Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30054
Multi-Objective Optimization of a Steam Turbine Stage

Authors: Alvise Pellegrini, Ernesto Benini


The design of a steam turbine is a very complex engineering operation that can be simplified and improved thanks to computer-aided multi-objective optimization. This process makes use of existing optimization algorithms and losses correlations to identify those geometries that deliver the best balance of performance (i.e. Pareto-optimal points). This paper deals with a one-dimensional multi-objective and multi-point optimization of a single-stage steam turbine. Using a genetic optimization algorithm and an algebraic one-dimensional ideal gas-path model based on loss and deviation correlations, a code capable of performing the optimization of a predefined steam turbine stage was developed. More specifically, during this study the parameters modified (i.e. decision variables) to identify the best performing geometries were solidity and angles both for stator and rotor cascades, while the objective functions to maximize were totalto- static efficiency and specific work done. Finally, an accurate analysis of the obtained results was carried out.

Keywords: Steam turbine, optimization, genetic algorithms.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF


[1] Singiresu S. Rao, Engineering Optimization: Theory and Practice, 2009, John Wiley & Sons, Inc., Hoboken, New Jersey
[2] E. Benini, G. Boscolo, A. Garavello, 2008, Assessment of loss correlations for performance prediction of low reaction gas turbine stages, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE08, Boston, Massachusetts, USA, IMECE2008-69085, 2008
[3] D. G. Ainley and. G. C. R. Mathieson, 1951, A Method of Performance Estimation for Axial-Flow Turbines, A.R.C. R.&M. No. 2974, Great Britain
[4] H. R. M. Craig and H. J. A. Cox, 1971, Performance estimation of axial flow turbines, Proceedings Institution of Mechanical Engineers, 1970- 1971, v. 185, 32/71, Great Britain
[5] Sandrolini Sandro and Naldi Giovanni, Macchine 2: Le turbomacchine motrici e operatrici, 1996, Pitagora editrice, Bologna (ITA), ISBN: 88- 371-0827-3.