利用激光干涉法和纹影摄影法进行燃烧室间隙内火焰传播与气体热力学性能的研究

Investigation on Gas Thermodynamic Characteristics and Flame Propagation in Combustion Chamber Crevice by Means of Laser Interferometry and Schlieren Photograph

应用激光干涉法测定火焰传播过程中燃烧室狭窄空间内气体的温度和密度场,利用火焰传播过程中所拍摄的纹影图像对火焰在间隙内的传播状态进行了分析。结果表明:燃烧室狭窄间隙内由于激冷效应其内部气体温度边界层逐渐增厚,气体温度迅速下降,如果狭缝间隙很小时火焰将在间隙入口处熄灭,从而造成排气中未燃碳氢化合物的大量排出。

By measuring the gas temperature and density field within narrow space of combustion chamber during flame propagation by means of laser interferometry, and studying the streak pictures taken from the travelling flame the authors analize the propagating behavior of the flame. The paper notes that because of the existance of quenching effect the temperature of gas in the crevice of combustion chamber lower rapidly. If the crevice is narrow enough the flame can be extinguished at the entrance of the crevice and results in a great amount of unburned HC generation in the exhaust.