Abstract
A numerical investigation was carried out to study on the combustion and emission characteristics of dimethyl ether (DME) with wide ranges of injection timings in compression ignition engines. In order to simulate DME combustion processes, a KIVA-3V code coupled with a chemistry solver was used to solve the detailed chemical kinetics model of DME oxidation. In addition, the Kelvin-Helmholtz-Rayleigh-Taylor (KH-RT) hybrid breakup model and Renormalization Group (RNG) k-e models were applied to analyze the spray characteristics and turbulent flow, respectively. To predict the NOx formation during DME combustion, a reduced Gas Research Institute (GRI) NO mechanism was used. From these results on the combustion and emission, the calculated results were compared with experimental ones for the same operating conditions. In the combustion characteristics, the calculated combustion pressure and heat release rates agreed well with experimental results. The levels of experimental NOx emissions was reduced as the start of the injection timing retarded, and also these trends appeared in calculated emission characteristics. Additionally, the calculated CO and HC emissions show an increasing trend as the start of the injection is retarded.
Highlights
Dimethyl ether (DME) is a promising alternative fuel for conventional diesel engines due to significant advantages compared to diesel fuel and it is known as an environmentally friendly energy source
Simulations using the KIVA-3V code coupled with detailed chemical kinetics on the combustion and emissions for a Dimethyl Ether (DME) fueled direct injection diesel engine were conducted by Elkelawy et al (2008) and Zhang et al (2007)
The calculated combustion and emissions characteristics in a diesel engine fueled with DME fuel are validated by experimental results obtained at 50 MPa injection pressure, BTDC 10 degree injection timing, and an 8 mg injection mass
Summary
Dimethyl ether (DME) is a promising alternative fuel for conventional diesel engines due to significant advantages compared to diesel fuel and it is known as an environmentally friendly energy source. Simulations using the KIVA-3V code coupled with detailed chemical kinetics on the combustion and emissions for a DME fueled direct injection diesel engine were conducted by Elkelawy et al (2008) and Zhang et al (2007) These groups reported that the DME combustion process includes the two stage heat releases at high and low temperature stages. The investigations on the modeling of the combustion and emission characteristics of DME fuel for a range of starts of the injection timing in a single cylinder diesel engine with high-pressure injection system were conducted by using the KIVA-3V code coupled with a detailed DME oxidation mechanism The calculated results, such as combustion pressure, heat release rate, and exhaust emissions were compared to experimental results under various injection timings. Hyung Jun Kim et al / Numerical and Experimental Study on the Combustion and Emission Characteristics of a Dimethyl Ether (DME) Fueled Compression Ignition Engine
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