International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Numerical optimization of Wells turbine for wave energy extraction

  • Halder, Paresh (Wave Energy and Fluid Engineering Laboratory, Department of Ocean Engineering, Indian Institute of Technology Madras) ;
  • Rhee, Shin Hyung (Research Institute of Marine Systems Engineering, Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Samad, Abdus (Wave Energy and Fluid Engineering Laboratory, Department of Ocean Engineering, Indian Institute of Technology Madras)
  • Received : 2016.05.05
  • Accepted : 2016.06.27
  • Published : 2017.01.31
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Abstract

The present work focuses multi-objective optimization of blade sweep for a Wells turbine. The blade-sweep parameters at the mid and the tip sections are selected as design variables. The peak-torque coefficient and the corresponding efficiency are the objective functions, which are maximized. The numerical analysis has been carried out by solving 3D RANS equations based on k-w SST turbulence model. Nine design points are selected within a design space and the simulations are run. Based on the computational results, surrogate-based weighted average models are constructed and the population based multi-objective evolutionary algorithm gave Pareto optimal solutions. The peak-torque coefficient and the corresponding efficiency are enhanced, and the results are analysed using CFD simulations. Two extreme designs in the Pareto solutions show that the peak-torque-coefficient is increased by 28.28% and the corresponding efficiency is decreased by 13.5%. A detailed flow analysis shows the separation phenomena change the turbine performance.

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