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Tytuł:
Variability of the resistance to motion at engine crank-piston set
Autorzy:
Serdecki, W.
Krzymień, P.
Powiązania:
https://bibliotekanauki.pl/articles/242766.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
IC engine
piston-cylinder assembly
friction
friction losses
Opis:
The resistance to motion that accompany the combustion engine run affects its technical and economical indices. Appropriate modifications in design of constitutive parts as well as proper selection of kinematic pairs' collaboration data might lead to the minimization of resistance, above all the frictional one. In order to estimate precisely this resistance as well as the area and reasons of their generation certain measurement methods are implemented that facilitate size of resistance and changes occurring within a single cycle. Beside methods requiring interference into engine's construction other methods are used, among other the motoring method. Despite the advantages like simplicity, there are also problems with the use of this method. The most important are: different measuring conditions (no fires) and measurement of the resistance average value. In a course of described simulations evaluation of mutual relations between friction forces and torques relative to different sources have been carried out, in particular those relating to the crank - piston assembly. A trial to give the answer if it is possible to distinguish the effect of individual resistances at certain engine subassemblies in the total resistance torque was the main effect of presented analysis. Exemplary calculations have been carried out for the 170A.000 type engine.
Źródło:
Journal of KONES; 2007, 14, 4; 416-425
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the ignition control in the HCCI system using dose of monoatomic inert gas
Autorzy:
Postrzednik, S.
Przybyła, G.
Żmudka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/248032.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
IC engine
HCCI system
ignition control
charge compression
Opis:
The subject of the analysis presented in the paper is the idea and implementation method of the ignition point of homogeneous air-fuel mixture, used in the IC engine with HCCI system. Autoignition of the combustible mixture can occur only upon reaching the characteristic self-ignition temperature Tz. It should take place during (near end) the load compression. In order to achieve the fuel mixture ignition temperature Tz in the system, usually it is proposed adjusting the engine compression ratio, epsilon. However, it is quite cumbersome especially in case of frequent changes of engine load (there are also difficulties with the precise advance angle adjusting of fuel mixture ignition). According to our conception, the other method of autoignition adjustment can be successfully applied. The essence of the new idea consists in proper selection, according to engine load, of the exponent k of charge polytropic compression. Introducing the defined dose of monoatomic gas (e.g. argon Ar,k almost equal 1.667) to air-fuel mixture, the higher values of the polytropic compression exponent .. of working medium can be achieved. It will result in significant increase of the temperature rise Delta Tmax of the compressed charge and accordingly progressive increase of the advance angle of the mixture ignition.
Źródło:
Journal of KONES; 2012, 19, 1; 319-326
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of leaning hydrogen-air mixtures on engine combustion knock
Autorzy:
Szwaja, S.
Naber, J. D
Powiązania:
https://bibliotekanauki.pl/articles/243860.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
IC engine
lean hydrogen-air mixture
combustion knock
Opis:
Combustion of lean hydrogen-air mixtures in an internal combustion (IC) spark ignited (SI) engine in respect of combustion knock effect is presented in this paper. It is known that making the combustible mixture leaner leads to both decreasing in-cylinder peak temperature of combustion and lengthening ignition lag. It also increases combustion duration. Having these issues on mind it could be concluded that combustion knock intensity decreases as well. It is reported that such a hypothesis is also correct when hydrogen based fuels are combusted in the IC engine, although hydrogen as an engine fuel, on the contrary to gasoline, is very susceptible to knock generation throughout the entire combustion duration. At the beginning the paper examines the combustion knock intensity on the basis of in-cylinder pressure traces. Next, a test-bed and obtained experimental results of hydrogen combustion in the IC single cylinder CFR engine are showed. Finally, analysis of knock intensity referring to lean hydrogen-air mixture ratio, expressed by the excess air number so-called lambda, is carried out. Significant conclusion from the analysis is that there is strong negative correlation between the hydrogen knock intensity and the excess air number lambda. In the end, comparison with exhaust gas recirculation as alternative way to reduce combustion knock, and constraints for leaning the hydrogen-air combustible mixture for the IC engine are discussed in the paper.
