An Experimental Study of Endwall and Airfoil Surface Heat Transfer in a Large Scale Turbine Blade Cascade

[+] Author and Article Information
R. A. Graziani

Commercial Products Division, Pratt & Whitney Aircraft Group, United Technologies Corporation, East Hartford, CT 06108

M. F. Blair

United Technologies Research Center

J. R. Taylor

CPD, Pratt & Whitney Aircraft, United Technologies Corporation

R. E. Mayle

Rensselaer Polytechnic Institute; Pratt & Whitney Aircraft, East Hartford, Connecticut

J. Eng. Power 102(2), 257-267 (Apr 01, 1980) (11 pages) doi:10.1115/1.3230246 History: Received December 18, 1978; Online September 28, 2009


Local rates of heat transfer on the endwall, suction, and pressure surfaces of a large scale turbine blade cascade were measured for two inlet boundary layer thicknesses and for a Reynolds number typical of gas turbine engine operation. The accuracy and spatial resolution of the measurements were sufficient to reveal local variations of heat transfer associated with distinct flow regimes and with regions of strong three-dimensional flow. Pertinent results of surface flow visualization and pressure measurements are included. The dominant role of the passage vortex, which develops from the singular separation of the inlet boundary layer, in determining heat transfer at the endwall and at certain regions of the airfoil surface is illustrated. Heat transfer on the passage surfaces is discussed and measurements at airfoil midspan are compared with current finite difference prediction methods.

Copyright © 1980 by ASME
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