THE EFFECT OF STREAMWISE INJECTION ON THE FLOW STRUCTURE AND SKIN FRICTION DISTRIBUTION OF A ROW OF MULTIPLE JETS-IN-CROSSFLOW : Invited Paper(Multiple Jet)

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  • Peterson Sean D.
    School of Mechanical Engineering, Purdue University Turbulent Flow Physics Laboratory
  • Plesniak Michael W.
    School of Mechanical Engineering, Purdue University Turbulent Flow Physics Laboratory

説明

The velocity field and skin friction distribution around a row of five jets issuing into a cross flow via short (L/D≈1) holes inclined by 35° in the streamwise direction are presented. The flow features are compared with previously published data for jets issuing through holes oriented normal to the cross flow. Streamwise injection eliminated the recirculation region and consequent downstream spiral separation node vortices observed in the 90° case. The jetting processes caused by in-hole separations were also found to differ, with the bulk of the jet issuing from the leading half of the streamwise injected hole. The skin friction distribution around the injection holes was very similar to that of the normal holes, particularly in the wake of the hole, despite a much lower trajectory and increased spreading. This may have implications on the understanding of the degree to which the counter-rotating vortex pair impacts the wall shear stress.

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