火焰在爆震室内的传播特性对缓燃向爆震转变过程至关重要。为探究填充流量和当量比对安装矩形障碍物的爆震室内火焰加速的影响，采用乙烯为燃料、空气为氧化剂，基于高速纹影技术和化学自发光技术，通过实验研究的方式，获得了不同填充流量和当量比的纹影图像和火焰自发光图像。实验结果表明，火焰在矩形障碍物管道内传播时可分为缓慢加速和振荡加速两个阶段；适度增加填充流量会加速层流火焰向湍流火焰转变，显著促进火焰加速过程；但进一步增加填充流量并不会持续加速火焰传播，最大火焰传播速度在650~700 m/s范围内波动；当反应物当量比为1时，火焰加速效果明显优于偏贫或偏富的工况；随着反应物填充流量的增大，当量比对火焰加速的影响逐渐减弱。

The propagation characteristics of flame in an obstructed tube are crucial to the transition from slow combustion to detonation. To explore the influence of filling flow rate and equivalence ratio on flame acceleration in a rectangular obstructed tube， ethylene was used as fuel， and air was used as oxidant. Based on high-speed schlieren technology and chemiluminescence technology， schlieren images and flame chemiluminescence images with different filling flow rates and equivalence ratios were obtained through experimental research. The experimental results show that the flame propagation in a rectangular channel with obstacles can be divided into two stages： slow acceleration and oscillating acceleration. Moderately increasing the filling flow rate will accelerate the transition from laminar flame to turbulent flame， and significantly promote the flame acceleration process. However， further increasing the filling flow rate will not continuously accelerate the flame propagation， and the maximum flame propagation speed fluctuates in the range of 650 m/s to 700 m/s. When the equivalence ratio of reactants is 1， the flame acceleration effect is obviously better than that of lean or rich conditions. As the filling flow rate increases， the effect of equivalence ratio on flame acceleration gradually weakens.