低速定态传播火焰在可燃云雾中形成的压力波

Pressure Waves Generated by Low Steady Speed Flames Traveling in Combustible Clouds.

对低于Ｃ－Ｊ燃速以恒定速度传播的火焰产生的压力波直接用数值方法求解有困难。忽略云雾的两相作用、点火过程及火焰加速，仅考察火焰达到定态传播速度，则火焰与压力波阵面之间的流场是等熵的，用自相似方法求解。能量释放看作在火焰面后瞬时完成。用自适应步长的四阶Ｒｕｎｇｅ－Ｋｕｔｔａ法对得到的控制方程求解，求出流场的参数分布与火焰面位置。燃烧过程结束时，火焰面到云雾中心之间流场用Ｓｅｄｏｖ结果连接，用ＭａｃＣｏｒｍａｃｋ格式计算此后的流场分布。

It's difficult to do numerical simulation to solve pressure waves generated by steady flames whose speeds are less than corresponding C-J deflagration speeds. Flow field between pressure wave and flame front is isentropic and Can he solved by selfsimilar approach if phase effect,ignition and flame acceleration are neglected.It is considered that energy is released instantaneously just behind flame front.When 4th-order Runge-Kutta approach was used to integrate the simplified control equations,flow parameters and flame po sitions were obtained.If flow field between flame front and cloud origin was dealt with by Sedov solution,and Mac Cormack scheme was used to get following flow distribution.