乙醇均质压燃燃烧过程的化学动力学数值模拟

为了全面分析醇类燃料均质压燃的燃烧过程,利用乙醇高温反应化学动力学机理,建立了乙醇HCCI燃烧模型,利用该模型计算了燃烧过程中各组分的变化情况。得出了如下结果:H2O2和HO2在压缩过程中随着温度的升高逐渐累积,它们的峰值都在着火点附近。OH基和H基浓度在着火时刻瞬间达到最大值,并且OH基的浓度远远高于H基。燃料大量燃烧放热之后,H基浓度快速下降到很低的水平,OH基的浓度也降低到很低的水平,但是其变化速度比较慢,在上止点40℃A之后才趋于稳定值。

Chemical kinetics simulation of ethanol HCCI combustion process

To study in detail the homogeneous charge compression ignition(HCCI) combustion process of the ethanol fuel,a chemical kinetics model was established for the ethanol combustion based on the ethanol high temperature reaction mechanism.The histories of the mole fractions of the different chemical species including reactants,intermediates and products were calculated with the model.The results show that the intermediate H_2O_2and the radical HO_2 are accumulating with temperature during the compression and reach their peak values near the ethanol ignition point.The radicals OH and H reach their peak values at the ignition point and the mole fraction of OH is much more higher than that of H.After intense exothermicity,both the mole fractions of H and OH fall down to a very low level,but the falling rate of OH is much less and reachs a steady value only after 40 ℃A ATDC.