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Characterization of cavity flow fields using pressure data obtained in the Langley 0.3-Meter Transonic Cryogenic TunnelStatic and fluctuating pressure distributions were obtained along the floor of a rectangular-box cavity in an experiment performed in the LaRC 0.3-Meter Transonic Cryogenic Tunnel. The cavity studied was 11.25 in. long and 2.50 in. wide with a variable height to obtain length-to-height ratios of 4.4, 6.7, 12.67, and 20.0. The data presented herein were obtained for yaw angles of 0 deg and 15 deg over a Mach number range from 0.2 to 0.9 at a Reynolds number of 30 x 10(exp 6) per ft with a boundary-layer thickness of approximately 0.5 in. The results indicated that open and transitional-open cavity flow supports tone generation at subsonic and transonic speeds at Mach numbers of 0.6 and above. Further, pressure fluctuations associated with acoustic tone generation can be sustained when static pressure distributions indicate that transitional-closed and closed flow fields exist in the cavity. Cavities that support tone generation at 0 deg yaw also supported tone generation at 15 deg yaw when the flow became transitional-closed. For the latter cases, a reduction in tone amplitude was observed. Both static and fluctuating pressure data must be considered when defining cavity flow fields, and the flow models need to be refined to accommodate steady and unsteady flows.
Document ID
19930013687
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Tracy, M. B. (NASA Langley Research Center Hampton, VA, United States)
Plentovich, E. B. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1993
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-4436
NAS 1.15:4436
L-17158
Accession Number
93N22876
Funding Number(s)
PROJECT: RTOP 505-68-70-08
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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