Experimental investigations of detonation initiation by hot jets in supersonic premixed flows |
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Authors: | Han Xu Zhou Jin and Lin Zhi-Yong |
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Affiliation: | Science and Technology on Scramjet Laboratory, National University of Defence Technology, Changsha 410073, China |
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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 jet pressure is lower than a certain value,the ODW will decouple.In contrast,the normal detonation wave can sustain itself without the hot jet. |
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Keywords: | hot jet detonation supersonic flow |
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