Źródło:
Journal of KONES; 2008, 15, 2; 483-491
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wiebe function parameter determination for mass fraction burn calculation in an ETHANOL-GASOLINE fuelled SI engine
Autorzy:
Yeliana, Yeliana
Cooney, C.
Worm, J.
Michalek, D.
Naber, J.
Powiązania:
https://bibliotekanauki.pl/articles/949481.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ethanol-gasoline blend
mass fraction burn
IC engine
Wiebe function
Opis:
The Mass Fraction Burn (MFB) and Heat Release Rate (HRR) reflect the amount of fuel burned and the rate of burning throughout the combustion process in an internal combustion engine. These parameters play a crucial role in research and development endeavours focused on engine efficiency, emissions, and overall operating performance. Analytically in a Spark-Ignition (SI) engine, these parameters are often modelled with the Wiebe function, a well known mass fraction burn formulation, which is a function of "a" (efficiency parameter), "m" (form factor), crank angle, and the duration of combustion. This function is a simple but powerful correlation model that is well suited for zero and one dimensional engine cycle simulations. In this work, the Wiebe function parameters are determined over a range of fuel compositions and compression ratios by fitting the Wiebe function curve to the experimentally obtained MFB data from a single-zone HRR analysis. The Wiebe function parameters are determined using a curve fitting model by finding the minimum of a scalar function of several variables. This functionality has been built into the single-zone mass fraction burned model. Experiments with five ethanol-gasoline fuel blends: E0 (gasoline), E20, E40, E60, and E84 were conducted on a SI Cooperative Fuels Research (CFR) engine while holding a constant load of 330 kPa Net Indicated Mean Effective Pressure (Net IMEP). There were five methods introduced to fit the Wiebe function parameters, which utilized a combination of least square method and direct algebraic solution. This paper details the process used to determine the Wiebe function parameters, and compare the results obtained using these methods for the ethanol-gasoline mixture concentrations.
Źródło:
Journal of KONES; 2008, 15, 3; 567-574
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the environmental performance of the internal combustion engine by the use of in-cylinder catalyst
Autorzy:
Andrych-Zalewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/133717.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
IC engine
catalyst
in-cylinder catalysis
silnik spalinowy
katalizator
kataliza
Opis:
The problems of using the inner surfaces of a combustion chamber as catalytic converters in order to reduce the harmful exhaust emissions were discussed in this paper. The proper choice of the catalyst is one of the most important issues. The interaction between the burned mixture and the catalyst is not limited by the kinetics of the chemical reactions but depends primarily on the flow rate of the reactants to the catalyst surface during combustion. The lifespan of a catalytic layer is determined by the application technique, where plasma spraying is the most popular and most accessible method. However, when it comes to the catalytic coating durability, it is not an efficient option, as ion implantation is indicated shows greater potential in this respect. In this research the coating of aluminum titanium and chromium-nickel have been applied to the engine head and the piston crown. Then the modified catalytic parts were used in a CI combustion engine and the obtained emission results were compared with the reference results. Another set of tests was performed for an SI engine, powered with gasoline and methane, where the piston crown was covered with a thermal layer of zirconium oxide and a catalytic layer of platinum. The beneficial effects of these in-cylinder catalysts on exhaust emissions and the possible problems in the wide spread use of such solutions have been presented.
Źródło:
Combustion Engines; 2017, 56, 1; 129-132
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of parameter modifications in the Diesel engine power system on the emissions of harmful compounds
Autorzy:
Merkisz, Jerzy
Bajerlein, Maciej
Zieliński, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/2097448.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
IC engine
chip tuning
CI
PEMS
silnik o spalaniu wewnętrznym
chiptuning
Opis:
The article presents the results of emission tests and vehicle operation indicators fueled with diesel oil. The tests were carried out for a passenger vehicle equipped with a diesel engine meeting Euro 3 emissions standard, moving in urban traffic. The measurements were carried out using modern PEMS (Portable Emission Measurement System) enabling the emission of gaseous components from exhaust systems of the tested object. On the basis of the conducted tests, the load characteristics were determined using the torque values obtained along with the engine speeds. The measurement route included two cycles: urban driving and fast acceleration. The aim of the study was to assess the impact of modifications to the control maps on CO, CO2, PM and NOx exhaust gas emissions under real operating conditions.
