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RESEARCH PAPERS

Surface-Curvature-Distribution Effects on Turbine-Cascade Performance

[+] Author and Article Information
T. Korakianitis, P. Papagiannidis

Department of Mechanical Engineering, Washington University, St. Louis, MO 63130

J. Turbomach 115(2), 334-341 (Apr 01, 1993) (8 pages) doi:10.1115/1.2929239 History: Received February 19, 1992; Online June 09, 2008

Abstract

The manufacturing accuracy of turbine blades is judged by the difference between the designed and produced location of each point around the airfoils. This paper shows that the design-point and off-design-point aerodynamic and heat transfer performance of turbine cascades is affected significantly by the distribution of curvature along the suction and pressure surfaces, and less significantly by the exact location of each one point. The performances of turbine blades designed with continuous slope of curvature distribution, and with slight discontinuities in the slope of curvature, are examined using a computer program for various design and off-design flow conditions. The accuracy of the computations is checked by comparison of computational results with cascade solutions of known experimental output. It is concluded that the accuracy in local curvature is Just as important as the design-location-by-manufactured-location accuracy of each point on the blade.

Copyright © 1993 by The American Society of Mechanical Engineers
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