A spanwise array of plasma synthetic jets (PSJs) is employed to control the cavity flow at Mach 2.0 with the aim of mixing enhancement. The time responses of the flow to control are diagnosed by a high-speed schlieren imaging system and a planar particle imaging velocimetry (PIV) system. Results show that the fluctuation in the baseline flow mainly comes from the impact shock wave and the distributed compression waves above the shear layer, while in the actuated flow, the shear layer zone also manifests high-level fluctuations. Physically, the multiple shock waves induced by the PSJs are responsible for the disturbances seeded to the shear layer. A wavy shear layer can be picked in the high-order proper orthogonal decomposition modes, indicating the formation of large-scale vortices due to excitation of the Kelvin–Helmoltz instability. As the discharge frequency increases, the grayscale fluctuation in the shear layer also goes up. At the highest frequency of 5 kHz, the growth rate of the shear layer thickness is elevated noticeably by approximately 10%, and the area of high-level velocity fluctuation is expanded by 30%, when compared to the nonactuated condition.
Supersonic Cavity Flow Control Using Plasma Synthetic Jet Actuators
AIAA Journal ; 63 , 5 ; 1732-1742
01.05.2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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