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An Analysis of the Viscous Flow Through a Compact Radial Turbine by the Average Passage Approach FREE

[+] Author Affiliations
James D. Heidmann

National Aeronautics and Space Administration, Cleveland, OH

Timothy A. Beach

Sverdrup Technology, Inc., Cleveland, OH

Paper No. 90-GT-064, pp. V001T01A023; 11 pages
doi:10.1115/90-GT-064
From:
  • ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Brussels, Belgium, June 11–14, 1990
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7904-7
  • Copyright © 1990 by ASME

abstract

A steady, three-dimensional viscous “average passage” computer code is used to analyze the flow through a compact radial turbine rotor. The code models the flow as spatially periodic from blade passage to blade passage. Results from the code using varying computational models are compared with each other and with experimental data. These results include blade surface velocities and pressures, exit vorticity and entropy contour plots, shroud pressures, and spanwise exit total temperature, total pressure, and swirl distributions. The three computational models used are inviscid, viscous with no blade clearance, and viscous with blade clearance. It is found that modeling viscous effects improves correlation with experimental data, while modeling hub and tip clearances further improves some comparisons. Experimental results such as a local maximum of exit swirl, reduced exit total pressures at the walls, and exit total temperature magnitudes are explained by interpretation of the flow physics and computed secondary flows. Trends in the computed blade loading diagrams are similarly explained.

Copyright © 1990 by ASME
This article is only available in the PDF format.

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