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

Abstract

The impacts of different fuel injection timings (base (15BTDC) and retarded (12BTDC)) on a single cylinder common rail direct injection (CRDI) compression ignition (CI) engine under dual fuel mode (DME-diesel) was examined at the maximum torque with the engine speed of 2200 rpm. The diesel (liquid) fuel was directly injected into the engine’s cylinder at the end of the compression stroke and Dimethyl ether (gas) fuel was injected into the intake system of the engine during the suction stroke. The maximum DME energy share (DME ES) with base injection timing (15BTDC) under controlled auto-ignition (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 (DME ES) without knocking is extended to 58% with delayed injection timing (12BTDC). Three stages of combustion (low-temperature region, high-temperature region and diffusion combustion region) were observed under DME-diesel mode. The low-temperature region (LTR) occurs at the temperature range from 700–900 K whereas high-temperature region (HTR) was at the temperature beyond 1000 K. The cyclic variations with the coefficient of variation (COV) of the important parameters (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.

Experimental Research With Diethyl Ether on Engine Performance and Emissions in a Spark Ignition Engine

“…They have also implied that imep decreased with the increase of DEE addition in the fuel mixtures. Rate of pressure rise rate decreased from 5.08 bar/ °CA to 3.1 bar/ °CA with diesel and optimum 52% DME ES (energy share) respectively in a dual fuel CRDI CI engine [31]. In the work of Ardebili et al, [30], engine torque decreased with DEE addition from 40% to 70% ratio.…”

“…Optimum response variables were determined as 11.80 Nm engine torque, 268 g/kWh BSFC, 1.365 COVimep [30]. Shere and Subramanian [31] investigated the effects of fuel injection timings with diesel/DME. Diesel injected into the cylinder where as DME was injected into the inlet line.…”

Effects of Thermal Barrier Coated Piston on Performance and Combustion Characteristics in Dual-Fuel Common-Rail Diesel Engine

“…where ma denotes air mass flow rate (kg/s). 𝜌a, vs, and N respectively symbolize density of air (kg/s), swept volume (m 3 ), and engine speed (min -1 ) [30].…”

Investigation of the Effect of TiO2 Nanoparticles on Engine Performance and Emission Characteristics in Diesel Engines

“…The International Energy Agency (IEA) states that developing countries' energy consumption will increase by 25% by 2040, which will trigger the formation of more greenhouse gases and the negative effects of climate change [5,9]. Global programs such as the Sustainable Development Goals (SDGs) also emphasize the urgency of transitioning to sustainable energy sources [10,11]. In addition to its negative effects, the depletion of fossil fuel resources has increased the search for alternative methods to use these resources more efficiently and reduce their negative effects [12][13][14][15].…”

“…Studies such as the use of biodiesel fuels, engine modifications, and the addition of fuel additives are examples of studies carried out to reduce the negative effects mentioned above and to use resources more efficiently [20][21][22]. In case studies using biodiesel fuel and nanoparticles, it has been shown that engine performance can be significantly increased, and harmful emissions can be reduced [23][24][25].…”