The course of the coefficient â during cooling can be higher or lower from the coefficient a during heating. Similar values were also received. Maximum differences were of 10%. Smaller values of the coefficient a for composite alloys cause that for such the same thermal loads temperature gradients will be smaller for composite alloys. Courses of changes of the coefficient â have a different characteristics suited from chemical composition of alloy, granularity of the composite component and thermal treatment.
Źródło:
Journal of KONES; 2007, 14, 3; 233-243
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanoaluminium: Is There any Relationship between Particle Size, Non-isothermal Oxidation Data and Ballistics?
Autorzy:
Gromov, A.
Teipel, U.
Powiązania:
https://bibliotekanauki.pl/articles/358282.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
combustion
thermal analysis
oxidation
nanoaluminium
Opis:
This article focuses on data analyses and comparisons for aluminium nanopowders (or nanoaluminium, nAl) reactions under slow (0.5-20.0 K/min, using DTA/DSC/TGA) and fast (>10000 K/min, combustion in solid propellant formulations) non-isothermal oxidation. Particle sizes were defined through the BET method. Active Al content was related with the averaged reactivity parameters, taken from published DTA/DSC/TGA data. The specific oxidation onset temperature for nAl was poorly correlated with the BET particle size under the conditions investigated. Furthermore, the BET particle size exhibited no correlation with the observed ballistic response (burning rate) at 3.0 MPa. A logarithmic correlation y = 17.484 ln(x) – 5813, with R² = 0.73, was found between nAl particle size and its aluminium content. A calibration equation for the oxidation onset temperature as a function of nAl particle size was determined as y = −0.0071x2 + 3.3173x + 479.32, with R² = 0.75. Specific features of the nAl (metallic aluminum content in nAl and the oxidation onset temperature) can be predicted based on the measured powder parameters (such as BET particle size).
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 3; 501-519
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing of internal combustion engines of motorcycles with the use of thermal imaging methods
Autorzy:
Magdziak-Tokłowicz, M.
Skrętowicz, M.
Wróbel, R.
Sroka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/949484.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
thermal analysis
thermography
thermal research of motorcycles
Opis:
The internal combustion engine should be rated for the thermal loads that come from different sources. Thermal analysis is important both for design purposes and for evaluating the conditions of its use. Very good results are obtained by a combination of non-invasive measurement techniques, such as research using infrared thermal imaging techniques [3, 11]. The purpose of the study was to determine the engine thermal load by evaluating the average temperature on the outside surface of the engine at many of its points for two selected motorcycle engines with similar displacement capacities. For many reasons, such as ecology, durability, engine strength and thermal performance when heating and cooling are critical. To accomplish this task, a thermographic technique for indirect evaluation has been used, thus creating the possibility of measuring the temperature in a dynamic manner. These are accurate measurements and most importantly do not interfere with the construction of the object under investigation. The engine was tested during operation according to external and load characteristics. As a result of the work, graphs of temperature curves of heating and cooling of the tested engines were compiled. The article presents a methodology for measuring the temperature fields of outer surface engines. The collected material will be used in the future for studying the equable load on the cylinders, and as accurately as possible determine the conditions of movement such as power, revolutions, flow rates, temperatures and pressures.
Źródło:
Journal of KONES; 2017, 24, 4; 181-186
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some problems pistons made from composite materials with small hysteresis to combustion engines
Autorzy:
Jankowska-Sieminska, B.
Powiązania:
https://bibliotekanauki.pl/articles/245555.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
combustion engine piston
composite alloys
thermal expansion
hysteresis
Opis:
Novel composite ma hysteresisterials on the pistons are characterised that they occur in them multiple intermetallic phases which crystallize in the high temperature, before crystallization of the alfa+beta (Al+Si) eutectic. For forming of pre-eutectic phases, chromium and molybdenum are introduced to silumins, and for derivation of multiple increased concentration of nickel and copper and decreased concentration of magnesium are accomplished. On the basis of evaluations of mechanical and thermal loads of combustion engines pistons applying essence of composite materials of combustion engines pistons, as well requirements for combustion engines pistons, especially high loaded engines are expressed. Test results of hardness, influence of temperature of casting, test results of mechanical properties, friction coefficient and coefficient of thermal expansion are presented in the paper. The special attention devoted to so called hysteresis coefficient of thermal expansion and hysteresis of the relative elongation in function temperature and time. Courses of coefficient of thermal expansion for standard and composite material are presented. Differences of the a coefficient during heating and cooling in function temperature are relative to kind of heat treatment. Two-stage heat treatment is beneficial for the obtainment small values of the a coefficient.
