Temat: combustion engines - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Wpływ rodzaju aktywatora paliwa na skład chemiczny spalin emitowanych przez samochodowe silniki spalinowe
Influence of the kind of automotive fuel activators on the chemical composition emited by combustion engines
Autorzy:: Gustof, P.
Wieczorek, A.
Tematy:: samochodowe silniki spalinowe
spaliny
silniki spalinowe
combustion engines
car combustion engines
combustion; Pokaż więcej
Wydawca:: Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Powiązania:: https://bibliotekanauki.pl/articles/270425.pdf Link otwiera się w nowym oknie
Opis:: W niniejszej pracy przedstawiono doświadczalne wyniki analizy spalin silników benzynowych o zasilaniu gaźnikowym Renault 19 Chamade 1.4 i wtryskowym Volkswagen Polo 6N 1.4 eksploatowanych w układach: bez aktywatora paliwa, z trójpolowym aktywatorem paliwa Power oraz z jednopolowymi aktywatorami paliwa Dynamic Fuel GTM i Dynamic Fuel Reference. Wykazały one dwie różne zależności. Dla przypadku silnika gaźnikowego Renault 19 Chamade 1.4 stwierdzono wzrost emisji toksycznych gazów, natomiast dla przypadku silnika wtryskowego Volkswagena Polo 6N 1.4 zaobserwowano spadek zawartości szkodliwych gazów. W przypadku tego drugiego silnika, najkorzystniejszymi własnościami w zakresie zmniejszenia toksyczności spalin wykazał się jednopolowy aktywator paliwa Dynamic Fuel Reference.
At present work the experimental analyses of combustion products gasoline engines about carburettor admission Renault 19 Chamade 1.4 and injection Volkswagen Polo 6N 1.4 worked in configuration: without fuel activator, with three magnetic fields Power and one magnetic fields activators Dynamic Fuel GTM and Dynamic Fuel Reference was introduced. Different dependences were demonstrated. For carburattor engine Renault 19 Chamade 1.4 was affirmed the increase of release of toxic gases, however for case the injection's engine Volkswagen Polo 6N 1.4 was observed the decrease of content of harmful combustion products. In case of the second engine the most advantageous properties in range of decrease of toxicity of combustion products the fuel activator Dynamic Fuel Reference was displayed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The influence of the size and shape of the “central body” of a combustion chamber on the toxicity of the exhaust gases in the Ursus 4390 engine
Autorzy:: Kalina, P.
Tematy:: combustion engines
toxicity
combustion chamber; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246739.pdf Link otwiera się w nowym oknie
Opis:: This work is the third part of the articles published on the effects of the shape and position of the combustion chamber in piston compression diesel engines on the toxicity of exhaust gases. In two previous articles presented at the KONES 2015 conference, the impact of position of the combustion chamber in relation to position of the injector, and the influence of the shape of the chamber (diameter, depth, lip on the CO, HC and NOx emissions was analysed. In the current article, the shape of the “central body” in a combustion chamber is analysed. “Central body” is the protrusion located in the central part of a toroidal combustion chamber. Subsequent modifications to the basic combustion chamber consisted of reducing the size of this protrusion. The study involved four versions of combustion chambers. Modifications caused a slight decrease in the compression ratio, which could have an impact on the unambiguousness of the results, as the effect of changes in shape of the “central body”. However, to maintain a constant compression ratio would require a change in diameter or depth of the chamber cavity, which would obscure the obtained results with even greater impact. Emission tests in discussed study were performed according to ECE-R4. During the tests, the completion of the engine and the engine settings were not changed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of thermal loads in air cooled SI engine
Autorzy:: Mitianiec, W.
Buczek, K.
Tematy:: combustion engines
heat transfer; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246432.pdf Link otwiera się w nowym oknie
Opis:: In the spark ignition engines with air cooling system the thermal loads of the cylinders and cylinder heads are much bigger than in the water-cooled engines and the loads are not uniform on the whole surface of these elements. Recently most of the cylinders and cylinder heads of the two-wheel vehicles had long ribs that caused a bigger noise and an increase of the mass of the elements. The paper includes the modelling process of the thermal loads and temperature distribution of the cylinder and cylinder head of the two-stroke engine 115 cm3 capacity cooled by air at mean engine load. The results of simulation carried out in ANSYS program with creation of the mesh in CATIA were verified by the experiment on the real engine. The results obtained in the tests and the simulation show, that long ribs have not an effect on the decrease of thermal loads of the cooling elements. The paper includes the colour graphs with deviation of the parts, temperature on the surfaces and thermal stresses. Maun work results allow finding that the cooling heat in the air-cooled two-stroke engine increases with the engine speed and cooling energy, boundary condition enables determine the convection coefficient for heat exchange calculations and FEM enables the prediction of the surface temperatures of the walls, the accuracy of temperature depends on the determination of the outflow temperature of the air.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Controlling of the work of the high charged SI engines with direct injection of compressed natural gas
Autorzy:: Mitianiec, W.
