稳定传播火焰在可燃气云中产生的冲击波

忽略点火及火焰的初期加速，本文讨论了稳定传播火焰在可燃气云中产生的冲击波．引入约化变量，用自适应步长的四阶Ｒｕｎｇｅ－Ｋｕｔｔａ法对得到的自相似流场控制方程积分，得到了冲击波后流场的解；由火焰面两边的能量守恒确定了火焰面位置、燃烧速度及Ｃ－Ｊ条件下的对应值；以自相似解为初始条件，分别用ＭａｃＣｏｒｍａｃｋ格式与ＴＶＤ格式计算燃烧过程结束后的流场分布，结果表明：在弱冲击波条件下，ＭａｃＣｏｒｍａｃｋ格式计算得到的冲击波分辨率较高．

Blast Waves Generated by Steady Flames Propagating in a Combustible Cloud

By neglect of ignition and initial flame acceleration,the blast waves generated by steadyflame in a combustible cloud are discussed.Two reduced parameters are introduced and self-adaptive 4th order Runge-Kutta approach are used to integrate the conservative eqeations,and,the flow field solution is obtained.The flame postion,combustion speed and those corresponding to C-J condition are determined by the energy relation across the flame front.Using self-similar solution as an initial condition,MacCormack scheme and TVD scheme are used to calculate the flow parameters after combustion is finished.The results show that MacCoramck scheme is more adaptive with high resolution under wed shock conditions.