【摘要】 模拟了以小能量点火触发爆震的脉冲爆震发动机工作过程。采用有限速率化学反应模型,通过二阶迎风格式差分逼近二维欧拉方程,模拟以丙烷和空气为可爆混合物的脉冲爆震起爆和传播。采用CFD软件中spark ignition模型模拟实验中电火花塞点火。在模拟过程中可以清楚地观察到DDT过程。通过与CEA程序计算结果比较,发现两者C-J值误差小于4%,说明所采用的计算方法和网格生成方法可以用于小能量点火触发爆震的多循环数值模拟。更多还原

【Abstract】 Aim.The introduction of the full paper reviews Refs.3 through 6,points out what we believe to be their shortcomings,and then,proposes what we believe to be a better method of numerical simulation,which is explained in sections 1 and 2.Their core consists of:(1) a finite-rate chemistry CFD(computational fluid dynamics) model and second order upwind scheme were used in the 2-D simulation of gaseous mixture of propane and air detonation;(2) the spark ignition model in CFD software was used to simulate the spark plug ignition used in experiments.Section 3 is entitled numerical simulation results and their analysis;Figs.2 through 6 present the simulation results;the analysis of these results shows preliminarily that,compared with the results of CEA(Chemical Equilibrium and Applications)calculation code,the errors of C-J values were less than 4%,thus proving that the methods of mesh generation and calculation used in this paper can indeed be used in the simulation of multi-cycle detonation initiated by small energy ignition.更多还原