Zioło, T.
Kula, M.
Tematy:: combustion engines
CNG
turbocharging; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244340.pdf Link otwiera się w nowym oknie
Opis:: In the future many of spark ignition engines will be fuelled by the direct injection of the compressed natural gas. The spark ignition engines fuelled by CNG with lean and stratified charge in a low load mode require much more controlling of the air-fuel ratio than the diesel engines. The paper describes the total problems of the charging of SI engines particularly with direct injection of CNG. The control of the delivered mass of the fuel and the air in order to obtain the required mixture composition is given in mathematical way. The total control system of the engine with turbocharger, the CNG injection system and the model of gas flow in the exhaust and inlet ducts are shown in diagrams with wide work explanation. The paper concerns to the important problems of fuelling of "downsizing "new SI engines in order to fulfil the future exhaust emission requirements. The publication bases partially on the work which was done in the European project. The work was the first approach in order to determine the non-stationary work of the turbocharger in spark ignition engine. Main conclusions of the work are: the pneumatic actuator in the waste-gate system is not suitable in the turbocharged spark ignition engines with direct CNG injection, the pressure and temperature before the turbine and in the inlet pipes fluctuates with not equal values of oscillations, the work was the first approach in order to determine the non-stationary work of the turbocharger in spark ignition engine.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Turbocharging of naturally aspirated spark ignition engine without modification of a compression ratio
Autorzy:: Sendyka, B.
Filipczyk, J.
Noga, M.
Kula, M.
Tematy:: transport
combustion engines
turbocharging; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246348.pdf Link otwiera się w nowym oknie
Opis:: The objective of research was to determine total efficiency and performance of turbocharged small displacement SI engine without modifying engine control unit. The engine used during the investigation was Toyota yaris 1296 cm3 displacement SI engine with modified intake manifold. There was variable and fixed geometry turbocharger mounted in the exhaust system. Inlet air pressure was controlled by introducing a waste gate valve. Specific values of maximum boost pressure were obtained thanks to implementation of different valve springs. The outcome of investigation shows that there is a possibility of introducing turbocharger without modification of intake system and engine's control unit. Implementation of turbocharger with variable turbine geometry and waste gate valve controlling maximum boost pressure permits significant improvement in torque characteristic without exceeding permissible harmful exhaust gases emissions. Change of waste gate valve spring's characteristic allowed reaching higher torque and making its value constant in wide range of engine's rotational speed. Change of waste gate characteristic permitted to achieve advantageous torque characteristic, maximum torque rise and its constant value in wide range of engine's speed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Formation of fuel mixture in a SI two-stroke engine with direct fuel injection
Autorzy:: Mitianiec, W.
Forma, M.
Tematy:: combustion engines
crank drive; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243963.pdf Link otwiera się w nowym oknie
Opis:: Decreasing of fuel consumption and high hydrocarbon emission in a SI two-stroke engine applied in motorcycles, scooters and small power units is possible by change of fuelling system on direct fuel injection. The main problem of mixture formation is short time for fuel evaporation after injection which should begin after closing of the exhaust port. However well interaction between the scavenge air and fuel jet from the injector located in the cylinder head can induce the small size of fuel droplets and fast evaporation. The paper presents the computational results of fuel mixture formation and combustion process in direct fuel injection two-stroke engine Robin EC-12 with capacity 115 cm3. The simulation was carried out by use KIVA code with assumption of initial parameters from the experiment of the carbureted engine. Earlier fuel injection influences on better evaporation and mixture formation with small stratification, which enables full mixture combustion. The paper shows phases of mixture formation, combustion and concentration of the combustion product in the cylinder. Spray guided high pressure direct injection system in SI two-stroke engine enables fulfill the restrictions of gas emission of one-wheeler vehicles and small power units. New modern two-stroke engines and environmental protection require new fuelling systems and one of the most promising methods is direct spray guided fuel injection. Many work were done in this subject, however still there is no better option for small power two-stroke engines.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Some effects of applying a new type of pistons for SU12-U diesel engine
Autorzy:: Jankowski, A.
