圆环形燃烧室两相混气旋转爆震波传播过程实验研究

Experimental study on propagation characteristics of rotary detonation wave in circular chamber with two-phase mixture

关键词:  旋转爆震波  两相混气  传播速度  低速爆震  实验研究

Key words:  Rotary detonation wave  Two-phase mixture  Propagation velocity  Low-speed detonation  Experimental study

摘要:

为分析不同燃烧室结构和来流工况对两相混气旋转爆震波传播过程的影响，在圆环形燃烧室内进行了实验研究。获得了不同来流总温T、燃烧室出口堵塞比β以及混气当量比φ对旋转爆震波传播特性的影响，并对典型工况下圆环形燃烧室内旋转爆震波传播频率和切向热声耦合燃烧固有频率进行了计算。结果表明，燃烧室出口堵塞比变小时有利于旋转爆震波的稳定；旋转爆震波传播速度随来流总温和当量比的提高而增加；在两相混气中获得了一种传播速度大幅低于C-J理论值的低速爆震波。

Abstract:

To research the effects of chamber structure and incoming condition on the propagation characteristics of the rotary detonation wave with liquid hydrocarbon/pure air mixture， an experimental study has been made on a circular rotary detonation chamber. Factors like the incoming total temperature， the chamber exit chocking ratio and the equivalence ratio have been considered in the experiments. The frequency of rotary detonation combustion and the frequency of tangential thermo-acoustic combustion have been calculated and analyzed in a circular chamber under typical operations. The experimental results show that the rotary detonation waves tend to be stabilized with the decrease of the chamber exit chocking ratio， the rotary detonation wave propagation velocity increases with the rise of the incoming flow total temperature and the equivalent ratio. A low-speed detonation wave with a propagation velocity significantly lower than the C-J theoretical value is obtained in the two-phase mixture.