Preprints
https://doi.org/10.5194/wes-2024-42
https://doi.org/10.5194/wes-2024-42
12 Apr 2024
 | 12 Apr 2024
Status: this preprint is currently under review for the journal WES.

Effect of Blade Inclination Angle for Straight Bladed Vertical Axis Wind Turbines

Laurence Boyd Morgan, Abbas Kazemi Amiri, William Leithead, and James Carroll

Abstract. Vertical Axis Wind Turbines (VAWTs) have received renewed research interest in the offshore environment due to a number of design synergies that have the potential to decrease the cost of energy for offshore wind. Many studies have been completed on the rotor design for straight bladed (H) rotors however there is sparse information on the effect of blade inclination angle on VAWT aerodynamic performance, and the optimal blade design of VAWTs with inclined blades (V-rotors) for maximum power capture.

This paper presents a systematic study into the effect of blade inclination angle, chord distribution, and blade length on VAWT performance. In the case of fixed chord length blades, it is found that significant power gains are available through blade inclination, between 10 % and 68 %, dependent on blade length. This is driven by the increase in rotor swept area. Further investigation indicates that despite this, under maximum blade stress limitations the most economical solution for fixed chord length blades are H-rotors.

Optimal chord distributions to maximise the rotor power coefficient are then obtained, and a natural blade taper is observed. Significant power gains, between 10 % and 69 % dependent on blade length, are observed through blade inclination. However, consideration must be taken to limit blade mass. For a given power rating, whilst satisfying limitations on maximum blade root bending stress, it is found that blade volume can be reduced between 9 % and 42 % dependent on blade length, and rotor torque can be reduced between 3 % and 9 %. This indicates the potential of V-rotors to reduce the cost of energy compared to H-rotors in traditional VAWT designs. Additionally, inclined blades are shown to increase the operational tip speed ratio, demonstrating their applicability to turbines using secondary rotors, such as the X-Rotor.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Laurence Boyd Morgan, Abbas Kazemi Amiri, William Leithead, and James Carroll

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2024-42', Anonymous Referee #1, 29 Apr 2024
  • RC2: 'Comment on wes-2024-42', Anonymous Referee #2, 01 May 2024
Laurence Boyd Morgan, Abbas Kazemi Amiri, William Leithead, and James Carroll
Laurence Boyd Morgan, Abbas Kazemi Amiri, William Leithead, and James Carroll

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Short summary
This paper presents a systematic study into the effect of blade inclination angle, chord distribution, and blade length on vertical axis wind turbine performance. It is shown that for rotors of identical power production, both blade volume and rotor torque can be significantly reduced through the use of aerodynamically optimised inclined rotor blades. This demonstrates the potential of V-Rotors to reduce the cost of energy for offshore wind when compared to H-Rotors.
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