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ISSN オンライン: 2642-0554

SURFACE SHEAR STRESS MEASUREMENTS AROUND MULTIPLE JETS IN CROSSFLOW USING THE FRINGE IMAGING SKIN FRICTION TECHNIQUE

Sean D. Peterson
School of Mechanical Engineering Maurice J. Zucrow Laboratories, Purdue University West Lafayette, Indiana 47907 USA; Department of Mechanical and Mechatronics Engineering University of Waterloo 200 University Avenue West, Waterloo, Ontario, Canada

Michael W. Plesniak
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, USA; Department of Mechanical and Aerospace Engineering The George Washington University

要約

The skin friction distribution and velocity field around multiple jets in crossflow is examined experimentally for various plenum configurations. The skin friction is determined using the Fringe-Imaging Skin Friction (FISF) technique. This technique yields both the magnitude and direction of the skin friction vectors. The velocity field in the jets, measured using Particle Image Velocimetry (PIV) is analyzed and correlated to the skin friction distribution. The counter-flow plenum case has a pronounced skin friction deficit downstream of the injection holes. The deficit is caused by the lifting of fluid away from the wall by the counter-rotating vortex pair (CRVP), which in the counter-flow case stays closer to the wall than in the co-flow case. A potential flow analysis of a pair of counter-rotating vortices above a wall demonstrates that the distance of the CRVP from the wall affects the wall pressure distribution, and hence the separation phenomena, more strongly than does the strength of the vortices.