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RESEARCH PAPERS

Spanwise Transport in Axial-Flow Turbines: Part 2—Throughflow Calculations Including Spanwise Transport

[+] Author and Article Information
K. L. Lewis

Whittle Laboratory, University of Cambridge, Cambridge, United Kingdom

J. Turbomach 116(2), 187-193 (Apr 01, 1994) (7 pages) doi:10.1115/1.2928352 History: Received March 10, 1993; Online June 09, 2008

Abstract

In Part 1 of this paper, a repeating stage condition was shown to occur in two low aspect ratio turbines, typically after two stages. Both turbulent diffusion and convective mechanisms were responsible for spanwise transport. In this part, two scaling expressions are determined that account for the influence of these mechanisms in effecting spanwise transport. These are incorporated into a throughflow model using a diffusive term. The inclusion of spanwise transport allows the use of more realistic loss distributions by the designer as input to the throughflow model and therefore focuses attention on areas where losses are generated. In addition, modeling of spanwise transport is shown to be crucial in predicting the attenuation of a temperature profile through a turbine.

Copyright © 1994 by The American Society of Mechanical Engineers
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