Studies on Homogeneous Charge Compression Ignition Engines

Abstract

Homogeneous charge compression ignition is an advanced alternative combustion concept to diesel engines with higher thermal efficiency along with Ultralow Oxides of nitrogen and Particulate matter emissions. In the present research work, the different modes of tests were performed on the engine. In the first mode, Diesel engine, No Turbocharge and No HCCI, In the second mode, Diesel engine, Turbocharge and No HCCI and in the Third mode, No Diesel engine, Turbocharge and HCCI and in final testing No Diesel engine, No Turbocharge and HCCI only. The performance results show that HCCI based engines working at different load conditions and improve the performance of the engine and increase combustion efficiency. In the second experiment, the HCCI has been obtained by introducing fuel flow in the air intake pipe in different proportions viz. 25%, 50% and 75% of total fuel. The performance results show that emissions of NOx have been significantly reduced with fuel induction in the suction pipe through the fuel consumption is little higher with the selected fuel injection options compared with the conventional injection method. Thermal efficiency is observed to be low with fuel injection at the intake pipe. HC and smoke emissions increases with load and the reduction in emissions of NOx are significant as73%, 76%, 73% with 25%, 50%, 75% proportions respectively. And the third experiment, Biodiesel is the most favorable alternative fuel for Fossil fuels. The Eucalyptus biodiesel is blended with Diesel. The percentages are 90% of Diesel and 10% of Eucalyptus oil. The performance results show that Eucalyptus biodiesel gives cleaner smoke and more transparent compared to Diesel and also fuel efficiency is observed to be lower with the HCCI engine. The emissions of NOx and PM are reduced with Eucalyptus oil blended with diesel. newline