Źródło:
Combustion Engines; 2020, 59, 1; 36--40
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Internal combustion engine vibration based fault detection using wavelet packet transform
Przetwarzanie sygnałów za pomocą transformacji falkowej w diagnostyce wibroakustycznej silników spalinowych
Autorzy:
Madej, H.
Powiązania:
https://bibliotekanauki.pl/articles/327700.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
analiza falkowa
silnik spalinowy
diagnostyka drganiowa
wavelet transform
IC engine
diagnostics
Opis:
In this paper, the wavelet transforms of vibration acceleration signals which were acquired from the cylinder head and engine block for various faulty and healthy conditions of IC engine was used to fault detection. The engine which has been tested is 4-cylinder 4-stroke with eight valves fed with petrol and LPG. Many mechanical fault detection techniques based on vibration analysis have been developed over the last few decades. The analysis of vibration signals associated with internal combustion engines is complicated due to the complexity of the engines and different sources of vibration. The engine vibration signal is inherently a transient one even in engine steady operation. The time-frequency localization features of the wavelet transforms make them suitable for IC engine fault diagnosis and monitoring. In the present investigation, a fault diagnosis technique based on wavelet packet transform (WPT) i used to engine fault detection. The experimental results show that proposed method is useful for detection the faults in various engine working conditions.
W artykule przedstawiono przykłady zastosowania analizy falkowej sygnałów przyspieszeń drgań zarejestrowanych na kadłubie i głowicy silnika ZI w celu wykrycia symulowanych uszkodzeń. Obiektem badań był 4-ro cylindrowy silnik spalinowy zasilany alternatywnie benzyną i LPG. W ostatnich latach opracowano i rozwinięto wiele metod diagnozowania opartych na pomiarach drgań. Analiza sygnałów drgań związanych z pracą silnika spalinowego jest utrudniona ze względu na złożony sygnał wywołany jednoczesnym działaniem wielu źródeł. Sygnał przyspieszeń drgań rejestrowany na kadłubie i głowicy silnika jest niestacjonarny i zawiera składowe impulsowe. Dlatego w diagnostyce drganiowej silników korzystne jest stosowanie metod czasowo-częstotliwościowych takich jak analiza falkowa, które umożliwiają tworzenie użytecznych cech diagnostycznych. W artykule przedstawiono przykłady zastosowania pakietu analizy falkowej (WPT) do wykrywania symulowanych uszkodzeń silnika. Z badań wynika, że zastosowana metoda może być użyteczna do diagnozowania różnych uszkodzeń silnika spalinowego.
Źródło:
Diagnostyka; 2009, 2(50); 73-78
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the tightness of the combustion chamber of an diesel engine during long-term operation
Autorzy:
Koszałka, G.
Powiązania:
https://bibliotekanauki.pl/articles/244031.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
IC engine
blowby
compression pressure
leak-down test
piston ring
cylinder
wear
Opis:
The paper presents results of research on changes in the tightness of the combustion chamber during long-term operation. The study was conducted on 5 six-cylinder diesel engines with a swept volume of 6.8 dm mounted in medium size trucks. All 5 trucks were used and serviced in similar conditions. The changes in the tightness o f the combustion chamber were determined on the basis of the results of periodical measurements of maximum compression pressure in cylinders, drop of pressure during a cylinder leakage test and blowby rate under different conditions of engine operation. The investigation was carried out in the range of vehicle mileage of 0-450,000 km. The results show ed that in the initial period of engine use (0-40,000 km) the tightness of the combustion chamber improved, after which it gradually deteriorated. For mileages of over 40,000 km, the significance of linear correlations between results of all tightness measurements and mileage were conflrmed and regression lines were determined. Mean rates of changes in the individual tightness parameters differed considerably among one another. Mazimum compression pressure changed the slowest and blowby the fastest together with mileage. Mean value of maximum compression pressure at 440,000 km was only 13% lower than at 40,000 km, whereas blowby rate at full engine loadat 2200 rpm was 125% higher.
Źródło:
Journal of KONES; 2010, 17, 3; 215-222
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bio-oil blended butanol as a fuel to the spark ignition internal combustion reciprocating engine
Autorzy:
Chwist, M.
Szwaja, S.
