Numerical Investigation of Diesel-Spray-Orientated Piston Bowls on Natural Gas and Diesel Dual Fuel Combustion Engine
Low combustion efficiency and high hydrocarbon emissions at low load are key issues of natural gas and diesel dual fuel engines. For better engine performance, two diesel-spray-orientated (DSO) bowls were developed based on the existing diesel injector of a heavy-duty diesel engine with the purpose of placing more combustible natural gas/air mixture around the diesel spray jets. A bulge-ring was designed at the rim of the piston bowl to enhance the in-cylinder flame propagation. Numerical simulations were conducted for a whole engine cycle by using STAR-CD 4.22 at engine speed of 1200 r/min and indicated mean effective pressure (IMEP) of 0.6 MPa. ECFM-3Z combustion model with built-in soot emissions model was employed. In this paper, natural gas was considered as a mixture of 95% methane and 5% ethanol. Simulation results of the original piston bowl agreed well with the experimental data, including in-cylinder pressure and heat released rate, as well as soot and methane emissions.