Recent Development in the Design of Wind Deflectors for Vertical Axis Wind Turbine: A Review

Altaf Hussain Rajpar, Imran Ali, Ahmad E. Eladwi and Mohamed Bashir Ali Bashir
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Altaf Hussain Rajpar: Department of Mechanical Engineering, College of Engineering, Jouf University, Sakaka 42421, Saudi Arabia
Imran Ali: Electrical and Electronics Engineering Department, Faculty of Engineering, Universiti Malaysia Sarawak, Sarawak 94300, Malaysia
Ahmad E. Eladwi: Department of Mechanical Engineering, College of Engineering, Jouf University, Sakaka 42421, Saudi Arabia
Mohamed Bashir Ali Bashir: Department of Mechanical Engineering, College of Engineering, Jouf University, Sakaka 42421, Saudi Arabia

Energies, 2021, vol. 14, issue 16, 1-23

Abstract: Developments in the design of wind turbines with augmentation are advancing around the globe with the goal of generating electricity close to the user in built-up areas. This is certain to help lessen the power generation load as well as distribution and transmission network costs by reducing the distance between the user and the power source. The main objectives driving the development and advancement of vertical-axis wind turbines are increasing the power coefficient and the torque coefficient by optimizing the upstream wind striking on the rotor blades. Unlike horizontal-axis wind turbines, vertical axis turbines generate not only positive torque but also negative torque during operation. The negative torque generated by the returning blade is a key issue for vertical-axis wind turbines (VAWTs) that is counterproductive. Installation of wind deflectors for flow augmentation helps to reduce the negative torque generated by the returning blades as well as enhance the positive torque by creating a diversion in the upstream wind towards the forwarding blade during operation. This paper reviews various designs, experiments, and CFD simulations of wind deflectors reported to date. Optimization techniques for VAWTs incorporating wind deflectors are discussed in detail. The main focus of the review was on the installation position and orientation of the deflectors and their potential contribution to increasing the power coefficient. Topics for future study are suggested in the conclusion section of the paper.

Keywords: wind deflector; VAWT; wind turbine optimization; flow augmentation; small wind energy; aerodynamic-enhancement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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