Study of Combustion and Emission Characteristic of Homogenous Charge Compression Ignition Engine Using Computational Fluid Dynamic

摘要

Numerical methods are used to predict HCCI engine performance, which is more cost-effective than experimentation alone. Specific strategies used numerical methods in HCCI an engine with three-dimensional modelling of combustion on 1 cylinder HCCI combustion engine fuelled by Diesel fuel is described in this paper. The 3 D model is performed on AVL Fire software. The combustion with basic parameters including different start time of Injections (SOI) with the same duration of combustion (BD), indicating pressure in chamber and emissions (Nitric Oxide and soot) were evaluate. The modelling results show that the highest value of pressure in the combustion chamber on the HCCI method was achieved at a pressure of 107 bar 360 deg CA, while in conventional combustion methods it was achieved at 72 bar 363 deg CA. On the other hand the highest peak heat transfer rate is 127 J / deg at 10 deg BTDC, whereas for conventional method occurs at 32 J / deg at 1deg ATDC. So there is a shift of heat transfer toward to BTDC before TDC, due to the already homogeneous fuel in the HCCI method. The combustion process in HCCI engines increases emissions with high NO emissions and reduces Soot emissions.