Effect of High Free-Stream Turbulence With Large Length Scale on Blade Heat/Mass Transfer

[+] Author and Article Information
H. P. Wang, R. J. Goldstein, S. J. Olson

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

J. Turbomach 121(2), 217-224 (Apr 01, 1999) (8 pages) doi:10.1115/1.2841304 History: Received February 01, 1998; Online January 29, 2008


The naphthalene sublimation technique is used to investigate the influence of high free-stream turbulence with large length scale on the heat/mass transfer from a turbine blade in a highly accelerated linear cascade. The experiments are conducted at four exit Reynolds numbers, ranging from 2.4 × 105 to 7.8 × 105 , with free-stream turbulence of 3, 8.5, and 8 percent and corresponding integral length scales of 0.9 cm, 2.6 cm, and 8 cm, respectively. On the suction surface, the heat/mass transfer rate is significantly enhanced by high free-stream turbulence due to an early boundary layer transition. By contrast, the transition occurs very late, and may not occur at very low Reynolds numbers with low free-stream turbulence. In the turbulent boundary layer, lower heat/mass transfer rates are found for the highest free-stream turbulence level with large length scale than for the moderate turbulence levels with relatively small scales. Similar phenomena also occur at the leading edge. However, the effect of turbulence is not as pronounced in the laminar boundary layer.

Copyright © 1999 by The American Society of Mechanical Engineers
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