障碍物通道起爆过程高时空分辨化学发光测量研究

High temporal-spatial measurements are vital to study the flame acceleration and detonation initiation processes in the obstacle-laden chamber. By extracting the key parameters from the captured images, the crucial factors influencing the flame acceleration can be understood. To investigate the effects of obstacles on the flame acceleration and detonation initiation processes, this work performs the high-speed chemiluminescence measurements on the flame acceleration and detonation initiation processes in obstacle channels at 154kHz. Based on the measured images, the combustion intensity, flame area and flame front curvature are extracted to investigate the flame acceleration and detonation initiation processes in obstacle-laden chambers. The results show that the combustion intensity increases by 10.2% and the flame area increases by 20% at a dilution ratio of 1 while the deflagration flame propagates through a pair of obstacles, and the increment becomes more obvious at the higher oxygen concentration. The high-speed measurements can resolve the fine structure of the deflagration and detonation waves, which can help to interpret the underlying mechanism of effects of obstacles, vortex and shock wave on the flame acceleration.