气相爆轰波在障碍物上Mach反射的实验验证  

The Experimental Evidence for Mach Reflection of Gaseous Detonation Waves Acting on an Obstacle

作　　者：郭长铭[1] 张德良[2] 谢巍[2] 

机构地区：[1]中国科学技术大学力学和机械工程系,安徽合肥230026 [2]中国科学院力学研究所,北京100080

出　　处：《实验力学》2000年第3期298-305,共8页Journal of Experimental Mechanics

基　　金：国家自然科学基金委员会的支持!(批准号 :1 9872 0 68)

摘　　要：本文公布了气相爆轰波沿收缩管道传播时发生 Mach反射的实验证据 .在爆轰波通过的管道中安装不同楔角的楔块 ,形成管道的收缩 .爆轰波在通过楔块时会发生 Mach反射 .利用烟熏玻璃片记录到了爆轰波 Mach反射时形成的三波点迹线及其两侧胞格尺寸和密度的变化 .据我们掌握的资料 ,这是首次用胞格结构变化的记录证实 ,气相爆轰波与无化学反应的空气中的冲击波一样 ,在一定的入射条件下会发生Mach反射 .这一实验结果可使我们更深入了解爆轰波的本质 ,也为数值模拟气相爆轰波在障碍物上The experimental evidence for Mach reflection of gaseous detonation waves acting on an obstacle is presented in this paper. Wedges with different wedge angle are mounted on the side wall of tube to form convergent tube. The Mach reflection is shaped when detonation waves propagate on a wedge. The trajectory of triple point of Mach reflected detonation wave was recorded for the first time by smoked foil. On both sides of the trajectory, the change of cell size and shape is very obvious. According to the literature known to us, it is confirmed for the first time by cellular structure that as shock waves in non reactive air, the detonation waves can also shape Mach reflection under certain conditions. These experimental results not only help us deeply understanding the nature of detonation waves but also afford a reference for comparison when we make numerical simulation for this phenomenon.

关 键 词：胞格结构 MACh反射 实验 气相爆轰波 障碍物 

分 类 号：O381[理学—流体力学] O382.1[理学—力学]