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


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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