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Efficient Aerodynamic Optimization of an Impulse Turbine Rotor Cascade

[+] Author Affiliations
Ernesto Benini, Rita Ponza, Claudio Comis da Ronco, Irene Ventrucci

University of Padova, Padova, Italy

Paper No. IMECE2009-10115, pp. 841-851; 11 pages
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME


This paper describes an efficient aerodynamic optimization method for an impulse turbine rotor cascade. The aim of the optimization is to minimize the total pressure losses through the cascade by controlling the shape of a portion of the turbine airfoil, i.e. the pressure side and the rear part of the suction side. This is done with the intention of reducing the complexity of the problem to be solved, as well as because of the particular nature of the losses being generated. For this purpose, the commercial Computational Fluid Dynamics (CFD) code Fluent© is used where a transition model is implemented, prior an accurate validation has been carried out. A proper optimization procedure is developed which is based on a sequential use of several modules: first, a Design of Experiment (DOE) analysis is performed, then a Response Surface Methodology (RSM) is employed to build a surrogate model of the fitness function, which is in turn minimized using a Sequential Quadratic Programming (SQP) algorithm. The benefits of this approach are demonstrated, in that the total pressure coefficient of the cascade can be lowered up to 13%.

Copyright © 2009 by ASME



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