Wyniki wyszukiwania - BazTech

1

Thermodynamic cycles variability of TJI gas engine with different mixture preparation systems

Szwajca Filip, Wisłocki Krzysztof

Combustion Engines

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2020

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R. 59, nr 2

46--52

EN

Gas engines are a viable source of propulsion due to the ecological indicators of gas fuels and the large amount of the needed natural resources. Combustion of lean homogeneous gas mixtures allows achieving higher thermal efficiency values, which is a key factor in current engine development trends. Using the spark-jet ignition system (also called as Turbulent Jet Ignition or two-stage combustion) significantly improves the efficiency and stability of the combustion process, especially in the part-load operation on lean or very lean mixtures. This paper presents the impact of using two different fuel injection methods: Port Fuel Injection or mixer on the operation stability of a gas engine designed for LDVs. Comparative studies of two different mixture preparation systems were carried out on a single-cylinder AVL 5804 test engine. By recording the cylinder pressure for a significant number of engine cycles, it became possible to determine the repeatability of engine operation and to correlate the results with the mixture formation system and the air-fuel ratio. In the performed research the beneficial effect of the mixer system application on the engine operation stability in the part-load conditions was found.

2

The environmental safety of the Fiat 0.9 TwinAir compressed natural gas engine

Warianek Michał G., Lejda Kazimierz

Archiwum Motoryzacji

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2020

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Vol. 88, nr 2

47--60

EN

The article presents the results of measurements of concentrations of selected exhaust components of the Fiat 0.9 TwinAir spark ignition engine operating according to load characteristics. The tested engine has an indirect, multi-point petrol supply system and has been retrofitted with an indirect CNG injection system. The results of the tests are a comparison of selected economic, ecological and energetic indicators of engine operation obtained when fuelled with CNG and 95 octane petrol. The operation of the engine fuelled with gaseous fuel was preceded by autocalibration of the controller of the fuelling system. The article presents the results of tests of concentrations of harmful components of exhaust gases: carbon dioxide CO2 , carbon monoxide CO, nitrogen oxides NOx and HC hydrocarbons. Moreover, the values of lambda λ air excess coefficient are presented and fuel consumption is compared. The obtained results of the tests of the engine fuelled with CNG gas show a significant decrease in the value of the obtained torque in comparison to the engine torque when fuelled with petrol. The engine fuelled with compressed natural gas contributed to the improvement of its ecological properties and a reduction of fuel consumption, which are important factors of ecological and energy safety. Exhaust gas analysis showed a reduction in the concentration of harmful components of exhaust gases, mainly hydrocarbons and nitrogen oxides. A positive effect of the operation of the engine powered by CNG was also a significant reduction of carbon dioxide in the exhaust gases compared to the engine powered with gasoline.

3

The simulation of performance characteristics of port injection dedicated compressed natural gas spark ignition engine

Semin, Abu Bakar R., Ismail A.

Journal of KONES

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2008

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Vol. 15, No. 2

427-432

EN

This paper presents the computational modelling simulation results of port/sequential injection dedicated compressed natural gas (CNG) spark ignition engine to investigate and evaluate the engine performance while base engine converted by using compressed natural gas as an alternative fuel. The baseline engine in this research is four stroke direct injection diesel engine. The computational modelling design and development has performed using GT-Power software at Automotive Excellent Centre Laboratory, Faculty of Mechanical Engineering, University Malaysia Pahang, Malaysia. To investigate the engine performance, the engine computational model is operated between 500-4000 rpm, under steady state condition. In this research, the sequential injection dedicated compressed natural gas spark ignition engine performance investigation results such as torque, power, fuel consumption pressure and exhaust gas emissions were investigated and compared to base diesel engine performance. From the CNG engine computational modelling simulation results are shown that by development of sequential injection dedicated compressed natural gas spark ignition engine has a potential to reduce the engine emissions. Unfortunately, the development of sequential injection dedicated compressed natural gas spark ignition engine can be reducing the engine performance. However, the study of required to improve the performance of sequential injection dedicated compressed natural gas spark ignition engine has a potential of reducing engine.

4

Adaptacja konstrukcyjna ciągnika rolniczego C-385 do zasilania CNG

Cieślikowski B., Knapik P.

Inżynieria Rolnicza

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2007

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R. 11, nr 9 (97)

35-40

PL

Dążenie do obniżenia kosztów eksploatacji ciągników rolniczych skłania do procesu adaptacji silnika Diesla do zasilania sprężonym gazem ziemnym CNG. W publikacji przedstawiono wyniki prac zmierzających do modyfikacji ciągnika C-385 zasilanego w systemie jednopaliwowym. Proces adaptacji konstrukcyjnych zawiera modyfikację układu korbowego, rozrządu i układu dolotowego silnika wraz z montażem dodatkowego osprzętu układu CNG i butli na sprężonym gazem ziemnym. Istotnym zagadnieniem jest dostosowanie parametrów sterownika w układzie dozowania CNG do indywidualnych wymagań typoszeregu konstrukcyjnego silnika.

EN

The need to reduce operating costs of farm tractors incline engineers to make efforts to adapt Diesel engines to the combustion of compressed natural gas (CNG). The paper presents results of works aimed to modify the C-385 tractor working in a single-fuel system. The process of constructional adaptations includes modification of crankshaft assembly, timing gear system and engine inlet system, plus installation of extra CNG system elements and gas cylinder containing compressed natural gas. An important issue is to adjust controller parameters in the CNG proportioning system to individual requirements of the engine constructional series of types.