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RESEARCH PAPERS

The Effect of Rotor Blade Thickness and Surface Finish on the Performance of a Small Axial Flow Turbine

[+] Author and Article Information
R. J. Roelke

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135

J. E. Haas

Propulsion Laboratory, AVRADCOM Research and Technology Laboratories, Lewis Research Center, Cleveland, Ohio 44135

J. Eng. Power 105(2), 377-382 (Apr 01, 1983) (6 pages) doi:10.1115/1.3227426 History: Received December 15, 1981; Online September 28, 2009

Abstract

An experimental investigation was conducted to determine the effect of blade profile inaccuracies and surface finish on the aerodynamic performance of a 11.15-cm tip dia turbine. The as-received cast rotor blades had a significantly thicker profile than the design intent and a fairly rough surface finish. Stage test results showed an increase of one point in efficiency by smoothing the surface finish and another three points by thinning the blade profiles to near the design profile. Most of the performance gain between the as-cast thick and the thinned rotor blades, both with the same surface finish, was attributed to reduced trailing edge losses of the recontoured blades.

Copyright © 1983 by ASME
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