Blade tip gap effects in turbomachines: A Review
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Authors
Peacock, R. E.
Subjects
Tip Clearance Losses
Turbomachines
Compressors and Turbines
Turbomachines
Compressors and Turbines
Advisors
Date of Issue
1981-11
Date
1981-11
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A review is presented of experiments examining the effects of blade tip gaps encountered in turbomachines and the methods by which the synthesised data are currently used in turbomachinery design and performance analysis. Data gained since the 1930's is subdivided for convenience into diffusing, or compressor-type flows, and accelerating, or turbine-type flows. There is a further sub-division into cascade and rotating machinery data. The overall trend university is that an increasing tip gap whose effect can reach over most or all of the blade height brings reduced overall performance of a turbomachine. Turbine data are in general more regular than the body of compressor data, possibly due in part to the enhanced effect of, usually, undefined boundary layers in diffusing flow. there is some evidence among the compressor and compressor cascade data that an optimum gap exists when the opposing effects of secondary flows, and tip leakage with rotor/wall relative movement tend to balance. Comment is made upon the prediction and design models published in the literature. (Author)
Type
Technical Report
Description
Series/Report No
Department
Identifiers
NPS Report Number
NPS-67-81-016
Sponsors
Naval Air Systems Command, Washington, D.C.
Funder
N00019-81-WR-11104
Format
NA
Citation
Distribution Statement
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.