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为了能够预测二甲醚(DME)燃料缸内直喷燃烧及排放过程,基于该燃料气相喷雾雾化模型,推导出DME准维燃烧分区模型.通过气相射流模型对缸内情况进行分区,采用CHEMKIN库函数求解每个区化学反应速度.模型基于DME详细化学反应机理(包含79个物种、399步基元反应),采用DVODE算法对微分方程组进行求解,能够对DME着火过程进行模拟,并且能够对多种排放物(CO,NOx等)进行模拟预测.
In order to be able to predict the direct injection combustion and emission process of dimethyl ether (DME) fuel tanks, the DME quasi-dimensional combustion partition model was derived based on the fuel vapor phase atomization model.According to the gas jet model, Library function to solve the chemical reactions in each zone.Model Based on DME detailed chemical reaction mechanism (including 79 species and 399 steps), the DVODE algorithm was used to solve the differential equations to simulate the DME ignition process, A variety of emissions (CO, NOx, etc.) to simulate the forecast.