Near-Stall Loss Measurements in a CD Compressor Cascade with Exploratory Leading Edge Flow Control

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Authors
Armstrong, Jeffrey H.
Subjects
Cascade Wind Tunnel Loss Measurement
Controlled DIffusion Blading
Slotting Leading Edge
Advisors
Shreeve, Raymond P.
Date of Issue
1990-06
Date
June 1990
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Loss measurements were conducted using a five-hole conical pneumatic probe in a subsonic wind tunnel containing a modeled cascade of controlled diffusion (CD) stator blades. Following reference measurements at high incidence one blade was modified (slotted at the leading edge) in an attempt to (passively) reduce the size of the leading edge separation bubble and thereby improve performance. Prior to the surveys, the acquisition and reduction software was modified to provide loss calculations using both mass-averaged and fully-mixed-out conditions for the upstream and downstream flows. Results showed that the mass-averaged method provided the more consistent results, and this was explained. The slotted leading edge blade was found to produce less loss than the reference blade, and it was concluded that the control concept should be explored in more detail.
Type
Thesis
Description
Series/Report No
Department
Department of Aeronautics and Astronautics
Organization
Identifiers
NPS Report Number
Sponsors
Funder
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Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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