engleski

Influence of compression ratio on performance and emissions of natural gas fuelled SI engine

Recent research of world energy consumption shows that transport is the main source of harmful exhaust gas emissions. Because of the environmental concerns, automotive industry is exploring alternative, more acceptable fuels. Compressed natural gas is one of the “cleanest” fossil fuel and can be used both in spark ignited and compression ignited 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 engine with the increase of compression ratio while keeping the exhaust emissions on the acceptable level and avoiding knock combustion. 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.

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

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