Özet:

In this study, a single cylinder homogeneous charge compression ignition engine with port injection system was used. By spraying reference n-heptane and tetrahydrofuran-n-heptane blends from the low pressure port injector, a homogeneous mixture was prepared during the intake and compression period. In-cylinder pressure, heat release rate, start of combustion, CA50, combustion duration, indicated thermal efficiency, maximum pressure rise rate analysis were done and hydrocarbon and carbon monoxide emissions were determined. In lean mixing conditions, the pressure and heat release rate in the cylinder decreased with all test fuels. The addition of tetrahydrofuran to the reference n-heptane fuel enabled the combustion processes to be controlled. The maximum indicated thermal efficiency was obtained as 38.14 % at 1.9 lambda with THF60 fuel. Addition of tetrahydrofuran to n-heptane fuel slowed down the combustion. Thus, low temperature combustion was completed in a longer period. Under extremely lean operating conditions, hydrocarbon and carbon monoxide emissions of n-heptane-tetrahydrofuran fuel mixtures increased compared to the reference fuel. The highest pollutant emissions have been achieved with THF60 fuel. Compared to the reference fuel, hydrocarbon and carbon monoxide increased by an average of 8.3 % and 54 %.

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