Research on two-dimensional combustion model for natural gas/diesel dual fuel engines

The development of more economic and efficient combustion methods are required due to the increasing cost of the lighter liquid fuels and the tightening of emission standards. The research on the natural gas/diesel dual fuel engines is increasing in importance. To improving the combustion process of the dual fuel engine, this paper presents a two dimensional combustion model for a dual fuel engine. Based on the Arbitrary Lagrangian Eulerian method, the behavior of the pilot fuel spray is simulated by discrete droplet model. The turbulence motion of gas is calculated by the numerical solution of the Naiver Stokes equations, supplemented with a k e model, and the combustion is simulated with many step kinetic mechanism. The simulation results are agreement with the experimental results fairly well. It is confirmed that the model is suitable to describe the combustion process of a dual fuel engine, and the model can denote the influence of parameters such as the quantity of pilot, the velocity of engine, etc. on the performance of engine. Thus the model will serve a valuable function in improving the economy, emission and output of the dual fuel engine.