Naslov
Influence of High Compression Ratio and Excess Air Ratio on Performance and Emissions of Natural Gas Fuelled SI Engine

Autori
Sremec, Mario ; Božić, Mladen ; Vučetić, Ante ; Kozarac, Darko

Izvornik
Thermal science (0354-9836) 22 (2018), 5; 931681, 13

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Methane, SI Engine, Compression ratio, Natural Gas, CNG

Sažetak
Compressed natural gas is in automotive industry recognized as one of the “cleanest” fossil fuels which can be used in internal combustion engines with a number of benefits. Since natural gas has much higher octane rating than gasoline it is expected that higher compression ratios can be used. The goal of the research is to determine the change of performance of spark ignited engine with the increase of compression ratio to values similar to compression ignited engine while keeping the exhaust emissions on the acceptable level and avoiding knock combustion. Measurements are performed at compression ratios 12, 16 and 18 at three different values of air excess ratio. Methane with known composition from a pressure cylinder is used instead of natural gas and the results are comprised of indicating results (in-cylinder and intake pressure in a crank angle space), emissions, temperatures and mass flows on various intake and exhaust positions. Analysis of results shows high influence of compression ratio and excess air ratio on combustion, performance and exhaust gas emissions.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo, Tehnologija prometa i transport

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