Experimental study of transition mechanism of mach reflection of detonation wave

被引：0

作者：

Liu J. ^{[1
]}

Du Z.-H. ^{[1
]}

机构：

[1] School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing

来源：

Tuijin Jishu/Journal of Propulsion Technology | 2016年 / 37卷 / 04期

关键词：

Cellular structure; Gaseous detonation; Mach reflection; Overdriven;

D O I：

10.13675/j.cnki.tjjs.2016.04.002

中图分类号：

学科分类号：

摘要：

Using Schlieren photography and smoked foils, transition mechanism of Mach reflection of detonation wave under CJ state was studied experimentally in a rectangular channel. Stable mixture C2H2-2.5O2-8.17Ar highly diluted by argon with fairly regular cellular pattern and unstable mixture C2H2-5N2O with irregular cellular pattern were used for experiments. At wedge angle 30°, 5 kPa initial conditions, the critical height of Mach stem was about 1.25 cm when transition of Mach reflection happened in C2H2-2.5O2-8.17Ar and the minimum distance for appearing overdriven cell structure was slightly less than 1/3 of cell length. While for C2H2-5N2O, the critical height of Mach stem was about 1.5 cm and it was difficult to measure the distance due to its irregular cellular structure. The experimental results demonstrate that trajectory of Mach reflection in detonation waves follows triple point trajectory of non-reactive shock theory at beginning of wedge, and then falls on a line parallel to triple point trajectory of reactive shock theory when transition of Mach reflection happens, which verifies that Mach reflection of leading shock is formed at beginning of wedge in detonation waves, and then transforms into overdriven detonation in Mach reflection region owing to perturbations yielded by triple points in CJ region. © 2016, Journal of Propulsion Technology. All right reserved.

引用

页码：608 / 616

页数：8

共 25 条

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