An Experimental Study on the Improvement of a 2-Bladed and 3-Bladed Conventional Savonius Rotors with a Deflector for Hydrokinetic Application

Authors

  • Mohd Badrul Salleh School of Aerospace Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia
  • Noorfazreena M. Kamaruddin School of Aerospace Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia
  • Zulfaa Mohamed-Kassim School of Aerospace Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia
  • Elmi Abu Bakar School of Aerospace Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia

Keywords:

deflector, experimental study, savonius rotor, performance, hydrokinetic turbine

Abstract

An experimental investigation has been performed to investigate the effect of a deflector on the power performance of a 2-bladed and 3-bladed conventional Savonius rotors which has not been covered in the previous studies. The rotors were tested inside a closed-circuit wind tunnel at 10 m/s of air flow velocity (equivalent to 0.57 m/s of water flow velocity) at a Reynolds number of 90200. Two cases were considered in the investigation: a 2-bladed and 3-bladed rotor, each tested without and with a deflector at an angle (?) of 60°. The performance of the rotors was analyzed in terms of coefficient of power (????????) and coefficient of torque (????????)with respect to the tip speed ratio (????). Results showed that the presence of the deflector significantly improved the performance of both rotors. Without any deflector, ???????? for the 3-bladed rotor was slightly lower than that of the 2-bladed rotor. This reduction is caused by a cascading effect on the flows induced by the extra blade. When augmented, ???????? for the 2-bladed and 3-bladed rotors increased by 128.36% and 604.62%, respectively. Such significant improvements, especially on the 3-bladed rotor were attained as the cascading effect on the returning blades reduced. The deflector functioned by shielding the returning blade of the rotor from impinged by the incoming flow. Without any augmentation device, the unobstructed flow would have dragged the blades in the opposing direction and thus reducing the positive torques generated by the rotors. This study highlighted the practicality of using a simple flat deflector as an augmentation device to enhance the power performance of a Savonius rotor for hydrokinetic application.

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Published

2020-12-29

How to Cite

Salleh, M. B. ., M. Kamaruddin, N. ., Mohamed-Kassim, Z. ., & Abu Bakar, E. . (2020). An Experimental Study on the Improvement of a 2-Bladed and 3-Bladed Conventional Savonius Rotors with a Deflector for Hydrokinetic Application. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 67(1), 93–104. Retrieved from https://www.akademiabaru.com/submit/index.php/arfmts/article/view/2839
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