Źródło:
Journal of KONES; 2011, 18, 3; 123-128
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coefficient of thermal expansion as a component quality estimation of alloys on pistons of combustion engines
Autorzy:
Sieminska, B.
Powiązania:
https://bibliotekanauki.pl/articles/245892.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
engine pistons
thermal expansion
coefficient of thermal expansion
Opis:
The aim of realized works in the area of materials on pistons is: low thermal expansion, small differences of coefficient of thermal expansion between heating and cooling, high stiffness at elevated temperatures, high hardness and wear resistance. Changes in thermal expansion coefficient during heating and cooling may be very large, as well as during subsequent cycles of heating and cooling of an internal combustion engine pis ton with respect to standard silumin alloys usedfor pistons of internal combustion engines. The paper presents: coefficient of linear expansion a for the AlSi standard alloy, coefficient of linear expansion a for the AlSi alloy with the apositive differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the a negative differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the apositive and negative differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the apositive, negative and positive differences between cooling and heating, coefficient of linear expansion a for the AlSi alloy with the very small a differences between cooling and heating, coefficient relative elongation as afunction of temperature with the positive elongation differences between cooling and heating, coefficient relative elongation with the very small elongation differences between cooling and heating, coefficient the course of derivative as a function of temperature (T) during heating and cooling with the positive elongation differences.
Źródło:
Journal of KONES; 2009, 16, 4; 575-583
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of an unsteady non-premixed flame in a porous medium based on the thermal equilibrium model
Autorzy:
Pakdee, Watit
Sakkarangkoon, Thammasathit
Powiązania:
https://bibliotekanauki.pl/articles/1839676.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
porous combustion
non-premixed combustion
local thermal equilibrium
pseudohomogeneous
numerical model
Opis:
The present research numerically investigates the non-premixed combustion of CH4 in a porous medium. The mathematical model proposed consists of conservation of mass, momentum, energy, and species equations. The discretized equations are integrated according to the third - order Runge - Kutta method. A porous medium is defined as a pseudohomogeneous medium. The proposed unsteady model is successfully validated with the published study. The model is able to describe physical behaviors of a non-premixed flame. The porous structure made of SiC gives higher temperature than when Al2O3 is used since SiC has higher thermal conductivity and lower heat capacity.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 3; 401-412
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of polar plasticizers on the characteristics of selected cyclic nitramines
Autorzy:
Elbeih, A.
Zeman, S.
Pachman, J.
Powiązania:
https://bibliotekanauki.pl/articles/358627.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic materials
polymers
sensitivity
combustion
thermal stability
Opis:
Dioctyl sebacate (DOS) is a plasticizer used with oily material for the softening of polyisobutylene binder (PIB) to form a polymeric matrix. This matrix was used for the preparation of various plastic explosives. The following energetic cyclic nitramines were used as explosive fillers: BCHMX (cis-1,3,4,6- tetranitrooctahydroimidazo [4,5 d]imidazole), ε-HNIW (ε-2,4,6,8,10,12- hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane), RDX (1,3,5-trinitro-1,3,5- triazacyclohexane), and HMX (1,3,5,7-tetranitro-1,3,5,7-tetrazacyclooctane). For comparison, Fluorel binder was used for the preparation of several plastic bonded explosives (PBXs) based on the same selected explosives. Impact and friction sensitivities of the prepared samples and the pure explosive fillers were measured. The thermal stability was studied using differential thermal analysis (DTA). High performance liquid chromatography (HPLC) was used to detect the presence of BCHMX dissolved in dioctyl sebacate (DOS). The heat of combustion of the prepared samples and of the pure explosive fillers was measured using a bomb calorimetry. The results show that PIB softened by plasticizer (DOS) has a greater positive effect on decreasing the impact sensitivity of the studied pure explosives than Fluorel binder. On the other hand, the plasticizer acts as a solvent for the energetic materials and decreases the decomposition temperature of these plastic explosives.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 3; 339-349
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal of a piston engine with close thermal cycle of working medium
Autorzy:
Mitianiec, W.
