某新型发动机燃烧性能影响因素的数值模拟

Namerical Simulation on Factors Affecting Ignition Characteristics of A New Engine

运用化学反应流动基本理论、粒状物轨道模型和分步反应模型及计算机编程技术,就液态辛烷/空气混合物燃烧波在一维封闭空间内传播的DDT问题开发了数值模拟程序,并用其研究了液态燃料爆震波点火能量及初始温度对于爆震波结构与发展的影响。结果表明,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。将模拟结果与实验结果进行了比较,说明本方法是可行的。

The mechanism of deflagration to detonation transition （DDT） of liquid octane/air mixture in an onedimention sealed space was studied and a model program was developed by using theory of one-dimension reacting flow, particle-trajectory model dual-step reaction model and computer-programming technology, The effec.t of detonation wave ignition energy and initial temperature of liquid power on the structure and development of detonation wave was studied. The results show that the detonation intensity rises with ignition energy but decreases as initial temperature increases. The numerical results are in good agreement with experimental ones, indicating that the method and program developed is feasible.