Numerical Simulation Of The Homogeneous Charge Compression Ignition With Ethanol

AS the developing of automobile industry, the number of car increases sharply, which brings big pressure to environment and energy sources. Every country made a more and more stricter regulation in the world. In order to release the pressure of energy source and fit the regulation, it must to find new combustion mean which is more efficiency and more clean and develop the alternative fuel.Homogeneous charge compression Ignition has become the key subject,as the hybrid of conventional spark ignition engine and compression ignition engine,it has the potential of very low emissions of oxides of nitrogen (NOx) , particulate matter (PM), as well as high thermal efficiency at part load. Paralleling with test study, computational study has get a number of results of combustion model, combustion mechanism and variable parameter study. Now ,the computational work gained more and more attention from the researcher.In this paper, CHEMKIN coupled with ethanol oxidation detail chemical dynamics model was used to simulation ethanol HCCI combustion. The work provided a insight to auto-ignition mechanism and the effects of boundary parameter on combustion.It also simulated the HCCI operation range as well as built a reduced chemical dynamic reaction model.The research results showed:1,By using the model of the sigle area ,the simulated pressure profile and auto-ignition timing both agreed with the test results well at different conditions.2,By using the model of ethanol HCCI combustion ,we studied the effect of the boundry condition on the HCCI combustion.Results said that with the temperature increasing and excess air factor deceasing, the intake pressure increasing ,combustiong timing advancing due to compress rate,combustion and heat release rate increasing ,top cylinder pressure inceased,top combustion temperature increased,NO emission increased. As EGR rate increased, combution timing delayed ,heat release rate reduced, the pressure and temperature droped. Among those facts,the content of CO2 is the most sensitive factor to affect the...