Performance and emission characteristics of HCCI Engine fueled with diesel and Ethanol Blend

Alternate fuels have been used to fulfill the demand of fuel for engines used at various fields and also due to the decreasing petroleum fuel resources. Moreover the very low emissions norms have led to the experimentation, analysis and optimization of operating parameters of the engines run with these alternate fuels. Optimization of operating parameters to suit these alternate fuels have led to various new combustion techniques and one of these is HCCI. HCCI technique is a promising combustion mode with high efficiency and low emissions of NO_x and PM. This experiment’s objective is to analyse the working of a single cylinder diesel engine under HCCI combustion mode using Ethanol, renewable fuel widely available from the agricultural wastes. The engine is run at its conventional mode and at HCCI mode with both Diesel HCCI and also Ethanol HCCI. The HCCI mode of engine operation involves different percentage HCCI as 10%, 20%, 30%, 40% and also 50% HCCI and observations carried out for the same . Ethanol with high octane number has higher volatility and hence tends to provide a much homogeneous mixture in HCCI mode improving BTE of the engine. Also the emissions using HCCI and Ethanol fuel are much lower as the ethanol fuel has no aromatic chain that causes soot formation and reduced NO_x emission. 50% Ethanol HCCI adaption provides the highest efficiency and also optimized emission like NO_x, HC and CO.