Abstract
The present study investigated the effect of supercharging in the operation of a small single cylinder DI diesel engine equipped with a conventional jerk type injection system. The experiments used three kinds of fuels: rapeseed oil methyl ester, soybean oil methyl ester, and JIS No.2 diesel fuel, and the boost pressure was from 100 to 140 kPa (absolute pressure) changed with a Roots blower. The influence of the boost pressures on the engine performance, combustion characteristics, and exhaust emissions were examined. The results showed that at high loads, the brake thermal efficiency increased with increasing boost pressures while the smoke and CO emissions decreased significantly. It was established that compared with ordinary diesel fuel, all of the investigated biodiesel emission characteristics other than the NOx emissions were superior.
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