Control of Supersonic Flow Over an Open Cavity with a Leading-Edge Spanwise Tab Array
Abstract
Flow over an open cavity presents a dynamically rich flow dominated by broadband and tonal resonant effects. In the current study, passive control via a spanwise array of tabs along the cavity leading edge is performed on an open cavity of L/D = 6 at Mach 1.4. The spanwise wavelength of the fences is one cavity depth while the height was determined to match the penetration extent of spanwise-arranged leading edge slots of the same wavelength utilized in in the same flow facility. Significant fluctuating surface pressure reductions of up to 45% of Prms are observed along the cavity floor and rear wall. Particle Image Velocimetry (PIV) is conducted to compare the velocity fields of the baseline flow with the controlled case. Two-component PIV measurements in streamwise aligned (x-y) planes revealed that fences produce lifting of the shear layer along with modifications of the recirculation characteristics. Stereoscopic PIV at cross-stream aligned (y-z) planes reveal the presence of counter-rotating vortices causing increased mixing of the flow. These observations are consistent with findings using leading edge blowing control in.
This work is supported by AFOSR Award Number FA9550-17-1-0380 with program manager, Dr. Gregg Abate.- Publication:
-
APS Division of Fluid Dynamics Meeting Abstracts
- Pub Date:
- 2020
- Bibcode:
- 2020APS..DFDG08003U