Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

Best Paper Award Selection - Editorial Board Site

2000, Volume7

Issue 3

96 pages

Issue price - $140.00

Norman Toy
Fluid Mechanics Research Group, Department of Civil Engineering, University of Surrey, Guildford GU2 5XH, Surrey, United Kingdom

Eric Savory
Fluid Mechanics Research Group, Department of Civil Engineering, University of Surrey, Guildford GU2 5XH, Surrey, United Kingdom

Peter J. Disimile
USAF 46 Test Wing, Aerospace Survivability and Safety Flight Wright-Patterson AFB, Ohio 45433-7605, USA

A wind tunnel investigation was carried out to examine the surface flow and skin friction distribution within a yawed cavity having a rectangular aspect ratio of 11.79 and a width/depth ratio of 2. The cavity was placed flush with a ground plane and subjected to a turbulent boundary layer flow at a Mach number of 2 and a Reynolds number of 7.3 × l0⁴, based on momentum thickness. The data obtained were video recordings of liquid crystal surface coatings that changed color with shear stress and with changes in yaw angle. It was found that the crystals could provide some assistance in describing the type of fluid motion that occurs in open and closed types of cavities. At low angles of yaw, the fluid motion is one of low shear, whereas at the higher yaw angles, large shear stress areas within the cavity are observed. This is accompanied by increased recirculation regions near the upstream end of the cavity at high yaw angles, with several different vortices being set up at the downstream end to eject excess fluid.

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