Grab-Rogaliński, K.,
Pyrc, M.
Powiązania:
https://bibliotekanauki.pl/articles/973120.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
bio-oil
pyrolysis
butanol
IC engine
bioolej
pyroliza
silnik z zapłonem samoczynnym
Opis:
The article presents results on combustion of the bio-oil blended butanol in the spark ignition engine. Bio-oil is a mixture of hydro-carbons condensing to liquified phase while cooling it down to ambient temperature. In general, the liquid called bio-oil is a byproduct of the pyrolysis process of organic matter. Results from analysis presented in the manuscript include the following: in-cylinder pressure traces and toxic exhaust emissions. Finally, comparison of these results with results from combustion of n-butanol reference fuel were provided. Obtained results indicate satisfactory, eco-friendly possibility for utilization of bio-oil in the internal combustion engine.
Źródło:
Combustion Engines; 2017, 56, 2; 93-96
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostics of clearance in the piston-cylinder assembly using Hoelder coefficients
Diagnozowanie luzu w układzie tłok-cylinder z wykorzystaniem współczynników Hoeldera
Autorzy:
Madej, H.
Czech, P.
Powiązania:
https://bibliotekanauki.pl/articles/328870.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
diagnostyka
silnik spalinowy
ciągła transformata falkowa
diagnostics
IC engine
continuous wavelet transform (CWT)
Opis:
The paper gives an overview of the results of the attempt to utilise Hoelder coefficients for the detection of clearance in piston-cylinder assembly of a combustion engine with spark ignition. Condition of the engine tested was evaluated based on the accelerations of vibrations recorded on the engine body. The vibration acceleration signals were analysed with the aid of continuous wavelet transform (CWT). Properly processed results of the wavelet analysis allowed modified Hoelder coefficient values to be obtained. According to the study, the coefficients obtained can be useful in evaluating the condition of a combustion engine.
W opracowaniu przedstawiono wyniki próby zastosowania współczynników Hoeldera do wykrywania luzów w układzie tłok-cylinder silnika spalinowego z zapłonem iskrowym. Ocenę stanu diagnozowanego silnika prowadzono na podstawie przyspieszeń drgań zarejestrowanych na korpusie silnika. Sygnały przyspieszeń drgań analizowano za pomocą ciągłej transformaty falkowej (CWT). Odpowiednio przetworzone wyniki analizy falkowej umożliwiły uzyskanie zmodyfikowanych współczynników Hoeldera. Z badań wynika, że uzyskane współczynniki mogą być przydatne w rozpoznawaniu stanów silnika spalinowego.
Źródło:
Diagnostyka; 2009, 1(49); 73-78
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Property determination for ethanol-gasoline blends with application to mass fraction burn analysis in a spark ignition engine
Autorzy:
Yeliana, Yeliana
Worm, J.
Michalek, D.
Naber, J.
Powiązania:
https://bibliotekanauki.pl/articles/950185.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ethanol-gasoline blend
mass fraction burn
heat release
IC engine
fuel-air mixture properties
Opis:
The Mass Fraction Burn (MFB) and Heat Release Rate (HRR) reflects the amount of fuel burned, and the rate of burning throughout the combustion process in an internal combustion engine. These parameters play a crucial role in research and development endeavors focused on engine efficiency, emissions, and overall operating performance. They are computed by analyzing measured pressure data and applying thermodynamic principals to determine the energy released during the combustion process. Thus, the properties of the fuel-air and combusted gas mixtures play an important role in the analysis. Engine pressure data were taken from a Spark-Ignition Cooperative Fuels Research (CFR) engine operating at a constant load of 330 kPa Net Indicated Mean Effective Pressure (Net IMEP) and using five ethanol-gasoline fuel blends: E0 (gasoline), E20, E40, E60, and E84. The fuels were assumed to be in a non-reacting state throughout the mixing process. Once the fuel mixture properties were known, the fuel-air and burned mixture properties were determined using the fuel-air mass ratio. The analysis presented within this paper details the process by which the fuel, fuel-air, and burned mixture properties can be determined. The MFB of five different fuel blends at a chosen operating condition was also presented along with the pressure trace, the temperature and the gamma profile at the end of this paper.
