The skin friction distribution around multiple jets in crossflow determined using the fringe imaging skin friction (FISF) technique is examined experimentally for two supply channel configurations. The velocity field associated with the jets is correlated to the skin friction distribution. A counterflow supply channel configuration has a pronounced skin friction deficit downstream of the injection holes caused by the lifting of fluid away from the wall by the counterrotating vortex pair (CRVP). In the counterflow case, the CRVP remains closer to the wall than in the coflow case. A potential flow analysis of a pair of counterrotating vortices above a wall demonstrates that the distance of the CRVP from the wall has a greater effect on the wall pressure distribution, and hence the separation phenomena, than does the strength of the vortices.
Experiments in Fluids – Springer Journals
Published: Jun 23, 2004
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