Effect of Vertically-arranged Strut on the Mixing and Initiation Characteristics of Oblique Detonation Engine
The oblique-detonation engine is a new type of air-breathing engine that has great advantages in hypersonic flight above Mach 9.The oblique detonation engine with inner-jet configuration faces the problem of inhomogeneous fuel mixing due to the short mixing distance,and the inhomogeneous fuel distribution affects the stable and reliable detonation of detonation wave.A vertically-arranged strut is proposed for the efficient and low-resistance mixing of fuel.The superiority of vertically-arranged strut in achieving the stable detonation of oblique detonation waves is studied through numerical simulation,and the influence of the injection angle of vertically-arranged strut on the fuel mixing and detonation is analyzed.The results show that the hydrogen mass fraction at the outlet of the mixing section reduces with the increase in the injection angle of vertically-arranged strut,leading to the bending of hydrogen distribution structure.At the same time,the detonation area is tilted,and the detonation distance increases slightly and then gradually decreases.It can be seen that the increase in the injection angle of vertically-arranged strut strengthens the hydrogen doping and reduces the detonation distance,thus achieving stable and reliable detonation of oblique detonation waves.
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