Hasan AYDOĞAN, Abdullah ÖZÇELİK, Mustafa ACAROĞLU

The effects of walnut biodiesel- eurodiesel fuel mixtures on the performance and emissions of a diesel engine with common rail fuel system and their combustion characteristics

This study is intended to investigate the effects of biodiesel and eurodiesel mixtures, obtained from walnut oil by transesterification method, on engine performance in a four-stroke, four-cylinder, water-cooled with common rail fuel system. 7% biodiesel - 93% eurodiesel (B7), 10% biodiesel - 90% eurodiesel (B10) mixtures were prepared with the fuels obtained from the walnut oil by transesterification method. Later, B7, B10 and eurodiesel (B0) were used as a fuel in diesel engine. In the tests, the engine compression rates of the eurodiesel fuel and biodiesel mixtures were close to each other in all engine rpms. Looking at the average values in the results obtained, it is seen that the highest engine torque value is measured in the range of 2000 - 2500 rpm. Again, in eurodiesel use, the highest engine torque values were measured as 185 Nm. When B7 and B10 fuels were used at the same engine rpm, the engine torque was measured as 165 Nm. As the engine speed increased, it was observed that B7 fuel consumption values were the lowest and the eurodiesel values were the highest. In case of using biodiesel mixtures, it was observed that fuel consumption increased slightly checked to eurodiesel fuel.When the exhaust emission values were examined, it was seen that the CO emission value was 28% lower than Eurodiesel in B10 fuel, the highest value in CO2 emission was in B10 fuel, HC emission was in Eurodiesel fuel with an increase rate of more than 50% and the highest NOx value was in B10 fuel.In all cycles, the highest cylinder pressure values were obtained in eurodiesel fuel mixture. Maximum in-cylinder pressure value was obtained as 72 bar in Eurodiesel fuel at 2500 rpm. In the same cycle, 71 and 68 bar in-cylinder pressure values were obtained for B10 and B7 fuels. At 4000 rpm, in-cylinder pressure values were obtained as 80, 77 and 75 bar, respectively, for diesel fuel, B10 and B7 fuel mixtures.

Keywords:

Biodiesel, walnut oil eurodiesel, common rail, emissions,

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