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Unsteady flows in axial turbomachines

Rannie, W. Duncan and Marble, Frank E. (1957) Unsteady flows in axial turbomachines. .

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Of the various unsteady flows that occur in axial turbomachines certain asymmetric disturbances, of wave length large in comparison with blade spacing, have become understood to a certain extent. These disturbances divide themselves into two categories: self-induced oscillations and forced disturbances. A special type of propagating stall appears as a self-induced disturbance; an asymmetric velocity profile introduced at the compressor inlet constitutes a forced disturbance. Both phenomena have been treated from a unified theoretical point of view in which the asymmetric disturbances are linearized and the blade characteristics are assumed quasi-steady. Experimental results are in essential agreement with this theory wherever the limitations of the theory are satisfied. For the self-induced disturbances and the more interesting examples of the forced disturbances, the dominant blade characteristic is the dependence of total pressure loss, rather than the turning angle, upon the local blade inlet angle.

Item Type:Report or Paper (Working Paper)
Additional Information:© 1957. This work was performed in part with financial sponsorship of the Office of Naval Research, Contract Nonr 220(23), NR 097-001 and in part with financial sponsorship of the Office of Scientific Research, U.S. Airforce, Contract AF 18(600)-1728.
Group:Guggenheim Jet Propulsion Center
Funding AgencyGrant Number
Office of Naval Research (ONR)Nonr 220(23)
Office of Naval Research (ONR)NR 097-00
Air Force Office of Scientific Research (AFOSR)AF 18(600)-1728
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Other Numbering System NameOther Numbering System ID
Guggenheim Jet Propulsion Center UNSPECIFIED
Record Number:CaltechAUTHORS:20110204-111252490
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22018
Deposited On:09 Feb 2011 16:24
Last Modified:03 Oct 2019 02:33

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