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RESEARCH PAPERS

High-Temperature Potential of Uncooled Radial Turbines

[+] Author and Article Information
D. J. Arnold

Structural Sciences Research, Inc., Los Angeles, Calif.

O. E. Balje

Sherman Oaks, Calif.

J. Eng. Power 100(2), 294-302 (Apr 01, 1978) (9 pages) doi:10.1115/1.3446349 History: Received December 17, 1976; Online July 14, 2010

Abstract

Radial turbines are used predominantly for turbo-charges where the geometry is frequently compromised to favor low fabrications costs. Theoretical as well as experimental investigations have shown that the efficiency potential of radial turbines is as high as the efficiency potential of high reaction axial turbines. Structural and heat transfer studies on radial turbines show that the highest stresses in “deep scalloped” radial rotors occur at locations where the metal temperature is considerably lower than at rotor inlet. Thus the maximum allowable gas inlet temperature for radial turbines is several hundred degrees higher than for high-reaction axial turbines. This difference tends to increase with increasing expansion ratios, at least up to expansion ratios of 10:1. Since the thermal efficiency of typical gas turbine cycles increases with increasing gas temperatures and increasing expansion ratios, it results that the application of uncooled radial turbines will yield cycle efficiencies which are not obtainable with uncooled axial turbines.

Copyright © 1978 by ASME
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