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

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

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.

Keywords: hot jet detonation supersonic flow

Received: 12 March 2012
Revised: 08 June 2012
Accepted manuscript online:

PACS:	47.40.Rs	(Detonation waves)
	47.40.Ki	(Supersonic and hypersonic flows)
	47.40.-x	(Compressible flows; shock waves)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 91016028 and 91016012).

Corresponding Authors: Han Xu
E-mail: hanxuyun@yahoo.com.cn;zj706@vip.sina.com

Cite this article:

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 2012 Chin. Phys. B 21 124702

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

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