On the Influence of the Number of Stages on the Efficiency of Axial-Flow Turbines PUBLIC ACCESS

[+] Author Affiliations
G. Lozza, E. Macchi, A. Perdichizzi

Politecnico di Milano, Milano, Italy

Paper No. 82-GT-43, pp. V001T01A016; 10 pages
  • ASME 1982 International Gas Turbine Conference and Exhibit
  • Volume 1: Turbomachinery
  • London, England, April 18–22, 1982
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7956-6
  • Copyright © 1982 by ASME


The selection of the number of stages of a turbine is a compromise between the two often conflicting requirements of increasing the efficiency and decreasing the machine complexity and cost. A sound prediction of the turbine efficiency variation with the number of stages is therefore useful. In the paper, a computer code capable of optimizing the more significant design variables of a multistage axial-flow turbine is described. The selection of the optimizing design variables, the assumptions made for the constraints within which the solution is searched and the optimization procedure are discussed. Losses are predicted by the Craig and Cox correlation. A computer program is used to design and predict the performance of a number of representative turbines. Similarity parameters are introduced to generalize the obtained results after a discussion of their physical significance for multistage turbine handling compressible flow. The influence on the overall turbine efficiency of the number of stages is derived as a function of expansion ratio, specific speed and turbine dimensions.

Copyright © 1982 by ASME
Topics: Turbines , Axial flow
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