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In this study, an evaporative premixed constant-volume combustion system was designed for combustion of liquid fuels, compared with a traditional constant-volume firebomb. The effects of an alternative fuel of gasoline on the combustion characteristics of the laminar flame of gasoline were analyzed, and then a bench test was carried out. The results show that the addition of an alternative fuel of gasoline makes the maximum non-stretched flame propagation velocity of combusting gasoline increasingly close to that of combusting diluted mixed gas. The Markstein lengths of gasoline and “gasoline + alternative fuel” become shorter with a higher equivalence ratio, and flame combustion becomes increasingly unstable. The laminar combustion velocity of “gasoline + alternative fuel” rises first and then declines as the equivalence ratio increases. According to the results of the bench test, adding 20% of the alternative fuel into gasoline will exert little impact on the power performance and fuel consumption of the engine, but it will reduce HC emission by 25% and CO emission by 67%.

Combustion characteristics of and bench test on a mixture of gasoline and alternative fuel