氢氧爆轰波在激波管中的成长机制研究

 针对气相爆轰波成长机制研究，采用压力传感器和高速摄影技术，测试了氢氧混合气体在点火后的火焰波、前驱冲击波以及爆轰波的成长变化过程，计算了冲击波过程参数和气体状态参数，分析了火焰加速机制。实验结果表明，APX-RS型高速摄影系统可用于拍摄气相爆轰波的成长历程；氢氧爆轰波的产生是由于湍流火焰和冲击波的相互正反馈作用，导致反应区内多处发生局部爆炸，爆炸波与冲击波相互耦合，最终成长为定常爆轰波。

Study on the Development Mechanism of Detonation Wave for the Hydrogen-Oxygen Mixture in a Shock Tube

This paper mainly focuses on the experimental investigation of the gaseous detonation wave build-up mechanism for hydrogen-oxygen mixture in shock tube. Five pressure sensors were used to record the pressures and a high-speed camera was used to capture velocities of flame, shock, or detonation wave. The high-speed camera records the transformation of flame, shock in the ignition phase and the attenuation of detonation wave. The experimental results show that the diagnostic system can effectively measure the DDT. The images of flame propagation show that the flame front is curving and dispersive. It is found that the interaction of shock and turbulent flame is a dominant factor  for the onset of explosion. In the smooth tube, experiments indicate that the intensity of shock wave continually increases due to the acceleration of flame. The local explosion occurs in the reaction zone when the intensity of shock wave arrives at a critical pressure p_c when some hot spots form in the local explosion centers. At that time, an unsteady detonation wave is formed immediately, and after a period of the propagation or attenuation process, it eventually evolves into a steady detonation wave.