Tematy:: internal combustion engines
compression ignition engines
exhaust emissions
combustion engine piston
piston materials
testing of combustion engines; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246313.pdf Link otwiera się w nowym oknie
Opis:: In the task of research and development of internal combustion engines, the strong emphasis is placed on reducing emissions of harmful substances in exhaust gases, which include carbon monoxide (CO), unburned hydrocarbons (HC), nitrogen oxides (NOx), particulate matter (PM, PN); while maintaining a high engine performance and, above all, adequate: power, fuel consumption, noise. One of the possibilities to reduce emissions of HC and engine working noise is to reduce the clearance between the piston and the cylinder liner. This is possible only, when the permanent deformations of the piston are reduced, which result from rapid piston temperature changes (thermal shocks). The newly developed composite aluminum alloy is characterized by high strength parameters and low dimensional hysteresis during repeated heating and cooling. The S12-U engine pistons are made of this material, and they had a slightly larger nominal diameter than the standard pistons. They were then mounted in the engine. The engine was tested on a test stand with the modern, accurate measuring equipment. Test results show, that the HC and CO content in the exhaust gas has been reduced, exhaust gas blowby to the crankcase declined, smoke emission was reduced and engine lubricating oil consumption was also reduced. Analysis of test results indicates that this has been achieved, mainly by reducing the clearances between the piston and the cylinder. The article provides detailed test results, mainly in the form of charts, on which one can compare the results, achieved by the engine with new material pistons with results of the same engine, but with the standard pistons.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Heat release characteristics in combustion chamber of CI engine
Autorzy:: Jankowski, A.
Lagowski, P.
Slezak, M.
Tematy:: internal combustion engines
diesel engines
combustion processes
heat release; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244001.pdf Link otwiera się w nowym oknie
Opis:: On the basis of the internal heat balance of CI engine with direct fuel injection, the quantity of heat transported during the combustion process from the combustion zone was determined. The real indicator diagrams are the bases for determination of the heat release Characteristics during the combustion process and making up of the internal heat balance. These diagrams were worked out for the engine fuelled with diesel oil for three sets of the injection timing and for work of the engine according to the full load engine Characteristics, and the load Characteristics taken at the engine speedb for the maximum engine torque. Tests with the three different injection timing were carried out. Tests with the load characteristics of the compression-igniting engine for five values of the power were carried out. The pressure in the cylinder of the engine during combustion process was recorded by means of liąuid cooled a piezo-electric quartz sensor with a load amplifier. Characteristics of heat release depended on the composition, temperature and the mol quantity of the working charge in the cylinder during the combustion process. Characteristics of the heat release were determined with the use of the novel calculation program. The program was worked out by authors at the assumption that the process of complete combustion was finished at the moment of the opening of the engine exhaust valve. For purpose of simplification calculation of the quantity of heat lost into the cooling system, the radiation, dissociation and incomplete combustion, were assumed to change during the combustion process in a linear way.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The coherence method of technical state evaluation combustion engine
Autorzy:: Kałaczyński, T.
Tematy:: combustion engines
coherence function
vibrodiagnostics; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246199.pdf Link otwiera się w nowym oknie
Opis:: The actual tendency to develop methods end techniques to diagnostic vehicles is making grow the interes f and the demand of the technical state analysis in exploration conditions, besides to systems, machines and devices more and more complex. The problem whit design and exploitation of modern machines and technical devices is to recognize the technical state in operational conditions [1-4]. To define the correct dynamic model and choose the best research method is the question of industry field, and the present paper has an approach about this topic. The coherence function which is the local measure of the similarity processes has, so the essential diagnostic properties in the reference to the objects which carry I will name linear and stationary in the field of the dynamic time. Yet the larger possibilities of uses of the diagnostic coherence functions can to find in mechanical arrangements non-stationaty or non-linear. The present methods of the diagnosing the condition of the folded objects combustion engines are which, are based on the measurements of the value steering currents. The vibrodiagnostic of combustion engines is the using analysis vibration processes generated in combustion engines the alternative method. Vibrodiagnostic enabling the opinion of the engine condition using the sensibility estimate the vibration process [l, 7-10]. The estimation of the combustion engine condition with sparkle ignition for the help of the research of vibration measures is possible thanks to utilization to the property of the coherence function [5, 6J. The implementation of software for needs: the acquisition of vibration processes, their processing, statistical inference and visualization - facilitates the leadership of investigations and the study of results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Comparative study of charging system of spark ignition engine
Autorzy:: Sendyka, B.
Filipczyk, J.
Noga, M.
Rodak, Ł.
Tematy:: transport
combustion engines
charging system; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246350.pdf Link otwiera się w nowym oknie
Opis:: The purpose of investigation was comparison of engine's output while equipped with different types of turbocharging systems. Engine used during research was Toyota's SI engine with displacement of 1296 cm3. Intake and exhaust manifold were modified by introducing fixed and variable geometry turbocharger. The third system was electrically driven charger ensuring both constant and variable boost pressure. Regulatory parameters of fuel injection and ignition system weren't changed. On the basis of carried out research , it was affirmed that there is a possibility of introducing charging system into the engine without changes of mentioned regulatory parameters. Proper choice concerning charging systems allows improving torque characteristic in wide range of engine's rotational speed. Electrically driven charger giving maximum boost pressure provides significant improvement in low engine's speed range, whereas in higher range it is not showing so much advantage. In medium engine's speed range the best result is given by variable geometry turbocharging system. In this application boost pressure had to be reduced to 0.25105 [Pa] in order to provide stable engine's run in all conditions including variable engine's speed and whole range of throttle opening angle.
Dostawca treści:: Biblioteka Nauki

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