Efficiency Prediction for Axial-Flow Turbines Operating with Nonconventional Fluids

[+] Author and Article Information
E. Macchi, A. Perdichizzi

Istituto di Macchine, Politecnico di Milano, 20133 Milano, Italy

J. Eng. Power 103(4), 718-724 (Oct 01, 1981) (7 pages) doi:10.1115/1.3230794 History: Received December 01, 1980; Online September 28, 2009


The need for a simple and reliable method for predicting the efficiency of a turbine stage without carrying out a detailed aerodynamic design is enhanced. The results of an optimization study carried on a large number of turbine stages are presented. The turbine stage efficiency is found to be a function of three main parameters: the expansion ratio, defined as the specific volume variation across the turbine in an isentropic process; the dimensional parameter out/Δhis 1/4 , which accounts for actual turbine dimensions, and the specific speed. The presented method is believed to be useful mainly for nonconventional turbine stages, the efficiency of which cannot be anticipated on previous machines experience.

Copyright © 1981 by ASME
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