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RESEARCH PAPERS

The Off-Design Performance of a Low-Pressure Turbine Cascade

[+] Author and Article Information
H. P. Hodson, R. G. Dominy

Whittle Laboratory, University of Cambridge, Cambridge, United Kingdom

J. Turbomach 109(2), 201-209 (Apr 01, 1987) (9 pages) doi:10.1115/1.3262086 History: Received February 10, 1986; Online November 09, 2009

Abstract

The ability of a given blade profile to operate over a wide range of conditions is often of the utmost importance. This paper reports the off-design performance of a low-pressure turbine rotor root section in a linear cascade. Data were obtained using pneumatic probes and surface flow visualization. The effects of incidence (+9, 0, −20 deg), Reynolds (1.5, 2.9, 6.0 × 105 ), pitch-chord ratio (0.46, 0.56, 0.69), and inlet boundary layer thickness (0.011, 0.022 δ*/C ) are discussed. Particular attention is paid to the three dimensionality of the flow field. Significant differences in the detail of the flow occur over the range of operating conditions investigated. It is found that the production of new secondary loss is greatest at lower Reynolds numbers, positive incidence, and the higher pitch-chord ratios.

Copyright © 1987 by ASME
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