Heat Transfer and Flow Phenomena in a Swirl Chamber Simulating Turbine Blade Internal Cooling

[+] Author and Article Information
C. R. Hedlung, P. M. Ligrani

Convective Heat Transfer Laboratory, Department of Mechanical Enginering; University of Utah, Salt Lake City, UT 84112

H.-K. Moon, B. Glezer

Solar Turbines Inc., Turbine Cooling Design and Analysis, San Diego, CA 92186

J. Turbomach 121(4), 804-813 (Oct 01, 1999) (10 pages) doi:10.1115/1.2836734 History: Received February 01, 1998; Online January 29, 2008


Heat transfer and fluid mechanics results are given for a swirl chamber whose geometry models an internal passage used to cool the leading edge of a turbine blade. The Reynolds numbers investigated, based on inlet duct characteristics, include values that are the same as in the application (18,000–19,400). The ratio of absolute air temperature between the inlet and wall of the swirl chamber ranges from 0.62 to 0.86 for the heat transfer measurements. Spatial variations of surface Nusselt numbers along swirl chamber surfaces are measured using infrared thermography in conjunction with thermocouples, energy balances, digital image processing, and in situ calibration procedures. The structure and streamwise development of arrays of Görtler vortex pairs, which develop along concave surfaces, are apparent from flow visualizations. Overall swirl chamber structure is also described from time-averaged surveys of the circumferential component of velocity, total pressure, static pressure, and the circumferential component of vorticity. Important variations of surface Nusselt numbers and time-averaged flow characteristics are present due to arrays of Görtler vortex pairs, especially near each of the two inlets, where Nusselt numbers are highest. Nusselt numbers then decrease and become more spatially uniform along the interior surface of the chamber as the flows advect away from each inlet.

Copyright © 1999 by The American Society of Mechanical Engineers
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