Predictions of Endwall Losses and Secondary Flows in Axial Flow Turbine Cascades

[+] Author and Article Information
O. P. Sharma, T. L. Butler

Engineering Division, Pratt & Whitney Aircraft Group, East Hartford, CT 06108

J. Turbomach 109(2), 229-236 (Apr 01, 1987) (8 pages) doi:10.1115/1.3262089 History: Received February 14, 1986; Online November 09, 2009


This paper describes the development of a semi-empirical model for estimating end-wall losses. The model has been developed from improved understanding of complex endwall secondary flows, acquired through review of flow visualization and pressure loss data for axial flow turbomachine cascades. The flow visualization data together with detailed measurements of viscous flow development through cascades have permitted more realistic interpretation of the classical secondary flow theories for axial turbomachine cascades. The re-interpreted secondary flow theories together with integral boundary layer concepts are used to formulate a calculation procedure for predicting losses due to the endwall secondary flows. The proposed model is evaluated against data from published literature and improved agreement between the data and predictions is demonstrated.

Copyright © 1987 by ASME
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