The impact of intake temperature on air assisted fuel injection HCCI engine

HCCI combustion is one of the combustion strategy that can help to suppress the emission of NOx and soot in diesel engine. Among the challenges faced are the homogenous mixture preparation, combustion phase and auto ignition control and limited working range. The low volatility of the diesel is one of the hurdle in preparing a homogenous mixture for auto ignition of HCCI engine. The experimental work focus on the impact of intake air temperature on the performance, combustion behavior and emission on HCCI mode. Air assisted injector of 5 bar with port fuel injection method was used on a single cylinder 4 stroke diesel engine. The intake air was heated at different temperatures of 450C,500C,550C and 600C. Highest BTE was recorded by intake temperature 600C with maximum efficiency of 22.3% at 20% load. Highest fuel efficiency also was showed by intake temperature 600C.The working range for intake temperature 600C is limited to 20% as beyond that load knocking occurred during combustion. Higher intake temperature increase ignition timing and in-cylinder pressure which contributed the knocking issue. Lowest emission of HC was also observed via intake temperature 600C. Intake temperature 450C contributed the lowest NOx with value ranging from 8 to 14 ppm but recorded the highest CO with values from 0.18 to 0.41% .

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