Experimental investigations of detonation initiation by hot jets in supersonic premixed flows

doi:10.1088/1674-1056/21/12/124702

Chin. Phys. B ›› 2012, Vol. 21 ›› Issue (12): 124702-124702.doi: 10.1088/1674-1056/21/12/124702

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Experimental investigations of detonation initiation by hot jets in supersonic premixed flows

韩旭, 周进, 林志勇

Science and Technology on Scramjet Laboratory, National University of Defence Technology, Changsha 410073, China

收稿日期:2012-03-12 修回日期:2012-06-08 出版日期:2012-11-01 发布日期:2012-11-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 91016028 and 91016012).

Experimental investigations of detonation initiation by hot jets in supersonic premixed flows

Han Xu (韩旭), Zhou Jin (周进), Lin Zhi-Yong (林志勇)

Science and Technology on Scramjet Laboratory, National University of Defence Technology, Changsha 410073, China

Received:2012-03-12 Revised:2012-06-08 Online:2012-11-01 Published:2012-11-01
Contact: Han Xu E-mail:hanxuyun@yahoo.com.cn;zj706@vip.sina.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 91016028 and 91016012).

摘要/Abstract

摘要： A new method to initiate and sustain the detonation in supersonic flow is investigated. The reaction activity of coming flow may influence the result of detonation initiation. When a hot jet initiates a detonation wave successfully, there may exist two types of detonations. If the detonation velocity is greater than the velocity of coming flow, there will be a normal detonation here. Because of the influence of boundary layer separation, the upstream detonation velocity is much greater than the Chapman-Jouguet (CJ) detonation velocity. On the other hand, if the detonation velocity is less than the velocity of coming flow, an oblique detonation wave (ODW) will form. The ODW needs a continuous hot jet to sustain itself. If the pressure of jet is lower than a certain value, the ODW will decouple. In contrast the normal detonation wave can sustain itself without the hot jet.

关键词: hot jet, detonation, supersonic flow

Abstract: A new method to initiate and sustain the detonation in supersonic flow is investigated. The reaction activity of coming flow may influence the result of detonation initiation. When a hot jet initiates a detonation wave successfully, there may exist two types of detonations. If the detonation velocity is greater than the velocity of coming flow, there will be a normal detonation here. Because of the influence of boundary layer separation, the upstream detonation velocity is much greater than the Chapman-Jouguet (CJ) detonation velocity. On the other hand, if the detonation velocity is less than the velocity of coming flow, an oblique detonation wave (ODW) will form. The ODW needs a continuous hot jet to sustain itself. If the pressure of jet is lower than a certain value, the ODW will decouple. In contrast the normal detonation wave can sustain itself without the hot jet.

Key words: hot jet, detonation, supersonic flow

中图分类号: (Detonation waves)

47.40.Rs

47.40.Ki (Supersonic and hypersonic flows) 47.40.-x (Compressible flows; shock waves)

韩旭, 周进, 林志勇. Experimental investigations of detonation initiation by hot jets in supersonic premixed flows[J]. Chin. Phys. B, 2012, 21(12): 124702-124702.

Han Xu (韩旭), Zhou Jin (周进), Lin Zhi-Yong (林志勇). Experimental investigations of detonation initiation by hot jets in supersonic premixed flows[J]. Chin. Phys. B, 2012, 21(12): 124702-124702.

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Experimental investigations of detonation initiation by hot jets in supersonic premixed flows

Experimental investigations of detonation initiation by hot jets in supersonic premixed flows

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