Źródło:
Journal of KONES; 2008, 15, 2; 553-561
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study on performance and emission characteristics of lean burn SI engine fuelled with hydrogen methane blends
Badania silnika spalinowego ZI zasilanego nadstechiometryczną mieszanką metanu z wodorem
Autorzy:
Przybyła, G.
Nagaraja, S.
Powiązania:
https://bibliotekanauki.pl/articles/133095.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
IC engine
hydrogen
indicated efficiency
specific emissions
silnik spalinowy ZI
wodór
sprawność indykowana
wskaźniki emisji
Opis:
An experimental study on the performance and exhaust emissions of a spark ignition engine fueled with methane(CH4)-hydrogen (H2) blends was carried out at a constant speed of 1500 rpm and fixed excess air ratio (λ) of 1.5. The tests were carried out for pure methane and 2 blends (93% (by vol.) CH4 + 7% (by vol.) of H2, 77% (by vol.) CH4 + 23% (by vol.) of H2) at part load conditions in a naturally aspirated, three cylinder engine with a compression ratio of 9.3:1. The effects of hydrogen addition was studied at various spark timing and it is observed that the Maximum Brake Torque timing (MBT) retarded with increase in concentration of hydrogen. The coefficient of variation in indicated mean effective pressure (COVimep) decreases in blends, indicating stable combustion with hydrogen enrichment. A decrease in burn duration is observed and the crank angle at which peak pressure occurred, is tending towards top dead center (TDC) with increase in concentration of hydrogen due to higher laminar flame speed of the mixture enriched with hydrogen. In case of blends, specific emissions of carbon monoxide (CO) and unburned hydrocarbons (HC) decreases. However, there is considerable increase in specific emissions of oxides of nitrogen (NOx).
Przeprowadzono badania eksperymentalne energetycznych parametrów pracy silnika spalinowego ZI oraz jego oddziaływania na środowisko naturalne podczas zasilania mieszaniną metanu z wodorem. Analizowano pracę silnika podczas spalania mieszanki ubogiej (λ = 1,5) przy stałej prędkości obrotowej wynoszącej 1500 obr/min. Badania wykonano dla zasilania czystym metanem oraz dwiema mieszankami o różnym udziale objętościowym wodoru tj. 7% H2, 93% CH4 oraz 23% H2, 77% CH4. Badano wpływ kąta wyprzedzenia zapłonu na przebieg procesu spalania. Zaobserwowano, że optymalna wartość kąta wyprzedzenia zapłonu zmniejsza się dla wyższej zawartości wodoru w mieszance palnej. Ponadto wskaźnik sygnalizujący poziom niepowtarzalności pracy indykowanej w kolejnych cyklach roboczych osiąga niższe wartości dla mieszanek wzbogaconych wodorem, co oznacza stabilniejszy przebieg procesu spalania. Spalanie mieszanek metanu z wodorem prowadzi do nieznacznego ograniczenia emisji CO oraz HC, natomiast wielkość emisji NOx rośnie za sprawą wyższej temperatury spalania dla mieszanki CH4 , H2.
Źródło:
Combustion Engines; 2015, 54, 3; 556-562
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical thermo-mechanical strength analysis of an IC engine component
Autorzy:
Ali, M. A. N.
Hussein, R. A.
Hussein, H. A.
