封闭空间中斜爆震驻定稳定性增强方法及其试验验证

采用斜爆震燃烧的高超声速冲压发动机是具有潜力的高马赫数吸气式推进技术方案.克服斜爆震的驻定稳定性问题对实现该技术方案至关重要.本文提出了一种封闭空间中的斜爆震驻定稳定性增强方法,并基于此方法开展了马赫数8.0近真实条件下的直连式试验验证.采用阵列喷管制造超声速预混气,通过关闭近壁单元中的燃料供应,在壁面附近制造了不可燃...

Standing stability enhancement method of oblique detonation waves in a confined space and its experimental validation

Hypersonic ramjets with the combustion mode of oblique detonation are promising in the high-Mach-number air-breathing propulsion field. It is very important to overcome the standing stability problem of oblique detonation waves for realizing this technical scheme. A standing stability enhancement method of oblique detonation waves in a confined space is proposed and validated in a direct-connect experiment under the Ma 8.0 near-real condition. Supersonic premixed gases are produced by using array nozzles and a non-reacting gas layer is formed by cutting off the fuel supply in the near-wall nozzle units. After the oblique detonation wave enters the near-wall region, it decays to an inert shock wave due to the presence of the non-reaction gas layer and therefore its Mach reflection on the wall can be significantly weakened to avoid choking flow. Through this method, the standing stability of oblique detonation waves is well enhanced and a long-time standing oblique detonation wave is obtained under the near-real condition.