初始压力和狭缝宽度对毫米量级狭缝内爆轰起爆距离的影响

为获得狭缝内爆轰起爆距离的影响因素，分别在高度为1.0 mm，宽度为10、20、30 mm的狭缝爆轰管内，对不同初始压力下(p₀=5.0~50.0 kPa)等当量比的乙烯/氧气预混气体进行了单次爆轰性能实验研究。根据烟迹法、高速摄影图片判定起爆位置，分析了初始压力和狭缝宽度对爆轰起爆距离的影响。结果表明:(1)p₀=21.0~30.0 kPa时，起爆距离随着狭缝宽度的增大而逐渐缩短；(2)p₀=35.0~42.5 kPa时，起爆距离随着狭缝宽度的增大先缩短后增大，在p₀=45.0~50.0 kPa时起爆距离随着狭缝宽度的增大基本保持不变；(3)3种狭缝宽度下，量纲一起爆距离随量纲一初始压力的变化曲线差异较大。

Effects of initial pressure and gap width on detonation initiation distance in a narrow gap with millimeter-scale width

The detonation initiation distance for stoichiometric C₂H₄/O₂ mixture gas in a narrow gap was experimentally studied at the initial pressure of 5.0-50.0 kPa. The channels were formed by the 10, 20, 30 mm×1.0 mm cross-sections and 1 220 mm long, respectively. the initiation positions were determined by the soot records and the high-speed digital imagings. The influence of initial pressure and gap width on detonation initiation distance was analyzed. The results indicate that: (1) initiation distance decreases with the increase of gap width at the initial pressure of 21.0-30.0 kPa; (2) with the increase of gap width, initiation distance initially decreases and then increases at the initial pressure of 35.0-42.5 kPa, and remains unchanged at the initial pressure of 45.0-50.0 kPa; (3) the non-dimensional change curves between detonation initiation distance and initial pressure are different corresponding to the three different gap widths.