Parameter Optimization in a Turbocharged Engine Fuelled with Dimethyl Ether

Experimental study was conducted with a vehicular turbocharged diesel engine operated with neat dimethyl ether.On the basis of the measured engine power,torque,brake specific fuel consumption(BSFC) and emissions,the effects of fuel temperature and technical specifications of high pressure pump and nozzle on the performance and emissions of dimethyl ether engine were investigated.The results show that the engine power and torque decrease with the increase of dimethyl ether temperature.At the same engine load,using a smaller nozzle orifice,NO_x emission level is higher,and BSFC is lower.The high pressure pump of P8500 is more appropriate for the dimethyl ether engine because its pump body has a higher strength.Under the required engine power output,a good compromise for dimethyl ether fuel consumption and NO_x emissions can be obtained using P8500 pump with the plunger diameter of 12 mm and a injector of(6×0.43) mm.