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RESEARCH PAPERS

The Development of a Second Generation of Controlled Diffusion Airfoils for Multistage Compressors

[+] Author and Article Information
R. F. Behlke

Commercial Engineering, Pratt & Whitney, United Technologies Corporation, East Hartford, CT 06108

J. Turbomach 108(1), 32-40 (Jul 01, 1986) (9 pages) doi:10.1115/1.3262020 History: Received May 06, 1985; Online November 09, 2009

Abstract

The evolution of Controlled Diffusion Airfoils is traced from inception of the theoretical design model to demonstration of significant performance gains at engine operating conditions in a multistage compressor rig. The proven aerodynamic benefits and versatility of first-generation Controlled Diffusion Airfoil blade elements are extended to the endwall flow region using an Integrated Core/Endwall Vortex design model to produce a new full-span optimized second-generation Controlled Diffusion design. Highlighted are the essential roles of extensive cascade, low-speed, large-scale, and high Mach number compressor rig testing in developing and substantiating the second-generation Controlled Diffusion technology resulting in a 1.5 percent increase in efficiency and 30 percent increase in surge-free operation relative to first-generation Controlled Diffusion Airfoils.

Copyright © 1986 by ASME
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