Parametric study of intake manifold temperature on a HCCI combustion engine

International audienceHomogenous Charged Compression Ignition (HCCI) is one of the new combustion strategies developed recently for Internal Combustion (IC) engines to fulfill the stringent emissions regulations while it can keep the thermal efficiency of the engine as high as diesel engines. In this type of engines, the homogenous mixture of fuel and air is inducted to the cylinder and when the piston reached to the top dead center (TDC), the mixture will be ignited due to auto ignition of fuel and air mixture. In this study, a natural gas fueled HCCI engine is considered to study the effect of intake manifold temperature on engine outputs such as power and Indicated Mean Effective Pressure (IMEP), and Fuel Conversion Efficiency (FCE). On the other hand, exhaust characteristics such as pressure and temperature were reported as well as emissions such as carbon monoxide (CO) and oxides of nitrogen (NOx). The exhaust parameters can help to have a maximum efficiency from the engine considering a waste heat recovery system in the exhaust flow. The results showed that FCE is maximum when the intake temperature is minimum. Also, the power output reduced uniformly when the temperature increased. On the other hand, the amount of NOx production increased uniformly, at higher intake temperatures. Furthurmore, with increasing the intake temperature, the exhasut pressure and the exhasut temperature were reduced monotonically