Off-Design Transition and Separation Behavior of a CDA Cascade

[+] Author and Article Information
W. Steinert, H. Starken

Institut für Antriebstechnik, DLR, Köln, Federal Republic of Germany

J. Turbomach 118(2), 204-210 (Apr 01, 1996) (7 pages) doi:10.1115/1.2836627 History: Received February 26, 1994; Online January 29, 2008


The design of modern axial flow compressor blade sections as well as the code validation require experimental information about the transition and separation behavior of blade surface boundary layers. The experience has shown in the past that such information has to be obtained on the whole surface and not only by point measurements because both transition and separation may be of a three-dimensional nature even in a straight cascade. Therefore, a new visualization technique based on Liquid Crystals (LC), showing the adiabatic wall temperature, has been developed. With this method, transition, local separation, and complete separation can be detected. Design and off-design data of a subsonic (M1 = 0.62) Controlled Diffusion Airfoil (CDA) compressor cascade measured in a wind tunnel are presented. The LC results are supplemented by ink-injection tests and overall performance data.

Copyright © 1996 by The American Society of Mechanical Engineers
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