脉冲爆震发动机管外复杂波系的数值计算

Numerical calculation of complex wave system outside pulse detonation engine

关键词:  脉冲爆震发动机  数值计算  激波  CE/SE方法

Key words:  Pulse detonation engine  Numerical calculation  Shock  CE/SE method

摘要:

为了研究脉冲爆震发动机外流场复杂波系的变化特点,用时空守恒元与求解元(CE/SE)方法对单爆震管和三爆震管脉冲爆震发动机外流场进行了计算。三个爆震管并排排列,管内填充按化学当量比混合的乙烯氧气混和物。通过计算,获得了脉冲爆震发动机外流场的压力分布、温度分布、激波与膨胀波的变化特点。计算结果表明该时空守恒元与求解元方法是一种较好的爆震波模拟方法,能有效地捕捉激波等强间断;三爆震管脉冲爆震发动机相对于单爆震管脉冲爆震发动机外流场复杂,存在多道相互作用、相互影响的激波和膨胀波。

Abstract:

To investigate the characters of the complex wave system outside pulse detonation engine,the space-time Conservation Element and Solution Element(CE/SE) method was used to simulate the flow-flied outside pulse detonation engine with one tube and three tubes.Three tubes are arrayed as a line,filled with the stoichiometric ethylene-oxygen mixture.Through calculation,the pressure distribution,temperature distribution and the varieties of shocks and expansion waves were obtained.The results of calculation indicate that this CE/SE method is a preferable simulation way to capture the shocks efficiently.Flow-field outside pulse detonation engine with three tubes is more complex than one tube.Several interacting or impacting shocks and expansion waves exist.All results have revealed some insights into characters of flow-field outside pulse detonation engine.