气相爆轰波马赫反射过驱动马赫杆演化过程的实验研究  

Transition of an overdriven Mach stem in the Mach reflection of detonations in H_(2)/O_(2)mixtures

作　　者：景天雨 任会兰[1] 李健[1] JING TianYu;REN HuiLan;LI Jian(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《中国科学：技术科学》2021年第4期446-458,共13页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:12072036,11532012)资助项目。

摘　　要：为了研究过驱动爆轰波的动力学特性,特别是胞格尺寸与诱导宽度的比例关系随过驱程度的变化规律,本文对三维胞格爆轰波楔面马赫反射中过驱动马赫杆的演化过程进行了实验研究.楔块表面过驱动马赫杆波阵面的演化非常复杂,其胞格尺寸呈现出明显的三阶段模式,即在楔面顶点附近是大尺寸胞格,经过一段强化过渡距离后,快速出现非常细小的胞格,然后缓慢增长并渐近地趋近最终稳定的胞格尺寸.过驱爆轰波的这种演化模式与燃烧转爆轰中过驱爆轰波衰减过程中胞格尺寸不断减小的规律不同.这可以归因于马赫反射、横波非定常性和不稳定性的共同作用.本文发现过驱爆轰波的胞格尺寸随着过驱动程度的增加而减小,但是当过驱程度增加到一个临界值时,高驱爆轰波在烟膜上不会再产生更小的胞格.The transition of an overdriven Mach stem in the Mach reflection of cellular detonations on the wedge is experimentally studied in mixtures of hydrogen and oxygen with different argon dilutions.This study focuses on the changes in the cell size of an overdriven Mach stem on the wedge surface other than those on the sidewall.The detonation cell pattern on the wedge surface has a complicated process,i.e.,the cells decrease from a large to a small size and then increase asymptotically to a medium size,which can be considered a three-stage pattern.The changes in cell size in this case do not correspond to the normal cell-size change in a decaying overdriven detonation.This is primarily attributed to the mixed effect of Mach reflection and cellular instability.Furthermore,the cell-size ratio upon increasing the degree of overdrive is examined.It is found that the ratio decreases with increase in the degree of overdrive.However,as the wedge angle increases to a critical value,finer cells are not created on the smoke foils.

关 键 词：胞格爆轰波 过驱马赫杆 横波 演化过程 

分 类 号：TK91[动力工程及工程热物理] O381[理学—流体力学]