Powiązania:
https://bibliotekanauki.pl/articles/2106442.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza numeryczna
silnik spalinowy
naprężenie
trwałość zmęczeniowa
numerical analysis
IC engine piston
geometrical shape
thermo-mechanical strength
stress intensity
fatigue life
Opis:
This research investigates a thermo-mechanical strength of three geometrical shape designs of an internal combustion (IC) engine piston by a finite element analysis (FEA). FEA was performed using Solidworks software for modelling geometrical piston designs, and the models were imported into ANSYS software for thermo-mechanical fatigue simulation. The work focused on predicting high stress intensity and indicated the fatigue critical regions and life of the piston shape design. AL7075-T6 aluminium alloy was used as a piston material and thermo-mechanical fatigue simulation was conducted based on the experimental stress-number of cycles recorded data from literature. Analytical results showed the similarity of the critical failure positions to some real failures in the IC engine piston, and the shape design modification of the piston. Hence, this concept can be used to satisfy the IC engine design needs at low cost.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 1--11
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of engine load on piston ring pack operation of an automotive IC engine
Autorzy:
Wolff, Andrzej
Koszałka, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2097662.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
automotive IC engine
piston rings
blowby
ring dynamics
hydrodynamic lubrication
mixed friction
silnik o spalaniu wewnętrznym
pierścienie tłokowe
przedmuchy spalin
dynamika pierścienia
smarowanie hydrodynamiczne
tarcie mieszane
Opis:
A piston-rings-cylinder (PRC) assembly determines the blowby, engine oil consumption, and friction and wear processes accompanying the system's operation. Thus, it is crucial for the whole IC engine efficiency and lifetime. A lot of research effort is put into increasing the performance of this complex and highly dynamic system. Advanced, comprehensive models play an important role in understanding and improving the PRC system. In the presented work, the effect of load on the operation of the ring pack of an automotive gasoline engine is analyzed. A comprehensive model that covers the gas flow through the crevices of the PRC system, ring displacements in the groove, and ring lubrication was used for this analysis. The results of the simulations show that the local thickness of the oil film, especially near the piston top dead center is compared to the height of the combined surface roughness of a cylinder liner and piston rings, and friction-related asperity contact strongly increases as the engine load increases. The simulations also show that the engine load affects the axial displacements of the rings in the grooves but practically does not affect the thickness of the oil film left by the ring pack on the cylinder liner.
Źródło:
Combustion Engines; 2022, 61, 3; 88--94
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Main conditions and effectiveness of gas fuel use for powering of dual fuel IC self-ignition engine
Podstawowe uwarunkowania oraz efektywność wykorzystania paliwa gazowego do napędu silnika spalinowego z zapłonem samoczynnym
Autorzy:
Postrzednik, S.
Przybyła, G.
Żmudka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/374539.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
IC engine
gas fuel use
self ignition
dual fuel system
performance parameters
gas fuel
silnik spalinowy
stosowanie paliwa gazowego
samozapłon
układ paliwowy podwójny
parametry wydajności
paliwo gazowe
Opis:
Internal combustion engines are fuelled mostly with liquid fuels (gasoline, diesel). Nowadays the gaseous fuels are applied as driving fuel of combustion engines. In case of spark ignition engines the liquid fuel (petrol) can be totally replaced by the gas fuels. This possibility in case of compression engines is essentially restricted through the higher self-ignition temperatures of the combustible gases in comparison to classical diesel oil. Solution if this problem can be achieved by using of the dual fuel system, where for ignition of the prepared fuel gas - air mixture a specified amount of the liquid fuel (diesel oil) should be additionally injected into the combustion chamber. For assurance that the combustion process proceeds without mistakes and completely, some basic conditions should be satisfied. In the frame of this work, three main aspects of this problem are taken into account: a. filling efficiency of the engine, b. stoichiometry of the combustion, c. performance of mechanical parameters (torque, power). A complex analysis of these conditions has been done and some achieved important results are presented in the paper.
Silniki spalinowe są zwykle zasilane paliwami ciekłymi (benzyna, ON). Aktualnie do napędu tych silników często wykorzystywane są paliwa gazowe, przy czym zazwyczaj stosowany jest zapłon iskrowy. W przypadku silników z zapłonem samoczynnym wymagane jest użycie podwójnego systemu paliwowego (tzw. systemu dualnego), w ramach którego łącznie z paliwem gazowym podawana jest nieduża dawka paliwa ciekłego, inicjująca zapłon przygotowanej gazowo-powietrznej mieszanki palnej. W celu zapewnienia, że proces spalania będzie przebiegać prawidłowo, a pracujący silnik osiągnie wymagany moment obrotowy (moc efektywną), wiele uwarunkowań powinno być ściśle dotrzymanych. W artykule przeprowadzono teoretyczno-obliczeniową analizę uwarunkowań związanych z prawidłowym funkcjonowaniem silnika spalinowego, wyposażonego w dwupaliwowy układ zasilania w aspekcie uwarunkowań stechiometrycznych oraz pozyskiwanego momentu obrotowego.
Źródło:
Transport Problems; 2015, 10, 3; 99-111
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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