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Cavity drag at transonic speeds

Published online by Cambridge University Press:  04 July 2016

L. C. Squire  and
S. H. Nasser
L. C. Squire
Affiliation:
Department of Engineering, Cambridge University
S. H. Nasser
Affiliation:
Department of Engineering, Cambridge University
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Abstract

This paper presents the results of an investigation of the flow around rectangular and chamfered cavities at high subsonic and low supersonic speeds. Pressures measured on the faces of the cavities are integrated to find the pressure drag of the cavities. The types of cavity tested range from simple sawcuts to cavities so long that the two ends can be regarded as independent and the results for these are compared with the sum of the drags of isolated forward and rear facing steps.

Although the Reynolds numbers of the tests are similar to those in flight conditions the maximum depth of the cavities tested is only 6 mm so that the pressure resolution on the vertical faces of the cavities is limited. In spite of this it is estimated that the maximum error in the drag of any particular cavity is less than the skin friction drag on a smooth surface equal in area to half the plan area of the cavity.

Type
Research Article
Information
The Aeronautical Journal , Volume 97 , Issue 967 , September 1993 , pp. 247 - 256
Copyright
Copyright © Royal Aeronautical Society 1993 

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