Experimental Investigation on Effects of Fuel Injection Timings on Dimethyl Ether (DME) Energy Share Improvement and Emission Reduction in a Dual-Fuel CRDI Compression Ignition Engine

Authors : Anilkumar SHERE, K A SUBRAMANİAN

Pages : 98-112

Doi:10.30939/ijastech..999261

View : 18 | Download : 11

Publication Date : 2022-06-30

Article Type : Research Paper

Abstract :The impacts of different fuel injection timings insert ignore into journalissuearticles values(base insert ignore into journalissuearticles values(15BTDC); and retarded insert ignore into journalissuearticles values(12BTDC);); on a single cylinder common rail direct injection insert ignore into journalissuearticles values(CRDI); compression ignition insert ignore into journalissuearticles values(CI); engine under dual fuel mode insert ignore into journalissuearticles values(DME-diesel); was examined at the maximum torque with the engine speed of 2200 rpm. The diesel insert ignore into journalissuearticles values(liquid); fuel was directly injected into the engine’s cylinder at the end of the compression stroke and Dimethyl ether insert ignore into journalissuearticles values(gas); fuel was injected into the intake system of the engine during the suction stroke. The maximum DME energy share insert ignore into journalissuearticles values(DME ES); with base injection timing insert ignore into journalissuearticles values(15BTDC); under controlled auto-ignition insert ignore into journalissuearticles values(CAI); is limited to 52%. Delayed injection timing prevents knock occurrence to a certain extent due to the lower peak combustion pressure and temperature. The DME energy share insert ignore into journalissuearticles values(DME ES); without knocking is extended to 58% with delayed injection timing insert ignore into journalissuearticles values(12BTDC);. Three stages of combustion insert ignore into journalissuearticles values(low-temperature region, high-temperature region and diffusion combustion region); were observed under DME-diesel mode. The low-temperature region insert ignore into journalissuearticles values(LTR); occurs at the temperature range from 700–900 K whereas high-temperature region insert ignore into journalissuearticles values(HTR); was at the temperature beyond 1000 K. The cyclic variations with the coefficient of variation insert ignore into journalissuearticles values(COV); of the important parameters insert ignore into journalissuearticles values(peak in-cylinder pressure, peak rate of pressure rise and indicated mean effective pressure); were analyzed. NOx emission decreased along with zero smoke emission. However, the other emissions such as CO, HC increased marginally with retarded timing. The notable point emerged from this study is that the retarded injection timing is a promising strategy for enhancement of DME energy share with reduced emissions.
Keywords : CRDI engine, Controlled auto ignition, Dimethyl Ether, DME Energy Share, Knocking, Retarded Injection Timing