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Adaptive Suction and Blowing for Twin-Tail Buffet ControlAdaptive active flow control for twin-tail buffet alleviation is investigated. The concept behind this technique is to place control ports on the tail outer and inner surfaces with flow suction or blowing applied through these ports in order to minimize the pressure difference across the tail. The suction or blowing volume flow rate from each port is proportional to the pressure difference across the tail at this location. A parametric study of the effects of the number and location of these ports on the buffet response is carried out. The computational model consists of a sharp-edged delta wing of aspect ratio one and swept-back flexible twin tail with taper ratio of 0.23. This complex multidisciplinary problem is solved sequentially using three sets of equations for the fluid flow, aeroelastic response and grid deformation, using a dynamic multi-block grid structure. The computational model is pitched at 30 deg angle of attack. The freestream Mach number and Reynolds number are 0.3 and 1.25 million, respectively. The model is investigated for the inboard position of the twin tails, which corresponds to a separation distance between the twin tails of 33% of the wing span. Comparison of the time history and power spectral density responses of the tails for various distributions of the control ports are presented and discussed.
Document ID
19990052693
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Kandil, Osama A.
(Old Dominion Univ. Norfolk, VA United States)
Yang, Zhi
(Old Dominion Univ. Norfolk, VA United States)
Date Acquired
August 19, 2013
Publication Date
June 1, 1999
Publication Information
Publication: CEAS/AIAA/ICASE/NASA Langley International Forum on Aeroelasticity and Structural Dynamics 1999
Issue: Pt. 2
Subject Category
Aircraft Stability And Control
Funding Number(s)
CONTRACT_GRANT: NAG1-648
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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