Effect of the addition of hydrogen-containing (H2/O2) gas on indicated and effective parameters of a gasoline engine.

The article presents experimental research and calculations of spark ignition engine indicators, using hydrogen-containing H 2 /O 2 gas, when the engine is running at low power. The engine throttle was opened 8°, the amount of H 2 /O 2 gas was increased from 0 to 7.9 % of the mass of gasoline, the stoichiometric (λ = 1) air/fuel ratio was maintained. Research shows that the addition of the H 2 /O 2 gas leads a great influence on the energetic and ecologic indicators of the engine and this depends on the change in the combustion process and the change in the composition of the fuel. The calculation methodology of the combustion process when the engine is fuelled with pure gasoline and with additives of hydrogen-containing gas presented. Presented results how addition of H 2 /O 2 leads to a reduction in the duration of the combustion process and also has a significant effect on a faster rise of combustion pressure and temperature. Shorter combustion duration leads to a rise of the indicated efficiency of the engine, the heat utilisation factor and an increase in the indicated power. As a result of bench tests, an increase in the effective power and a decrease in the brake-specific fuel consumption of the engine were found. When assessing the influence of H 2 /O 2 on the concentration of CO 2 in the exhaust gas, no decreases was not observed, as hydrogen improves the combustion process. Only the concentration of incomplete combustion process products (e.g., HC) decreases, but the concentration of NO x increases at the same time. • Study of indicators of the engine operating at low power by changing the amount of H 2 /O 2 in a wide range. • Described method for calculating the indicated engine parameters, taking into account the addition of H 2 /O 2. • Determined indicators of the combustion process for the gasoline engine operating with the H2/O2 additive. • The addition of an H2/O2 (7.9% of mass) enhances heat usage efficiency and raises the indicated efficiency to 13.9%. • The H 2 /O 2 additive reduces BSFC but does not significantly affect the CO 2 emissions of the SI engine. [ABSTRACT FROM AUTHOR]