Control of low speed cavity flow using streamwise tabs at leading edge

Sathianarayanan, A and Venkatakrishnan, L and Sharma, SD (2017) Control of low speed cavity flow using streamwise tabs at leading edge. In: AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting, 9 - 13 January 2017, Grapevine, Texas.

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Official URL: https://arc.aiaa.org/doi/pdf/10.2514/6.2017-0948

Abstract

An experimental study has been carried out to study the effect of leading edge control devices on a l/d = 4 cavity flow at a freestream velocity of 32 m/s. Five different streamwise tabs that are mounted on the front wall of the cavity below the leading edge in such a manner that the top surface of the tabs is aligned with the wall surface upstream of the cavity. Both rectangular and trapezoidal shaped streamwise tabs are used. The orientation of the trapezoidal tabs are changed to have both trapezoidal and parallelogrammatic recess shapes in between them. Mean and dynamic pressure measurements and two component hot wire measurements have been carried out. The streamwise tabs have been studied by other researchers and they are known to create streamwise vorticity in their wake. These devices have not been explored with the cavity flows yet and it in known that the introduction of streamwise vorticity in the shear layer can control cavity flows. However, pressure spectra, shear layer velocity profiles (both mean and rms in streamwise and vertical direction) indicate that the cavity flow is unaltered by the introduction of these control devices. Based on the hotwire measurements across the plane normal to the streamwise direction, it can be suggested that the leading edge mounted tabs with trapezoidal and parallelogrammatic gaps are able to generate streamwise vorticity. However, the signature of this vorticity could not be found in the plane near x/l=0.9. This may be due to the fact that the tabs are experiencing high momentum flow on the top side and a near stationary dead air region that is present inside the cavity on the other side. This difference between the present study and other studies make the tabs ineffective to control the cavity flow when they are mounted inline with the leading edge.

Item Type: Conference or Workshop Item (Paper)
Subjects: AERONAUTICS > Aeronautics (General)
ENGINEERING > Fluid Mechanics and Thermodynamics
ENGINEERING > Mechanical Engineering
Depositing User: Mrs SK Pratibha
Date Deposited: 03 Jul 2019 11:30
Last Modified: 03 Jul 2019 11:30
URI: http://nal-ir.nal.res.in/id/eprint/13164

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