Wang Xibin£¬Jiang Deming£¬Zhou Longbao£¬Pan Keyu
(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract£ºA turbulent combustion model was developed according to the combustion characteristics of the dimethyl(DME) engine.The model took into account the influence of turbulence on combustion by adding a coherent flamelet model(CFM) in the original chemical kinetic model to reflect the turbulence on combustion promotion. Numerical simulation indicates that at an engine condition DME spray has shorter tip penetration than diesel fuel and no wall impingement is observed. The upper edge of spray near the nozzle would ignite first for its appropriate fuel concentration and higher temperature. In diffusive combustion the combustion rate is slow and the combustion lasts long due to the slow rate of airª²fuel mixture formation. The results of numerical simulation are in good agreement with experiments.
Keywords£ºdimethyl ether£»turbulence£»coherent flamelet model
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