Temat: Diesel engines - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Transestrification of biofuel, yes but why?
Autorzy:: Sitnik, L. J.
Powiązania:: https://bibliotekanauki.pl/articles/242003.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
diesel engines
fuels
alternative fuels
biofuel
Opis:: This paper presents a novel way of utilizing alcohols as fuels for a diesel engine. It is proposed to use heavy alcohols as a mix with vegetable oils and conventional diesel fuel. It is presented the another way to use alcohols. Namely, the use of heavy alcohols as a solvent for vegetable oil (named the biomix or BM) and after the obtainment of the thickness, which would be approximate to diesel fuel, mixing the biomix with diesel fuel to obtained biomix diesel (BMD). This solution will be shown for example with butanol as heavy alcohol, rape oil as vegetable oil and conventional diesel fuel. The investigations are carried out with a simple diesel engine on the engine test bed. Main parameters of engine (power output, torque, specifically fuel consumption) and the main exhaust gas component (in this case CO, NOx, PM) will be investigated. There were better results achieved than one expected. Opposed to existing experiences, the maximum of power output and the torque of engine are higher in the whole range of the rotatory speed of the engine crankshaft when the engine biomix diesel (BMD) is reinforced. The addition of the component biomix to fuel influences the specific fuel consumption. Generally with the larger part of the component biomix the specific fuel consumption grows. Because the power of engine also grows up one should expect that in exploitation the specific fuel consumption should not increase. Transestrification process in the proposed solution does not appear. This has large economic meaning. The investment amount (the transestrification plant) is not necessary. The power consumption to get fuel is lower. Vegetable oils are fully used (glycerine is not produced). BMD has stable parameters. The usage of existing infrastructure to this transportation is enough. Very important is that this fuel could be used to reinforce old, existing now and the future diesel engines. The production of butanol is known. It will be interesting to use for the production an electrolysis process, especially in the proposed new plant where the electrolysis process is connected with the process to get the electrical energy from byproducts of electrolysis (i.e. hydrogen and oxygen) in the fuel cell. It seems to be more efficient. The possibility to get butanol from ethanol gives a very good perspective for the use of ethanol from today's overproduction and moreover without the essential change of infrastructure.
Źródło:: Journal of KONES; 2008, 15, 4; 537-544
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modelling of alkalinity changes in lubricating oils used in marine diesel engines
Autorzy:: Młynarczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/242269.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
marine diesel engines
total base number
refilling process
Opis:: As the time is passing, lubricating oil in marine engine lubricating oil system loses its quality because of oil deterioration process. Lubricating oil quality influences the wear of tribological system elements. The total base number (TBN) is one of the most important oil quality properties. During operation of diesel engines the TBN decreases as alkaline additives are exhausted mainly through neutralization offuel burning acid products. So as to improve lubricating oil properties an engineer uses some maintenance methods. One of these methods is refilling process. The paper presents theoretical researches of total base number changes modelling at various lubricating oil refilling methods. Theoretical model of oil-deterioration process was worked out on the basis ofmass balance equation of total base number. The method of sofaing the problem, structural model of experimental unit, total base number change in case of constant refilling process, calculating example, total base number changes in PIELSTICK12PC2-5V engine oil versus parameter d, percentage changes of total base number in PIELSTICK 12PC2-5V engine oil versus parameter d are presented in the paper.
Źródło:: Journal of KONES; 2009, 16, 2; 329-335
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Speed irregularity characteristic of low speed, two-stroke marine diesel engine applied as vessels main propulsion
Autorzy:: Kowalak, P.
Powiązania:: https://bibliotekanauki.pl/articles/244760.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
marine diesel engines
combustion processes
speed measurement
speed irregularity
Opis:: The piston engine irregularity is a consequence of the uneven power supply from the engine units. As such, it contains valuable information about engines units working process. Unfortunately, it is strongly influenced by torsional vibration, resonance, and propeller behaviour. In order to better understand the speed irregularity phenomena the instantaneous speed was recorded and its characteristic against engine mean speed was developed. Some statistical parameters: standard error and deviation as well as variance were determined. The results were compared with propulsion plant torsional vibration. The presented results show that the irregularity of the long stroke engine's speed is strongly influenced by torsional vibration phenomena. The analyzed engine has a bared speed range 37-43 rpm. Exactly around that range, the speed irregularity reaches its maximum values of 18% of mean speed. The analysis can be considered as qualitative look into the phenomena. However even based on the presented analysis one can observe some practical inferences. The common type of electronic indicators is used to simplify the measurement by assuming that the shaft speed is equal in between the pickup pulses. In order to increase the accuracy of the indicated power determination the use of such instrument should be avoided in the speed range, which is a multiple number of the barred speed. Due to the fact that the shaft speed is irregular especially in the ranges where torsional resonance may occur the piston positioning (for example for TDC determination) purpose procedure should take it into account.
Źródło:: Journal of KONES; 2008, 15, 4; 263-268
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The dynamic TDC assigning on the marine four stroke engines indication diagram
Autorzy:: Kowalak, P.
