Control of shock-induced vortex breakdown on a delta-wing-body configuration in the transonic regime

Kurade, RB and Venkatakrishnan, L and Jagadeesh, G (2021) Control of shock-induced vortex breakdown on a delta-wing-body configuration in the transonic regime. In: Aeronautical Journal .

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Abstract

Shock-induced vortex breakdown, which occurs on the delta wings at transonic speed, causes a sudden and significant change in the aerodynamic coefficients at a moderate angle-of-attack. Wind-tunnel tests show a sudden jump in the aerodynamic coefficients such as lift force, pitching moment and centre of pressure which affect the longitudinal stability and controllability of the vehicle. A pneumatic jet operated at sonic condition blown spanwise and along the vortex core over a 60° swept delta-wing-body configuration is found to be effective in postponing this phenomenon by energising the vortical structure, pushing the vortex breakdown location downstream. The study reports that a modest level of spanwise blowing enhances the lift by about 6 to 9 and lift-to-drag ratio by about 4 to 9, depending on the free-stream transonic Mach number, and extends the usable angle-of-attack range by 2°. The blowing is found to reduce the magnitude of unsteady pressure fluctuations by 8 to 20 in the aft portion of the wing, depending upon the method of blowing. Detailed investigations carried out on the location of blowing reveal that the blowing close to the apex of the wing maximises the benefits. © The Author(s), 2021. Published by Cambridge University Press on behalf of Royal Aeronautical Society.

Item Type:	Journal Article
Publication:	Aeronautical Journal
Publisher:	Cambridge University Press
Additional Information:	The copyright for this article belongs to Cambridge University Press
Keywords:	Aerodynamic stability; Angle of attack; Automobile bodies; Lift; Lift drag ratio; Supersonic aircraft; Swept wings; Vortex flow; Wind tunnels, Along-the-core blowing; Core blowing; Delta wings; Shock induced; Shock-induced vortex breakdown; Span-wise blowing; Transonic regime; Vortex breakdown; Wing-body configurations, Delta wing aircraft
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	04 Jan 2022 05:26
Last Modified:	04 Jan 2022 05:26
URI:	http://eprints.iisc.ac.in/id/eprint/70856

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