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RESEARCH PAPERS

Predicted Effects of Tangential Slot Injection on Turbulent Boundary Layer Flow over a Wide Speed Range

[+] Author and Article Information
A. M. Cary

Turbulence Modeling Group, Fluid Mechanics Branch, High-Speed Aerodynamics Division, NASA Langley Research Center, Hampton, VA 23665

D. M. Bushnell

Fluid Mechanics Branch, High-Speed Aerodynamics Division, NASA Langley Research Center, Hampton, VA 23665

J. N. Hefner

Turbulent Drag Reduction and LFC, Fluid Mechanics Branch, High-Speed Aerodynamics Division, NASA Langley Research Center, Hampton, VA 23665

J. Heat Transfer 101(4), 699-704 (Nov 01, 1979) (6 pages) doi:10.1115/1.3451060 History: Received December 15, 1978; Online August 11, 2010

Abstract

Paper describes a numerical calculation method using eddy viscosity/mixing length concepts for tangential slot injection (wall-wake) flows; application of the method over a wide range of flow conditions indicates increased accuracy compared to previous work. Predictions from the numerical code were in good agreement with experiment (velocity profile, skin friction, and effectiveness data) for low and high speed flows. To achieve improved accuracy, improvements in the turbulence modeling, compared to previous research, were necessary for the imbedded shear layer region in the near field and for the wall region near shear layer impingement. Anomalous behavior was noted for far field experimental velocity profiles in low speed flow when the slot-to-free stream velocity ratio was near one.

Copyright © 1979 by ASME
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