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Conceptual Design of a Helical Blade Turbine to be Used as an Energy Converter from Tidal Currents

Sakhaei, Soroush | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55429 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspour, Majid
  7. Abstract:
  8. Darrieus turbines are one of the most widely used turbines in extracting energy from tidal currents. This study aimed to investigate the effect of utilizing helical blades and variable solidity ratio on the efficiency of Darrieus tidal turbines. For this purpose, three types of helical turbines with different solidity ratios have been designed, and computer simulation has been used to investigate the effect of the mentioned parameters on the efficiency of the Darrieus turbines. According to the simulation results, the helical turbine has less efficiency than the straight blade Darrieus turbine. The maximum hydrodynamic efficiency of the Darrieus turbine with straighted blades is 38.5, helical turbine with fixed solidity ratio distribution is 26.2, helical turbine with linear decreasing solidity ratio distribution is 25.5, and helical turbine with parabolic solidity ratio distribution is 36.9. Utilizing a helical turbine reduces the amplitude and frequency of the turbine output torque. A linear solidity ratio distribution in a helical turbine reduces the amplitude and frequency of the torque fluctuations. Value engineering analysis shows that the helical turbine with linear decreasing solidity ratio distribution has the highest score for extract energy from tidal currents between the turbines studied in this study
  9. Keywords:
  10. Darrieus Turbine ; Computational Fluid Dynamics (CFD) ; Renewable Energy Resources ; Tidal Power ; Hydrokinetic Turbine ; Helical Turbine

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