点火能量对两相爆震波形成影响的数值研究

Numerical Investigation on Effects of Ignition Energy on Two-phase Detonation Wave Formation

针对液态辛烷/空气两相混合物燃烧波在一维封闭空间内传播的爆燃向爆震转变(DDT)问题,运用化学反应流动基本理论、颗粒轨道模型和两步反应模型,在拉格朗日质量坐标系中建立了对该现象的数学模型,并开发了数值模拟程序CTPD。通过数值模拟研究了液态燃料爆震波的基本特性,以及点火能量及初始温度对于爆震波结构与发展的影响。研究发现,点火能量及初始温度的提高显著促进了爆震的转变,爆震强度随着点火能量的提高而增大,随着初始温度的提高而减小。

The mechanism of deflagration to detonation transition （DDT） of liquid octane/air mixture was studied by using theory of one-dimension reacting flow, particle-trajectory model and two-step reaction model, of which the numerical formulation was described and the code-CPTD was developed. Basic properties of liquid-fueled detonation structure together with the effects of ignition energy and initial temperature of detonable mixtures on detonation structure and development were investigated in our current study. Based on the results obtained numerically, it＇s found that the increase of both ignition energy and initial temperature of detonable mixture in the tube will significantly enhance transition to detonation. Detonation intensity rises with ignition energy, but decreases as initial temperature increases.