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为了研究凹腔火焰稳定器在超燃冲压发动机燃烧室内的阻力情况,采用了试验和数值仿真的方法,结合已有的研究结果、纹影图像和阻力测量等进行了分析。结果表明:在冷流中凹腔阻力受自由剪切层与后壁作用情况决定,来流总压高,作用面积大,凹腔阻力大;在反应流中,凹腔阻力小于冷流阻力,在高当量比条件下凹腔可能产生正推力;凹腔附近最强燃烧放热区对凹腔阻力影响较大,当最强放热区分布在凹腔前壁附近时凹腔可能产生推力;当最强燃烧放热区分布在凹腔后壁时,凹腔可能产生阻力。
In order to study the resistance of the cavity flame stabilizer in the combustion chamber of scramjet, experimental and numerical simulation methods are used in combination with the existing research results, the image of the shadow and the resistance measurement. The results show that the cavity resistance in the cold flow is determined by the action of the free shear layer and the back wall. The total pressure of the flow is high, the area of action is large and the cavity resistance is large. In the reaction flow, the cavity resistance is less than the resistance of cold flow, The concave cavity may produce positive thrust at high equivalence ratio; the strongest combustion exothermic zone near the cavity has a greater influence on the cavity resistance, and the cavity may generate thrust when the strongest exothermic area is distributed near the front wall of the cavity; When the strongest combustion exothermic zone is located in the back wall of the cavity, the cavity may create resistance.