过渡段对爆震波衍射过程的影响分析

Investigation on the influence of transition section on diffraction of detonation

关键词:  脉冲爆震发动机  爆震波衍射  过渡段

Key words:  Pulse detonation engine  Diffraction of detonation  Transition section

摘要:

为了研究过渡段对爆震波衍射过程的影响,以氢气和氧气混合物为例,对不同过渡段张角下爆震波的衍射过程进行了数值模拟,结果表明,爆震波会在过渡段壁面产生反射激波,其强度随张角的减小而增大,同时,反射激波能将传入过渡段的爆震波分为3段,并在分界处产生高温、高压点,对爆震波从预爆管向主爆管的传播具有加强作用。模拟结果对预爆管起爆主爆震管实验中过渡段的选型有一定的参考意义。

Abstract:

In order to investigate the influence of transition section on diffraction of detonation,diffraction of detonation with different transition angles were simulated with hydrogen-oxygen as the mixture.The results indicate that reverberation shock is generated on transition section wall,and its intensity will increase as the angle decreases.Meanwhile,detonation wave is disparted in three sections.High pressure and high temperature points are generated in the joint position.As a result of this detonation wave transition is enhanced.The simulation results may be helpful on selection of transition section in experiments of detonation transmission from the pre-detonator to main combustor tube.