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在超燃燃烧室凹腔上游及其底部近前壁面处布置电极产生丝状等离子体,基于准直流电弧放电热阻塞原理,采用数值模拟方法研究了等离子体对燃烧室均温、凹腔均温、剪切层、凹腔阻力以及质量交换率的影响。结果显示:等离子体对燃烧室整体的温升效应可以忽略,但能够明显提高凹腔内平均温度;受丝状等离子体对凹腔的预热及对剪切层的“切割”作用,剪切层中沿流动方向的涡强度降低,从而降低了凹腔前缘及后缘撞击激波强度,使其附近压力分布更平滑;丝状等离子体存在时,凹腔阻力系数明显下降,质量交换率也大幅提高,但增大等离子体输入功率对改善控制效果的影响不明显。
Based on the principle of quasi-arc discharge thermal blockage, electrodes are arranged on the upper wall of the supertex combustion chamber and near the bottom wall of the sucker chamber to generate filamentous plasma. The effects of plasma on the average temperature of the chamber, Shear layer, cavity resistance and mass exchange rate. The results show that the effect of plasma on the whole combustion chamber can be neglected, but the average temperature in the cavity can be obviously increased. The preheating of the cavity by filamentous plasma and the “cutting” effect on the shear layer, The eddy strength in the shear layer decreases along the flow direction, so the impact shock intensity at the leading edge and the trailing edge of the cavity is reduced and the pressure distribution in the vicinity of the cavity is smoother. In the presence of filamentous plasma, the cavity resistance coefficient decreases obviously. Exchange rate also increased significantly, but increasing the plasma input power to improve the control effect is not obvious.