Preprints
https://doi.org/10.5194/wes-2021-60
https://doi.org/10.5194/wes-2021-60

  22 Jun 2021

22 Jun 2021

Review status: this preprint is currently under review for the journal WES.

Parked and Operating Loads Analysis in the Aerodynamic Design of Multi-megawatt-scale Floating Vertical Axis Wind Turbines

Mohammad Sadman Sakib and D. Todd Griffith Mohammad Sadman Sakib and D. Todd Griffith
  • The University of Texas at Dallas, Richardson, TX, 75080, USA

Abstract. A good understanding of aerodynamic loading is essential in the design of vertical axis wind turbines (VAWTs) to properly capture design loads and to estimate the power production. This paper presents a comprehensive aerodynamic design study for a 5 MW Darrieus offshore VAWT in the context of multi-megawatt floating VAWTs. This study systematically analyzes the effect of different, important design variables including the number of blades (N), aspect ratio (AR) and blade tapering in a comprehensive loads analysis of both the parked and operating aerodynamic loads including turbine power performance analysis. Number of blades (N) is studied for 2- and 3-bladed turbines, aspect ratio is defined as ratio of rotor height (H) and rotor diameter (D) and studied for values from 0.5 to 1.5, and blade tapering is applied by means of adding solidity to the blades towards blade root ends, which affects aerodynamic and structural performance. Analyses were carried out using a three-dimensional vortex model named CACTUS (Code for Axial and Crossflow TUrbine Simulation) to evaluate both instantaneous azimuthal parameters as well as integral parameters, such as loads (thrust force, lateral force, and torque loading) and power. Parked loading is a major concern for VAWTs, thus this work presents a broad evaluation of parked loads for the design variables noted above. This study also illustrates that during the operation of a turbine, lateral loads are on par with thrust loads, which will significantly affect the structural sizing of rotor and platform & mooring components.

Mohammad Sadman Sakib and D. Todd Griffith

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-60', Claudio Balzani, 14 Oct 2021 reply

Mohammad Sadman Sakib and D. Todd Griffith

Mohammad Sadman Sakib and D. Todd Griffith

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Short summary
This work presents a comprehensive aerodynamic design study of a large scale 5MW VAWT using a vortex based aerodynamic model named CACTUS. Impact of various important design parameters like rotor solidity, number of blades and rotor aspect ratio on loading and power have been analyzed. VAWTs typically suffer from large variation in cyclic loads and they are subjected to high parked loads, which are addressed in this study.