Boundary Layer and Loss Measurements on the Rotor of an Axial-Flow Turbine

[+] Author and Article Information
H. P. Hodson

Whittle Laboratory, University of Cambridge, Cambridge, England CB3 005

J. Eng. Gas Turbines Power 106(2), 391-399 (Apr 01, 1984) (9 pages) doi:10.1115/1.3239576 History: Received November 24, 1982; Online October 15, 2009


The aerodynamic efficiency of an axial-flow turbine is significantly less than that predicted by measurements made on equivalent cascades which operate with steady inflow. This difference in efficiencies is strongly dependent upon the rotor-stator axial spacing. An experimental investigation of the rotor-stator interaction has therefore been conducted using a large-scale, low-speed turbine. The blade profile loss and surface shear stresses are presented for the midspan of the rotor and for a rectilinear cascade of identical geometry. Both wind tunnels were operated at a Reynolds number of 3.15 × 105 . The turbine rotor midspan profile loss was approximately 50 percent higher than that of the rectilinear cascade. The shear stress measurements indicate that as a stator wake is connected through a rotor passage, the laminar boundary layers undergo transition in the vicinity of the wake. The 50 percent increase in loss is due to the time-dependent transitional nature of the boundary layers.

Copyright © 1984 by ASME
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