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Investigation of hot jet on active control of oblique detonation waves

Chinese Journal of Aeronautics 2020年第3期33卷 861-869页

作者： Hongbin LI Jianling LI Cha XIONG Wei FAN Lei ZHAO Wenhu HAN School of Power and Energy Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine Xi’an 710072China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

The hot jet injection is utilized to actively control the oblique detonation wave,such as initiating and stabilizing an oblique detonation wave at a desired position that is shorter than the length of induction zone,and adjust the height of the oblique detonation wave at the exit of combustor when the oblique detonation wave engine is working on off-design flight *** fifth order Weighted Essentially Non-Oscillatory(WENO)scheme and a two-step reversible reaction mechanism of the stoichiometric H_2/Air are adopted in the *** the help of hot jet injection,the transition from inert oblique shock wave to the oblique detonation wave immediately occurs near the position of hot jet injection,and consequently the length of combustor can be *** angle of oblique detonation wave also decreases as the hot jet injection approaches the nose of ***,the height of the oblique detonation wave at the exit of combustor can be flexibly adjusted,and also depends on the injection position and the strength of the hot *** the velocity of the hot jet is too weak to directly trigger the overall oblique detonation wave at the position of injection,increasing the injection pressure will improve the strength of the hot jet and results in a successful transition.

关键词： Active control hot jet Numerical simulation Oblique detonation wave Supersonic propulsion

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

引用

Chinese Physics B 2012年第12期21卷 305-309页

作者：韩旭周进林志勇 Science and Technology on Scramjet Laboratory National University of Defence Technology

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 （C J） 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.

关键词： hot jet detonation supersonic flow

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