预混气爆震波在不同直径管间的传播特性

Investigation on Characteristics of Detonation Wave Propagation in Tubes with Different Diameter

在管径20mm与60mm的两管间研究了预混气爆震波的传播特性,着重测量了爆震波传递过程中的压力与速度变化,并分析了预混气压力、浓度、当量比以及连接段尺寸等参数对爆震波传播的影响与规律。研究发现:小管中没有爆震时大管中仍然可以出现爆震波,小张角的连接段对爆震波的再触发有利,再触发后的爆震波其压力、速度受到预混气压力、浓度及当量比等参数的影响。

The characteristics of premixed gas detonation wave propagating in two tubes with diameter, 20 mm and 60 mm respectively, were investigated. Primarily, the detonation wave pressures and velocities were measured, and the mixture pressure, concentration, equivalence ratio, and the dimension of connection tube were considered in the study. It was found that the detonation could appear in the bigger tube even when the detonation was not triggered in the smaller tube. The connection tube with smaller diffusion angle is favorable for detonation re-triggering. The pressure and velocity of re-triggered detonation are affected by mixture pressure, concentration, and equivalence ratio.