Powiązania:
https://bibliotekanauki.pl/articles/242513.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
combustion engine
thermal cycles
closed system
Opis:
Ecological aspects and utilization of biomass as a fuel leads to applying of a closed work cycle in the piston engine. It forces usually to delivering of heat to working medium through a heat exchanger. The heat may get from any type of fuel in an external combustion chamber, which allows on precisely control of combustion process. The paper describes a new conception of the engine operating in two-stroke cycle with working medium being in the close system, the best with the perfect gas as argon or helium. The delivering process of working medium with high temperature from the heat exchanger takes place through the inlet valve during a few dozen degrees of CA rotation in piston position at TDC. Expansion stroke takes place until outlet valve opens shortly BBDC. The outlet period from the cylinder follows almost at constant pressure and at low temperature to an adiabatic chamber, from where the working medium is compressed by an adiabatic compressor to pressure near pressure being in the heat exchanger. The engine works in two-stroke cycle and enables to get low temperature and pressure as early as BDC through a long time of opening of the outlet valve. The paper presents the ideological scheme of the engine system and theoretical thermal cycle. On this basis one presents the theoretical description of the individual thermodynamic processes with determination of thermal parameters of the characteristic points of the cycle. This article determines also the thermal efficiency of such closed cycle. The presented engine may have a practical applying as a stationary engine in energetic systems, where as fuel may be biomass, which globally influences on decreasing of CO2 and NOx by temperature control of the combustion process
Źródło:
Journal of KONES; 2013, 20, 1; 209-217
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary research no vel composite materials with small hysteresis and high functional parameters for combustion engines pistons
Autorzy:
Siemińska-Jankowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/246073.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
engine pistons
thermal expansion
hysteresis
Opis:
Pistons of internal-combustion engines are the most loaded elements of internal-combustion engines, belong to these specialistic elements, which have essential influence on the ecological properties of engines, their durability and reliability. The object of paper is pistons manufactured from the standard material and from new research alloy. The investigations were performed with dilatometer permitting on the registration of changes of the dimensions of sample in the function of temperature and time. The measurements are possible in straight system and in differential system. Exemplary results of investigations are presented in the paper. During the piston heating, period preutectic phases succumb the partial dissolution in solid solution a, but in the cooling process they secrete again. As a consequence the piston partial deformation occurs, which by result is gradual growth of difference between its expansibility during the warming and contraction in the process of cooling (so-called hysteresis occurs). The characteristics of the new piston silumin alloys give possibility of dearances minimalization and the obtainments of a correct engine performance in the full range of engine rotational velocities and loads. The effect are the decrease of the oil expenditure, the decrease of the emission of hydrocarbons in exhaust gases, the decrease of blowbys to crankcase, the decrease of the expenditure of piston rings grooves wear and the piston skirt wear, the decrease of the piston deformation and the increase of engine durability and reliability.
Źródło:
Journal of KONES; 2009, 16, 1; 447-452
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Digital Terrain Model of a Coal Spoil Tip – A Way of Improving Monitoring and Early Diagnostics of Potential Spontaneous Combustion Areas
Autorzy:
Lewińska, P.
Dyczko, A.
Powiązania:
https://bibliotekanauki.pl/articles/952399.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
spoil tips
infrared
spontaneous combustion
monitoring
thermal DTM
Opis:
Spoil tips are anthropomorphic terrain structures built out of leftover materials from underground or open pit mining. Usually the term spoil tips refers to those build out of unusable particles from coal exploration. As such they consist mostly of slate and various types of sandstone or mudstone. But also include some amount of coal and, what is more important, coal dust. Fires of spoil tips are dangerous to the environment and humans. They can cause degradation of air, and water qualities. Sometimes degradation to the environment can be irreversible. The presented survey was done in two stages. the first included creating a general terrain model. This was done with the use of long range laser scanner. The second step was a more detailed analysis of spatial and temperature conditions. Two measuring seasons ware performed. The first included a survey made with a short range laser scanner and a hand-held inferred camera. The obtained point cloud was supplemented with temperature value with the use of software and hardware provided by the authors. The visualization of 3D discreet thermal model was done in Bentley MicrioStation. The second included a usage of Z+F IMAGER 5010 laser scanner equipped with T-Cam Rev 1.0 thermal camera insole. A new and unique device that connects laser scanner with infrared camera. This season also provide a point cloud with attached temperature value of measured points. This article provides the description of those two methods including a comparison of their effectiveness and costs. It also describes the heat conditions occurring on spoil tip of Lubelski Węgiel „Bogdanka” S.A coal mine surveyed in December 2015.
