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Wind and Structures Volume 33, Number 6, December 2021 , pages 471-480 DOI: https://doi.org/10.12989/was.2021.33.6.471 |
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Aerodynamic analysis of cambered blade H-Darrieus rotor in low wind velocity using CFD |
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Anal Ranjan Sengupta, Agnimitra Biswas and Rajat Gupta
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| Abstract | ||
| This present paper leads to investigation of blade-fluid interactions of cambered blade H-Darrieus rotor having EN0005 airfoil blades using comprehensive Computational Fluid Dynamics (CFD) analysis to understand its performance in low wind streams. For several blade azimuthal angle positions, the effects of three different low wind speeds are studied regarding their influence on the blade-fluid interactions of the EN0005 blade rotor. In the prevailing studies by various researchers, such CFD analysis of H-Darrieus rotors are very less, hence it is needed to improve their steady-state performance in low wind velocities. Such a study is also important to obtain important performance insights of such thin cambered blade rotor in its complete rotational cycle. It has been seen that the vortex generated at the suction side of the EN0005 blade rolls back to its leading edge due to the camber of the blade and thus a peak velocity occurs near to the nose position of this blade at its leading edge, which leads to peak performance of this rotor. Again, in the returning phase of the blade, a secondary recirculating vortex is generated that acts on the pressure side of EN0005 blade rotor that increases the performance of this cambered EN0005 blade rotor in its downstream position as well. Here, the aerodynamic performances have been compared considering Standard k-ω and SST k-ω models to check the better suited turbulence model for the cambered EN0005 blade H-Darrieus rotor in low tip speed ratios. | ||
| Key Words | ||
| blade-fluid interaction; CFD simulation; H-Darrieus rotor; lift coefficient; power coefficient | ||
| Address | ||
| Anal Ranjan Sengupta:Department of Mechanical Engineering, JIS College of Engineering, Kalyani, WB-741235, India Agnimitra Biswas:Department of Mechanical Engineering, NIT Silchar, Assam-788010, India Rajat Gupta:Department of Mechanical Engineering, NIT Mizoram, Mizoram-796012, India | ||