Influences of Manufacturing Tolerances and Surface Roughness of Blades on the Performance of Turbines

[+] Author and Article Information
K. Bammert, H. Sandstede

Institute for Turbomachinery and Gas Dynamics, University of Hanover, Germany

J. Eng. Power 98(1), 29-36 (Jan 01, 1976) (8 pages) doi:10.1115/1.3446107 History: Received December 02, 1974; Online July 14, 2010


The costs of the manufacturing of turbine blades are very dependent on the manufacturing tolerances and the quality of the surface. A good performance of a turbine needs a certain smoothness of the surface and small tolerances. For an optimisation of the costs it is necessary to know the influences of roughness and tolerances on the performance of a turbine. In our institute measurements were carried out with thinned and thickened blades mounted in a turbine, which represents different manufacturing tolerances. In addition measurements on a turbine with roughened blades were done. From these measurements a conclusion on the aerodynamical and thermodynamical behavior of the turbine is obtained. The paper gives a summary of the measurements and shows how the performance of a turbine is affected by the roughness and the profile tolerances.

Copyright © 1976 by ASME
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