Źródło:
Journal of Ecological Engineering; 2016, 17, 4; 170-179
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza toksyczności produktów rozkładu termicznego i spalania uzyskanych w wybranych materiałów epoksydowych
Analysis of the toxicity of thermal decomposition and combustion products obtained from selected epoxy materials
Autorzy:
Półka, M.
Powiązania:
https://bibliotekanauki.pl/articles/373240.pdf
Data publikacji:
2010
Wydawca:
Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
Tematy:
rozkład termiczny
spalanie
toksyczność
combustion
thermal decomposition
toxicity
Opis:
Toksyczność produktów rozkładu termicznego w środowisku pożarowym jest przyczyną większości wypadków śmiertelnych. Powszechne stosowanie materiałów syntetycznych do konstrukcji, wystroju i wyposażenia wnętrz zazwyczaj jeszcze bardziej zwiększa szybkość tworzenia się zagrożeń toksycznych w pomieszczeniu podczas pożaru. Stąd też celem niniejszego artykułu jest analiza toksyczności produktów rozkładu termicznego i spalania uzyskanych zgodnie z PN-88/B-02855 z materiałów epoksydowych utworzonych podczas spalania żywic epoksydowych Metoda wykorzystana w pracy służy do badania materiałów budowlanych i materiałów wyposażenia wnętrz mogących wydzielić toksyczne produkty rozkładu termicznego i spalania. Do badań eksperymentalnych w niniejszym artykule wykorzystano nie modyfikowane i modyfikowane przeciwogniowo żywice epoksydowe w postaci wylewek podłogowych, wyprodukowane przez Zakłady Chemiczne "Organika - Sarzyna" w Nowej Sarzynie. Niemodyfikowane badane żywice epoksydowe występują pod nazwą handlową Epidian 562. Jako antypireny zastosowano Roflam E, Roflan P, Roplast FN-1 wyprodukowane w Zakładach Chemicznych "Rokita S.A." w Brzegu Dolnym. Skład chemiczny każdej z badanych próbek różnił się rodzajem użytej substancji obniżającej palność żywic epoksydowych. Ilość dodanych środków ogniochronnych do żywic epoksydowej (Epidian 561) była taka sama, a mianowicie wynosiła 5% wag. Dodatek środków ogniochronnych do żywicy epoksydowej Epidian 561 zmniejsza emisje głównych toksyn tj. CO i CO2, wyznaczonych zgodnie z PN-88/B-02855. Najbardziej niebezpieczny materiałem pod względem toksyczności głównych gazów CO i CO2 okazał się nie modyfikowany ogniochronnie Epidian 561. Zakwalifikowanie badanych utwardzonych żywic epoksydowych do grupy materiałów umiarkowanie toksycznych pozwala na stosowanie ich jako materiałów wykończenia wnętrz w strefach pożarowych ZL I, ZL II, ZL III i ZL IV (w myśl rozporządzenia Ministra Infrastruktury z dnia 12 kwietnia 2002 r. w sprawie warunków technicznych, jakim powinny odpowiadać budynki i ich usytuowanie (Dz. U. Nr 75, poz. 690 z późn. zmianami).
The toxicity of thermal decomposition products in a fire environment is the cause of the majority of mortalities. The common use of synthetic materials for construction, decoration and furnishings of the interior as a rule tends to increase even more the creation rate of toxic hazards in a room during a fire. Consequently the objective of this paper is making an analysis of the toxicity of thermal decomposition and combustion products obtained according to PN-88/B-02855 of epoxy materials during combustion of epoxy resins. The method adopted in the paper is applied for testing building materials and interior decoration materials which could emit toxic products of the thermal decomposition and combustion. In experimental testing executed for needs of this paper used was made of fireproof non-modified and modified epoxy resins in the form of flooring compounds, produced by Zakłady Chemiczne "Organika - Sarzyna" in Nowa Sarzyna. The tested non-modified epoxy resins may be found under the trade name Epidian 561. The used antipyrenes comprised Roflam E, Roflam P, Roplast FN-1 produced by Zamkłady Chemiczne "Rokita S.A." in Brzeg Dolny. The chemical composition of each of the tested samples differes with respect to the type of used substance that reduced the flammability of epoxy resins. The amount of added fire retardants to the epoxy resin (Epidian 561) was the same, and equalled to 5% by weight. The addition of fire retardants to the Epidian 561 epoxy resin emissions of the main toxins, i.e. CO and CO2 determined according to the standard PN-88/B-02855. As it turned out, the most hazardous material with respect to toxicity of the main gases, CO and CO2, proved to be Epidian 561 not modified with flame retardants. The qualification of the tested hardened epoxy resins to the group of moderately toxic materials allows their application for interior decoration elements in fire zones ZL I, ZL II, ZL III and ZL IV (in accordance with Regulation of the Minister of Infrastructure dated 12 April 2002 on technical requirements which have to be met by buildings and their situation (Journal of Laws - Dz. U. Nr 75, item 690 with subsequent amendments).
