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RESEARCH PAPERS

Friction Drag on Bladed Disks in Housings as a Function of Reynolds Number, Axial and Radial Clearance, and Blade Aspect Ratio and Solidity

[+] Author and Article Information
Robert W. Mann

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass.

Charles H. Marston

Dynamic Analysis and Control Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass.

J. Basic Eng 83(4), 719-723 (Dec 01, 1961) (5 pages) doi:10.1115/1.3662307 History: Received January 31, 1961; Online November 04, 2011

Abstract

Extra losses from partial admission operation of a gas turbine occur both in the nozzle flow arc and away from it. The latter have been related to the theory of fluid flow over a rotating disk expressing a dimensionless moment coefficient as a function of Reynolds number. By direct measurements of drag torque, the moment coefficient has been determined over a range of Reynolds number from 2.0 × 104 to 4.5 × 106 for several aspect ratios, axial and radial shroud clearances, and solidities. Losses increase with increasing aspect ratio. Small increases from minimum practical clearance have little effect, but blade pumping losses become severe at radial and axial clearances of the order of half the disk radius. Typical changes in solidity have only small effects on losses.

Copyright © 1961 by ASME
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