A comparative study on millimeter-scale flame jet and detonation diffraction in a rectangular chamber

Jiannan He, Wei Fan, Yeqing Chi, Jiawei Zheng, Wenlong Zhang

科研成果: 书/报告/会议事项章节会议稿件同行评审

6 引用 (Scopus)

摘要

An experiment on high-speed turbulent flame jet and detonation diffraction in a rectangular chamber is conducted in this study. Smooth tubes with 6 mm inner diameter and different lengths are used as pre-detonators. The gaseous mixture is ethylene/oxygen with nitrogen diluted filling uniformly in both the pre-detonator and the main chamber. Flame propagations in the chamber and the velocities are observed and measured by a high-speed camera. The results show that overdriven detonation in the pre-detonator is crucial to the detonation re-initiation, which validates the argument of previous researcher’s. However, we further observed and distinguished four kinds of detonation re-initiation modes by changing the dilution ratio and the tube length. It is experimentally proved that if the overdriven detonation point is close to the exit of the pre-detonator, not only detonation re-initiation would be strengthened, but also direct initiation might possibly occur, even if the transmission ratio k is smaller than the critical value kc. The DDT distance in the chamber and the velocity characterizations are also found to be greatly affected by the flame propagation conditions in the pre-detonator.

源语言英语
主期刊名21st AIAA International Space Planes and Hypersonics Technologies Conference, Hypersonics 2017
出版商American Institute of Aeronautics and Astronautics Inc, AIAA
ISBN(印刷版)9781624104633
DOI
出版状态已出版 - 2017
活动21st AIAA International Space Planes and Hypersonics Technologies Conference, Hypersonics 2017 - Xiamen, 中国
期限: 6 3月 20179 3月 2017

出版系列

姓名21st AIAA International Space Planes and Hypersonics Technologies Conference, Hypersonics 2017

会议

会议21st AIAA International Space Planes and Hypersonics Technologies Conference, Hypersonics 2017
国家/地区中国
Xiamen
时期6/03/179/03/17

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