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Passive porosity with free and fixed separation on a tangent-ogive forebodyDespite the extensive experimental and computational data base in the literature on passive porosity, no clear explanation of the governing flow physics exists. It is theorized that the positive porosity concept modifies the external pressure loading by allowing communication between high- and low-pressure regions on the external surface. This study determines the dominant flow phenomena that govern the effectiveness of passive porosity. It aims to assess the contribution of each phenomenon as related to a porous slender axisymmetric forebody. To assess the influence of the mass transfer and pressure equalization phenomena on the effectiveness of passive porosity on slender axisymmetric forebodies, strakes were attached to the 5.0-caliber solid and porous forebodies to force crossflow separation. Longitudinal force and moment data were obtained at a Mach number of 0.1 over an angle-of-attack range of 0 to 55 deg.
Document ID
19950036769
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wood, Richard M.
(NASA Langley Research Center Hampton, VA, United States)
Banks, Daniel W.
(NASA Langley Research Center Hampton, VA, United States)
Bauer, Steven X. S.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
September 1, 1994
Publication Information
Publication: Journal of Aircraft
Volume: 31
Issue: 5
ISSN: 0021-8669
Subject Category
Aerodynamics
Accession Number
95A68368
Distribution Limits
Public
Copyright
Other

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