A Study of Flow Characteristics on the Diesel-Gasoline Dual-Fuel Combustion by 3-D CFD
Various advanced combustion concepts have been suggested as the emissions regulation gets stricter which can achieve higher thermal efficiency and emissions reduction. Dual-fuel combustion is one of the alternatives which is operated by using different fuels which has both premixed and non-premixed combustion characteristics. Therefore it is important to know the effect of air-fuel mixture distribution in dual-fuel combustion because it determines the ignition spot and following combustion phase. The fuel distribution in the engine is affected by various factors, such as chamber geometry, injection strategy or in-cylinder flow motion. Among them, in-cylinder motion is mostly affected by in-cylinder port geometry, in terms of swirl or tumble motion. In this paper, 3-dimensional Computational Fluid Dynamics (CFD) was used to investigate the effect of in-cylinder flow motion in dual-fuel combustion. Two head and port geometries were used in the simulations.