Optimization of hydraulic turbine diffuser
1 Victor Kaplan Dept. of Fluid Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Czech Republic
2 Dept. of Mathematical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Czech Republic
a Corresponding author: Prokop.Moravec@seznam.cz
Published online: 28 March 2016
Hydraulic turbine diffuser recovers pressure energy from residual kinetic energy on turbine runner outlet. Efficiency of this process is especially important for high specific speed turbines, where almost 50% of available head is utilized within diffuser. Magnitude of the coefficient of pressure recovery can be significantly influenced by designing its proper shape. Present paper focuses on mathematical shape optimization method coupled with CFD. First method is based on direct search Nelder-Mead algorithm, while the second method employs adjoint solver and morphing. Results obtained with both methods are discussed and their advantages/disadvantages summarized.
© Owned by the authors, published by EDP Sciences, 2016
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