Źródło:
Bezpieczeństwo i Technika Pożarnicza; 2010, 3; 73-81
1895-8443
Pojawia się w:
Bezpieczeństwo i Technika Pożarnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composite alloy for IC engine pistons
Autorzy:
Jankowska-Sieminska, B.
Jankowski, A.
Sławinski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/246922.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
engine pistons
composite alloys
thermal analysis
Opis:
Aluminum is the most popular matrix for the metal matrix composites The Al alloys are attractive due to their low density, their capability to be strengthened by precipitation, their good corrosion resistance, high thermal and electrical conductivity, and their high damping capacity. The characteristics of metal matrix composite materials are determined by their microstructure and internal interfaces, which are affected by their production and thermal mechanical treatment. Investigations to improve the combustion piston engines arę leading to improve the working process performance by increase ofits parameters, especially the average temperature of the thermodynamic cycle. New piston consists of two parts manufactured of standard and composite materials are presented in the paper. Composite alloy has chemical composition of short fibre with Al2 O3 was following, in the mass percentage: 96% Al2 03, 4%, SiO2. As the binder the colloidal silica was used in quantity 5%. The volume of fibres in the insert was 22 plus or minus 2% by volume. Bending strength of the insert was 0.5 MPa. Temperature and stresses distribution in standard piston and different versions of composite pistons are introduced in the paper. The paper presents the resistance of investigated materials on thermal shocks. Experimental veriflcation of manufactured composite pistons in the engine proved the larger exhaust temperaturę for about 20-70°C, in comparison with the engine with standard pistons (that gives the greater effectiveness of turbo charging application), proved the lowering of a individual volume of gases blow-bys to the crankcase, the lowering of noise level, larger resistance on thermal loads.
Źródło:
Journal of KONES; 2010, 17, 2; 159-166
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research results of novel composite materials with low hysteresis during heating and cooling for pistons of combustion engines
Autorzy:
Sieminska, B.
Powiązania:
https://bibliotekanauki.pl/articles/245037.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
internal combustion engines
engine piston
thermal expansion
emissions
Opis:
Research results of novel silumins on pistons for combustion engines, which have high mechanical properties within the range of piston higher operating temperatures, 100-300°C, are presented in the paper. Silumins contain enlarging concentration of the nickel and copper alloy additives up to 4.0, and chrome and molybdenum alloy additives up to 1.0%. Occurrence of given microstructure in piston-silumins results in almost the same values of the coefficient thermal expansion during the heating up to the 300 °C temperature and during the next cooling into the ambient temperature. Small values of the coefficient of expansion of thermal and small differences between values of the coefficient of thermal expansion during heating and cooling enable on application of small values of working clearances between piston and the cylinder liner. As a consequence they make possible, the low exhaust emission level, and the low noise level. The pistons from alloys with small values ofthe coefficient of thermal expansion, small differences of this coefficient during heating and cooling are novel aspects presented in paper. Research results of strength and metallographic parameters, research results of the coefficient of thermal expansion, comparative engine research results are represented in the paper. In particular representative chemical components for a standard alloy and novel alloy, mechanical properties investigated alloys after solution heat treatment, wear resistance of novel alloy compared with two cast irons, ATD curves, fibrous construction, silicon construction, microstructure of novel alloy, courses of changes of the coefficient of thermal expansion in the function of the temperature during heating and cooling are presented in the paper.
Źródło:
Journal of KONES; 2010, 17, 1; 421-432
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of some parameters of SI internal combustion engine with exhaust gas recirculation
Analiza numeryczna wybranych parametrow pracy silnika ZI z recyrkulacja spalin
Autorzy:
Tutak, W.
Powiązania:
https://bibliotekanauki.pl/articles/792847.pdf
Data publikacji:
2011
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
internal combustion engine
combustion
exhaust gas recirculation
modelling
thermal cycle
engine parameter
knock combustion process
numerical analysis
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 69

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