Abstract
In this research an assist-injector was newly developed to improve the CO, THC and smoke emissions from a marine diesel engine fueled with vegetable oil. The effect of pre-injection and after-injection on the combustion characteristics and the exhaust emissions were investigated by engine test bench experiments. Results show that the assist-injector is effective for CO, THC and smoke emissions reduction. The reduction efficiency of CO, THC and smoke is about 30% with after-injection, and is over 50% with pre-injection.
