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RESEARCH PAPERS

An Experimental Investigation of Nozzle-Exit Boundary Layers of Highly Heated Free Jets

[+] Author and Article Information
J. Lepicovsky

Sverdrup Technology, Inc., NASA Lewis Research Center Group, Brook Park, OH 44142

J. Turbomach 114(2), 469-475 (Apr 01, 1992) (7 pages) doi:10.1115/1.2929167 History: Received January 15, 1990; Online June 09, 2008

Abstract

An experimental investigation of the effects of nozzle operating conditions on the development of nozzle-exit boundary layers of highly heated air free jets is reported in this paper. The total pressure measurements in the nozzle-exit boundary layer were obtained at a range of jet Mach numbers from 0.1 to 0.97 and jet total temperatures up to 900 K. The analysis of results shows that the nozzle-exit laminar boundary-layer development depends only on the nozzle-exit Reynolds number. For the nozzle-exit turbulent boundary layer, however, it appears that the effects of the jet total temperature on the boundary-layer integral characteristics are independent from the effect of the nozzle-exit Reynolds number. This surprising finding has not yet been reported. Further, laminar boundary-layer profiles were compared with the Pohlhausen solution for a flat-wall converging channel and an acceptable agreement was found only for low Reynolds numbers. For turbulent boundary layers, the dependence of the shape factor on relative Mach numbers at a distance of one momentum thickness from the nozzle wall resembles Spence’s prediction. Finally, the calculated total pressure loss coefficient was found to depend on the nozzle-exit Reynolds number for the laminar nozzle-exit boundary layer, while for the turbulent exit boundary layer this coefficient appears to be constant.

Copyright © 1992 by The American Society of Mechanical Engineers
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