定态火焰在可燃预混气中产生的压力波

火焰在可燃预混气中传播时，在火焰面前方产生一道压力波。忽略点火及火焰的初期加速，仅考虑火焰达到稳定传播速度的情况。用Ｏｐｅｎｈｅｉｍ自相似解分析流场，得到相应的控制方程及定解条体；用自适应步长的四阶Ｒｕｎｇｅ－Ｋｕｔｔａ法对方程积分，讨论了流场压力波结构及弱激波近似声波解；认为火焰为间断面，能量释放在火焰面后瞬时完成。利用火焰面两侧的能量关系，得到了火焰位置、燃速及对应Ｃ－Ｊ条件的火焰位置、Ｃ－Ｊ燃速。

PRESSURE WAVES GENERATED BY STEADY FLAME PROPAGATING IN PREMIXED COMBUSTIBLE GAS

Pressure waves can be generated by a steady flame which propagates in premjxed gases,Under condition of steady flame,self-similar approach is used to analyze the flow field by neglect of ignition process and initial flame acceleration. The adaptive 4th-order Rungc-Kutta method is applied to integrate the equations with boundary conditions in phase plane.The stracture of pressure weve,flame position and flame speed are obtained.when Mach number of the pressure wave approaches unity,integral solution is compatible with the acoustic solution.