等离子体激励抑制喷管分离流动数值模拟

为研究等离子体激励器对喷管分离流动的抑制作用，运用了模拟等离子体激励作用效果的唯象学模型，数值模拟研究了交流介质阻挡放电等离子体和电弧放电等离子体对喷管分离流动的抑制效果，并探究了电弧放电等离子体不同放电热功率密度、不同放电位置对抑制效果的影响。结果表明：电弧放电等离子体在抑制喷管分离流动方面有更好的效果。当电弧放电等离子体激励器作用于激波与边界层相互作用区的上游时，对分离流动的抑制效果最好；当电弧放电热功率密度较小时，其产生的诱导射流速度很小且不易对分离区的流线产生影响；当电弧放电热功率密度为8×10¹⁰ W/m³时，喷管的分离回流区完全消失。

Numerical investigation of nozzle flow separation control using plasma actuation

To study the control effect of the plasma actuator on nozzle separated flow, we use a phenomenological model simulating the effect of plasma excitation to numerically study the suppression effect of dielectric barrier discharge plasma and arc discharge plasma on the nozzle separated flow. The effect of different discharge thermal power densities and discharge positions of arc discharge plasma on the suppression effect is further explored. The results show that the arc discharge plasma has a better effect on suppression of nozzle separated flow. When the arc discharge plasma actuator acts on the upstream of the interaction zone of the shock wave and boundary layer, the suppression effect on the flow separation is the best; when the thermal power density of the arc discharge is small, the generated inducing jet velocity is too small to easily influence the flow field of the separation zone; when the thermal power density of the arc discharge is 8×10¹⁰ W/m³, the separation reflux area of the nozzle completely disappears.