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Passive control of supersonic cavity flowfieldsA computational investigation has been conducted to study the effect and mechanisms of the passive control of a supersonic flow over a rectangular two-dimensional cavity. The passive control was included through the use of a porous surface over a vent chamber in the floor of the cavity. The passive control effectively suppressed the low-frequency pressure oscillations for the open type cavity, (length-to-depth ratio = 6.0). The mechanism for the suppression was observed to be the stabilization of the motion of the free shear layer. For the closed type cavity flow, (length-to-depth ratio = 17.5), the passive control modified the flowfield to nearly that of an open type cavity flow; further the cavity drag was reduced by a factor of four. The computational results of both cases showed good agreement with the available experimental data and the predictions of a semiempirical formula. This study demonstrates that the passive control concept can be used to improve the aerodynamic characteristics of open and closed cavity flowfields.
Document ID
19920057364
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chokani, N.
(NASA Langley Research Center Hampton, VA, United States)
Kim, I.
(North Carolina State University Raleigh, United States)
Date Acquired
August 15, 2013
Publication Date
September 1, 1991
Subject Category
Aerodynamics
Report/Patent Number
SAE PAPER 912153
Accession Number
92A39988
Funding Number(s)
CONTRACT_GRANT: NAGW-1072
CONTRACT_GRANT: NCC1-46
Distribution Limits
Public
Copyright
Other

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