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

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