0
research-article

Load Mitigation using Slotted Flaps in Offshore Wind Turbines

[+] Author and Article Information
Shilpa Thakur

Department of Ocean Engineering, Indian Institute of Technology - Madras, Chennai 600 036, India
thakur.shilpa2989@gmail.com

K A Abhinav

Department of Ocean Engineering, Indian Institute of Technology - Madras, Chennai 600 036, India
abhinavka@gmail.com

Nilanjan Saha

M. ASME, Department of Ocean Engineering, Indian Institute of Technology - Madras, Chennai 600 036, India
nilanjan@iitm.ac.in

1Corresponding author.

ASME doi:10.1115/1.4040234 History: Received October 24, 2017; Revised May 02, 2018

Abstract

This paper focuses on load mitigation by implementing controllable trailing-edge slotted flaps on the blades of an offshore wind turbine (OWT). The benchmark NREL 5-MW horizontal axis OWT is subjected to coupled stochastic aerodynamic-hydrodynamic analysis for obtaining the responses. The OWT is supported on three different fixed bottom structures situated in various water depths. Blade element momentum (BEM) theory and Morison's equation are used to compute the aerodynamic and hydrodynamic loads, respectively. Presently, the load reduction obtained by means of the slotted flaps are regulated using an external dynamic link library (DLL) considering the proportional - integral -derivative (PID) controller. BEM theory is presently modified to account for unsteady effects of flaps along the blade span. The present analysis results show reduction up to 20% in blade and tower loads for the turbine with different support structures on implementing controllable trailing edge flaps. This study can form the basis for evaluating the performance of large-scale fixed OWT rotors.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In