View of the Article PDF: 4_Filipova, Yanovskyi, Fedorov
ISSN 2958-0757
© Galyna Filipova, PhD, Professor,
ORCID:0000-0003-3427-7633,
е-mail: galina_gaj@ukr.net;
© Vasyl Yanovsky, PhD, Associate Professor,
ORCID:0000-0001-9437-4537,
е-mail: yanovskyi_v@ukr.net;
© Volodymyr Fedorov, PhD, Associate Professor,
ORCID:0000-0002-1085-5112,
е-mail: fedorov.volodymyr@gmail.com;
(National Transport University)
TO ASSESS THE IMPACT OF COMPRESSION RATIO ON
GAS ENGINE PERFORMANCE
DOI: 10.33868/0365-8392-2025-4-285-24-27
Abstract. Natural gas is currently the most realistic substitute for liquid petroleum fuels. Its main advantages are large natural reserves, significantly lower emissions of pollutants, and high anti-knock properties. However, when operating on compressed natural gas, engine power is reduced by 15–20% due to the low energy density of the gas-air mixture and a decrease in the filling of the cylinders with air, which leads to a deterioration in the indicator and effective performance of the engine and, as a result, a deterioration in the traction and speed properties and performance of gas-powered vehicles. The high anti-knock properties of natural gas allow improving the indicator and effective performance of the engine when operating on natural gas by increasing the compression ratio. Experimental studies of the 8Ch100/95 engine with different values when operating on compressed natural gas in the entire range of speed and load modes were conducted, which showed an increase in maximum engine power and a decrease in fuel consumption with an increase in the compression ratio. The change was provided by the use of cylinder heads with different volumes of combustion chambers. The influence on the environmental performance of the engine of the optimal ignition advance angles, which differ significantly for different, was also analyzed. The obtained dependencies will allow further research into the influence on the performance of the gas engine. Such research is planned to be performed on a mathematical model of calculating the working process in the superpiston cavity of the cylinder.
Keywords: compressed natural gas, gas engine, compression ratio, energy performance, fuel consumption, exhaust gas toxicity.
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