In this paper, the effects of streamwise Nanosecond Dielectric Barrier Discharge (NS-DBD) actuators on Shock Wave/Boundary Layer Interaction (SWBLI) are investigated in a Mach 2.5 supersonic flow. In this regard, the numerical investigation of NS-DBD plasma actuator effects on unsteady supersonic flow passing a 14° shock wave generator is performed using simulation of Navier-Stokes equations for 3D-flow, unsteady, compressible, and SST turbulent model. In order to evaluate plasma discharge capabilities, the effects of plasma discharge length on the flow behavior are studied by investigating the flow friction factor, the region of separation bubble formation, velocity, and temperature distribution fields in the SWBLI region. The numerical results showed that plasma discharge increased the temperature of the discharge region and boundary layer temperature in the vicinity of flow separation and consequently reduced the Mach number in the plasma discharge region. Plasma excitation to the separation bubbles shifted the separation region to the upstream around 6 mm, increased SWBLI height, and increased the angle of the separation shock wave. Besides, the investigations on the variations of pressure recovery coefficient illustrated that plasma discharge to the separation bubbles had no impressive effect and decreased pressure recovery coefficient. The numerical results showed that although the NS-DBD plasma actuator was not effective in reducing the separation area in SWBLI, they were capable of shifting the separation shock position upstream. This feature can be used to modify the structure of the shock wave in supersonic intakes in off-design conditions.

中文翻译：

---

纳秒介电势垒放电等离子致动器超音速流动控制研究

在本文中，研究了流向纳秒介电势垒放电 (NS-DBD) 致动器在 2.5 马赫超音速流动中对冲击波/边界层相互作用 (SWBLI) 的影响。在这方面，NS-DBD 等离子体致动器对通过 14° 激波发生器的非定常超音速流的影响的数值研究是使用 Navier-Stokes 方程的模拟进行的，用于 3D 流、非定常、可压缩和SST 湍流模型。为了评估等离子体放电能力，通过研究 SWBLI 区域的流动摩擦因子、分离气泡形成区域、速度和温度分布场，研究了等离子体放电长度对流动​​行为的影响。数值结果表明，等离子体放电提高了放电区的温度和流动分离附近的边界层温度，从而降低了等离子体放电区的马赫数。对分离气泡的等离子体激发使分离区域向上游移动约 6 mm，增加了 SWBLI 高度，并增加了分离冲击波的角度。除了，对压力恢复系数变化的研究表明，等离子体放电对分离气泡没有显着影响，降低了压力恢复系数。数值结果表明，虽然 NS-DBD 等离子体致动器不能有效减少 SWBLI 中的分离面积，但它们能够将分离激波位置向上游移动。此功能可用于在非设计条件下修改超音速进气道中的激波结构。