Powiązania:: https://bibliotekanauki.pl/articles/243233.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
marine diesel engines
combustion processes
power estimation
determination of piston's TDC
Opis:: Determination of the internal combustion piston engine 's indicated power is a complex task. A number of difficulties lead to lots of solutions utilized to increase the accuracy of the result. This paper reports on the experiments concerned with a four stroke engine's piston dynamic position determination. Although the paper is mostly concerned with the piston's TDC definition, the experimental methodology can be utilized in the entire piston movement determination. A specially developed measuring assembly and its working principle utilized in the experiment have been presented too. It allows the acquiring of a set of time-position coordinates. Based on the coordinates, the mathematical algorithm for dynamic piston positioning can be developed. As the piston movement was being observed from the crankcase side, the methodology proved to be relatively cheap and easier for installation, compared to proximity sensors installed in the cylinder head. The advantage of optical sensors and light pipes being used was reduction of the explosion risk in oil mist environment inside the crank case.
Źródło:: Journal of KONES; 2007, 14, 2; 259-266
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Perspectives of applying of water-coal emulsion in heavy duty stationary diesel engines
Perspektywy zastosowania emulsji węglowo-wodnej w wyskoobciążonych stacjonarnych silnikach o zapłonie samoczynnym
Autorzy:: Mitianiec, W.
Powiązania:: https://bibliotekanauki.pl/articles/133268.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: transport
diesel engines
fuelling
water-coal emulsion
combustion
silnik Diesla
zasilanie
emulsja węglowo-wodna
spalanie
Opis:: Large deposits of coal and lignite in the world enable to utilize as fuel in different thermal machines, especially in internal combustion engines. A carbon powder containing small molecules about 5–10 micrometers dissolved in water is good fuel for applying in large capacity engines in electrical plants. Aqueous emulsion of coal has possibility of good cooling of injectors cooling and has also good lubricity. The paper gives necessary information about obtaining of water-coal emulsion, its physical properties and technical realization of fuelling system. Initial experimental tests indicate a higher thermal efficiency of engine fuelled by water coal emulsion than engine fuelled by diesel oil and also gas turbine driven by gas from coal gasification technology. The in-creased emission of CO₂ can be reduced in the plants simply by chemical reduction. The paper explains thermo-chemical processes taking place in the engines during combustion process. The work parameters results obtained from calculations were compared with those obtained from CI engine fuelled by diesel oil. The paper is a certain challenge for finding a new fuel sources as a competition for crude oil and allows to get acquainted with new engine fuelling technology.
Duże pokłady węgla kamiennego i brunatnego na świecie umożliwiają wykorzystanie jako paliwa w rozlicznych maszynach cieplnych, szczególnie w tłokowych silnikach spalinowych. Sproszkowany węgiel zawierający małe drobiny około 5–10 mikrometrów rozpuszczony w wodzie jest dobrym paliwem do zastosowania w silnikach Diesla o dużej pojemności w elektrowniach. Wodny roztwór węgla umożliwia dobre chłodzenie wtryskiwacza oraz wykazuje również dobrą smarność. Artykuł podaje niezbędne informacje o otrzymywaniu emulsji węglowo-wodnej, podaje jej właściwości fizyczne oraz techniczną realizację takiego systemu zasilania. Wstępne badania doświadczalne wykazały większą sprawność cieplną silników zasilanych taką emulsją niż silniki zasilane olejem napędowym oraz turbin gazowych zasilanych produktami zgazowywania węgla. Większa emisja CO₂ może być zredukowana w elektrowniach przez chemiczną redukcję albo sekwestrację. Artykuł wyjaśnia procesy termochemiczne występujące w procesie spalania takich silników. Parametry robocze silnika zasilanego emulsją węglowo-wodną otrzymane z symulacji zostały porównane z parametrami silnika zasilanego olejem napędowym. Artykuł jest próbą znalezienia nowego źródła paliwa jako konkurenta w stosunku do ropy naftowej i pozwala zaznajomić się nową techniką zasilania silnika spalinowego.
Źródło:: Combustion Engines; 2015, 54, 3; 744-751
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Combustion process of direct injected water-coal mixture in diesel engine
Autorzy:: Mitianiec, W.
Powiązania:: https://bibliotekanauki.pl/articles/134144.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: transport
diesel engines
fuelling
water-coal emulsion
combustion
silnik spalinowy
tankowanie
emulsja wodno-węglowa
spalania
Opis:: The paper describes the problem of coal-water mixture combustion process in heavy duty diesel engines in the energetic sector application. In the future due to depletion of crude oil resources we have to foreseen another fuel for application in power plants. Large deposits of coal and lignite in the world enable to utilize these fuels in different thermal machines, especially in internal combustion engines. A carbon powder containing small molecules about 10–20 micrometers dissolved in water is good fuel for applying in large capacity engines in electrical plants. Aqueous emulsion of coal has possibility of good cooling of injectors cooling and has also good lubricity. Initial experimental tests done in the world indicate a higher thermal efficiency of engine fuelled by water coal emulsion than engine fuelled by diesel oil and also gas turbine driven by gas from coal gasification technology. The increased emission of CO₂ can be reduced in the plants simply by chemical reduction. The paper explains thermochemical processes taking place in the engines during combustion process. The work parameters results obtained from calculations were compared with those obtained from CI engine fuelled by diesel oil. The paper is a certain challenge for finding a new fuel sources as a competition for crude oil and allows to get acquainted with new engine fuelling technology.
Źródło:: Combustion Engines; 2016, 55, 1; 37-43
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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