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 Chemiluminescence Measurements on Detonation Initiation in Obstacle-Laden Chambers

关键词:  障碍物  起爆  化学发光  光学测量  燃烧强度

Key words:  Obstacles  Detonation initiation  Chemiluminescence  Optical measurements  Combustion intensity

摘要:

高时空分辨率的光学测量对认识障碍物通道中的火焰加速与起爆过程非常重要，通过自发光图像提取关键的火焰参数，可以深入地分析影响火焰加速的关键因素。为了研究障碍物对火焰加速与起爆过程的影响，采用高速化学发光测量手段，对障碍物通道中的火焰加速与起爆过程进行测量，测量的时间重复频率达到154kHz。在此基础上，提取燃烧强度、火焰面积和火焰面曲率等关键参数，对障碍物通道中火焰加速及起爆过程进行分析。结果表明，当稀释比为1时，一对障碍物最高会引起缓燃火焰燃烧强度增长10.2%，火焰面积增长20%，且该趋势在含氧浓度高的情况下更显著。高速化学自发光图像可以获得火焰加速过程中缓燃焰和爆震波的精细结构，并揭示障碍物、流体漩涡、激波对火焰加速的影响机制。

Abstract:

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.