立式激波管内云雾爆轰胞格尺寸的测定与分析

采用烟迹技术在立式激波管中测定了环氧丙烷、90#汽油、硝酸异丙酯、庚烷、癸烷、戊二烯等几种燃料气液两相云雾爆轰的胞格尺寸。结果表明，云雾爆轰的胞格尺寸随当量比的变化呈U形曲线关系，且最小胞格尺寸并不是对应于等化学当量比而是偏向于富燃料一侧，这与气相爆轰的结论是一致的。胞格尺寸随起爆能的增加而减小。当起爆能达到一定值后，胞格尺寸变化不明显，若起爆能继续增加，在通常的胞格内出现精细结构。云雾爆轰波胞格长度与宽度的比值比气相爆轰小。另外，根据烟迹记录分析了云雾爆轰作用机制，认为液滴的碎解、汽化过程以及燃烧区前导是控制气液两相云雾爆轰的主要因素。

Measurement and analysis of the cell size caused by fuel-air detonation in a vertical shock tube

The cell sizes caused by fuel-air cloud detonation were investigated by smoked foil in a vertical shock tube.It indicates that the relationship of the cell sizes and equivalence ratios shows a U-curve,The minimal cell size is obtained when equivalence ratio is slightly larger than 1.This result is similar to that in gaseous detonation.A more complex celluar structure takes place with the enhancement of ignition energy.The cell size of hydrocarbon-air cloud increases with the number of carbon atoms,and the ratio of its length to width is less than that of the gaseous fuel.Experimental results are helpful to understand the detonation nature of hydrocarbon fuel-air mixtures.