Effect of inlet charge temperature on a diesel-fuelled homogeneous charge compression ignition engine

In this work, experimental investigations were carried out on a diesel-fuelled homogeneous charge compression ignition (HCCI) engine with different inlet charge temperatures such as 80°C, 90°C, 100°C, 110°C and 120°C. Initially, the HCCI engine was operated under normal room temperature from no load to full load. Secondly, the HCCI engine was operated with different inlet charge temperatures and the effect of charge temperature on the HCCI engine output was analysed. In general, the HCCI engine has ultra-low NO_x and smoke emissions. From this study, it was observed that the level of NO_x emission increased with increasing inlet charge temperature within a certain limit and then reduced. However, smoke emission was reduced with increasing inlet charge temperature. The charge temperature of 100°C shows the maximum reduction of smoke emission is about 23 HSU. Similarly the exhaust emissions of CO and HC were reduced than the other charge temperatures. The specific fuel consumptions were increased with increasing charge temperature.