压气机叶栅内流环境中纳秒脉冲等离子体的气动激励特性

Characteristics of Nanosecond Pulsed Plasma Aerodynamic Actuation in Compressor Cascade Internal Flow Environment

为揭示纳秒脉冲等离子体气动激励(NSPAA)不同工况下在压气机叶栅内流环境中的激励特性,建立了唯象学热源模型模拟纳秒脉冲等离子气动激励对流场作用的压强特性和温度特性。将求解得到的纳秒脉冲等离子体气动激励对流场作用的压强特性和温度特性与实验数据进行了对比,结果相符,验证了模型的可靠性。在静止空气中以及高亚音速来流条件下,分别在压气机叶栅内流环境中不同流域中施加纳秒脉冲等离子体气动激励,结果表明:纳秒脉冲等离子体气动激励诱导气流加速能力有限,其对流场的作用主要表现为冲击效应;在静止空气中、高速主流区和分离区中纳秒脉冲等离子体气动激励均能诱导产生强的压缩波,且在高速主流区和分离区中对流场冲击作用更强;纳秒脉冲等离子体气动激励在放电区域引起局部温升,激励之后温度快速降低,主流区和分离区温度下降速度快于静止空气中温度下降速度。

In order to obtain the characteristics of nanosecond pulsed plasma aerodynamic actuation （NSPAA） in compressor cascade internal flow environment, we established a phenomenological model to simulate the pressure and temperature of NSPAA. The calculated results are in accordance with experimental results, which verify the reliability of the model. Then we imposed the NSPAA in different flow fields of the compressor cascade passage in static air and with high-subsonic incoming flow. The calculation results show that the NSPAA has a limited ability to accelerate airflow, which acts mainly as the shock effect on the flow field. The NSPAA induces strong compressive wave in static air, high-speed main stream flow field, and separation zone, which has a stronger shock effect on the flow filed in high-speed main stream flow field and separation zone. The NSPAA arouses temperature in discharge region, but the temperature decreases quickly after the actuation. Meanwhile, the temperature in separation zone and main stream decreases faster than that in static air.