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Feasibility Study of Re-Design of the Wells Turbine for Small Amplitude Ocean Waves Energy Conversion to Electricity by Analytical Method and Numerical Simulation

Valizadeh, Reza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52237 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Taeibi Rahni, Mohammad; Abbaspour, Madjid
  7. Abstract:
  8. In this research, the feasibility of the usage of the Wells turbine for direct conversion of the hydro-mechanical energy of the surface waves is studied via analytical and numerical methodologies. The results produced, showed for the first time that the Wells turbine can be employed for such waves directly and the performance variables are quite reasonable and even efficient considering low cost of HKWT system and abundant availability of those waves. For the low-frequency waves, the turbine is tested for different wave velocities to discover the best angular velocity of the rotor in terms of performance and the rotational velocity of 300 RPM has been found to be the optimum amount. Further, the IfS62TR marine foil which has indicated to have a more massive lift and better resistance against separation in comparison with the NACA profiles was tested for the first time in the Wells turbine application. The performance of 6 different blade designs, FSB20, BSB20, CTB20, VTB20, CTB25 and VTB25 with having IfS62TR and NACA as their blade's sectional foil were evaluated and compared via a validated three dimensional CFD technique. The operational span and the maximum torque generation for the VTB20 design were seen as the maximum among other designs by 24.1% and 71% respectively. Therefore, the VTB20IfS62TR as a better lift generative and stall resisting design than the last designs offered by the recent efforts on enhancing the Wells turbine performance was suggested for further studies and usage in the Wells turbine applications
  9. Keywords:
  10. Sloshing ; Wells Turbine ; Oscillating Water Column System ; Computational Fluid Dynamics (CFD) ; Waterwave Energy ; Energy Conversion ; Numerical Simulation

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