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Wind and Structures Volume 22, Number 5, May 2016 , pages 595-616 DOI: https://doi.org/10.12989/was.2016.22.5.595 |
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Numerical study of airfoil thickness effects on the performance of J-shaped straight blade vertical axis wind turbine |
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Mahdi Zamani, Mohammad Javad Maghrebi and Sajad A. Moshizi
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| Abstract | ||
| Providing high starting torque and efficiency simultaneously is a significant challenge for vertical axis wind turbines (VAWTs). In this paper, a new approach is studied in order to modify VAWTs performance and cogging torque. In this approach, J-shaped profiles are exploited in the structure of blades by means of eliminating the pressure side of airfoil from the maximum thickness toward the trailing edge. This new profile is a new type of VAWT airfoil using the lift and drag forces, thereby yielding a better performance at low TSRs. To simulate the fluid flow of the VAWT along with J-shaped profiles originated from NACA0018 and NACA0030, a two-dimensional computational analysis is conducted. The Reynolds Averaged Navier-Stokes (RANS) equations are closed using the two-equation Shear Stress Transport (SST) turbulence model. The main objective of the study is to investigate the effects of J-shaped straight blade thickness on the performance characteristics of VAWT. The results obtained indicate that opting for the higher thickness in J-shaped profiles for the blade sections leads the performance and cogging torque of VAWT to enhance dramatically. | ||
| Key Words | ||
| VAWT; J-shaped Profile; thickness; numerical simulation; cogging torque | ||
| Address | ||
| Mahdi Zamani and Mohammad Javad Maghrebi: Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran Sajad A. Moshizi: Sun–Air Research Institute, Ferdowsi University of Mashhad, Mashhad, Iran | ||