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Aerodynamic control of NASP-type vehicles through vortex manipulation. Volume 3: Wing rock experimentsFree-to-roll tests were conducted in water and wind tunnels in an effort to investigate the mechanisms of wing rock on a NASP-type vehicle. The configuration tested consisted of a highly-slender forebody and a 78 deg swept delta wing. In the water tunnel test, extensive flow visualization was performed and roll angle histories were obtained. In the wind tunnel test, the roll angle, forces and moments, and limited forebody and wing surface pressures were measured during the wing rock motion. A limit cycle oscillation was observed for angles of attack between 22 deg and 30 deg. In general, the experiments confirmed that the main flow phenomena responsible for the wing-body-tail wing rock are the interactions between the forebody and the wing vortices. The variation of roll acceleration (determined from the second derivative of the roll angle time history) with roll angle clearly slowed the energy balance necessary to sustain the limit cycle oscillation. Different means of suppressing wing rock by controlling the forebody vortices using small blowing jets were also explored. Steady blowing was found to be capable of suppressing wing rock, but significant vortex asymmetrices are created, causing the model to stop at a non-zero roll angle. On the other hand, alternating pulsed blowing on the left and right sides of the fore body was demonstrated to be a potentially effective means of suppressing wing rock and eliminating large asymmetric moments at high angles of attack.
Document ID
19940011307
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Suarez, Carlos J. (Eidetics International, Inc. Torrance, CA, United States)
Smith, Brooke C. (Eidetics International, Inc. Torrance, CA, United States)
Kramer, Brian R. (Eidetics International, Inc. Torrance, CA, United States)
Ng, T. Terry (Eidetics International, Inc. Torrance, CA, United States)
Ong, Lih-Yenn (Eidetics International, Inc. Torrance, CA, United States)
Malcolm, Gerald N. (Eidetics International, Inc. Torrance, CA, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1993
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-177626
A-93138
NAS 1.26:177626
Accession Number
94N15780
Funding Number(s)
CONTRACT_GRANT: NAS2-13196
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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