Year: 2010
Type: article
Abstract: —Homogeneous charge compression ignition \n(HCCI) enginesuse a new mode of combustion. The new \nchallenges in developing HCCI engines arethe \ndifficultiesin: controlling the auto-ignition of the mixture \nand the heat release rate at high load operation, achieving \na cold start, meeting emission standards and controlling \nknock. At low engine speeds, early auto-ignition can occur, \npossibly leading to knocking, while late auto-ignition at \nhigh engine speeds will make HCCI susceptible to misfire. \nHydrogengreatly reduces emission levels but with reduced \npower. However, when it is combined with diesel in dual \nfuel mode, low NOx, CO and particulate matter emission \nlevels are achieved while increasing engine efficiency by \n13-16%. Numerical methods areused to predict HCCI \nengines’ performance, which is cost efficient compared \ntoexperimentation alone. The multi-zone method promises \nbetter simulation results by combining detailed chemical \nkineticswith simplified 3Dmodellingso that turbulence and \ninhomogeneity in the mixture are considered; good \nagreement between simulations and experiments has been \nachieved. Specific strategies used in the experimental and \nnumerical methods, and other issues associated withHCCI \nengines are discussed in this paper. \n
Language: English
Subfield: Fluid Flow and Transfer Processes
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1596563917