Abstract
The purpose of this study is to analyse the effect of premixed diesel fumigation on the performance and emission characteristics of Homogeneous Charge Combustion Ignition (HCCI) engine and to optimize the diesel fumigation temperature. An experimental investigation was carried out on a single cylinder, four stroke, water cooled, port injected Kirloskar SVI engine. An electric air heater is fixed at the suction pipe. During the experimental study, the diesel fuel was premixed by port injector and get vaporized or fumigated by heated suction air. After the process of heating and premixing, the diesel has changed its phase and mixed with the air in the form of partially homogenous mixture. During the test, the engine was operated at different diesel fumigation temperature of 100 C, 110 C, 120 C, 130 C, 140 C and 150 C to assess the performance and emissions characteristics of the engine. It is observed that the diesel fumigation has made the huge impact on NOx and smoke formation. The emission of NOx and smoke were decreased simultaneously about 10% and 16% compared to the compression ignition engine. Moreover, this engine has produced high amount of CO and HC emissions at low fumigation temperature and also reduced the high fumigation temperature. The suction air temperatures of 120ï‚°C and 130ï‚°C operated under HCCI engine were found to produce lesser NOx and smoke emissions. Moreover, the engine fuel consumption was increased due to the low volumetric efficiency and also slightly affected the brake thermal efficiency.
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