Experimental Hydrodynamics of the Accelerated Turbulent Boundary Layer With and Without Mass Injection

[+] Author and Article Information
H. L. Julien

General Motors Research Laboratories, Warren, Mich.

W. M. Kays, R. J. Moffat

Department of Mechanical Engineering, Stanford University, Stanford, Calif.

J. Heat Transfer 93(4), 373-379 (Nov 01, 1971) (7 pages) doi:10.1115/1.3449833 History: Received December 29, 1970; Online August 11, 2010


Mean velocity-profile data are reported for blown, unblown, and sucked accelerated turbulent boundary layers. The pressure gradients investigated are those corresponding to constant values of the pressure-gradient parameter

K = νU2 dUdx
The two values of K considered in detail are 0.57 × 10−6 and 1.45 × 10−6 . For each pressure gradient, the surface boundary conditions cover a range of constant blowing and sucking fractions from F = −0.002 to +0.004. Velocity profiles corresponding to these accelerated flows are shown to differ substantially from those characteristic of zero-pressure-gradient flows. For each case of a constant K acceleration, sequential values of the momentum-thickness Reynolds number approach a specific constant, and the velocity distributions near the wall are similar in both wall coordinates and outer coordinates. Results obtained here can be reproduced by a numerical integration of the boundary-layer equations using a modification of the van Driest damping factor, A+ , derived from the data presented here. The A+ correlation is presented.

Copyright © 1971 by ASME
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