Nonlinear aeroelastic modelling for wind turbine blades based on blade element momentum theory and geometrically exact beam theory

Lin Wang, Xiongwei Liu, Nathalie Renevier, Matthew Stables, George M. Hall

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Due to the increasing size and flexibility of large wind turbine blades, accurate and reliable aeroelastic modelling is playing an important role for the design of large wind turbines. Most existing aeroelastic models are linear models based on assumption of small blade deflections. This assumption is not valid anymore for very flexible blade design because such blades often experience large deflections. In this paper, a novel nonlinear aeroelastic model for large wind turbine blades has been developed by combining BEM (blade element momentum) theory and mixed-form formulation of GEBT (geometrically exact beam theory). The nonlinear aeroelastic model takes account of large blade deflections and thus greatly improves the accuracy of aeroelastic analysis of wind turbine blades. The nonlinear aeroelastic model is implemented in COMSOL Multiphysics and validated with a series of benchmark calculation tests. The results show that good agreement is achieved when compared with experimental data, and its capability of handling large deflections is demonstrated. Finally the nonlinear aeroelastic model is applied to aeroelastic modelling of the parked WindPACT 1.5MW baseline wind turbine, and reduced flapwise deflection from the nonlinear aeroelastic model is observed compared to the linear aeroelastic code FAST (Fatigue, Aerodynamics, Structures, and Turbulence).

Original languageEnglish
Pages (from-to)487-501
Number of pages15
JournalEnergy
Volume76
Early online date19 Sep 2014
DOIs
Publication statusPublished - 1 Nov 2014
Externally publishedYes

Keywords

  • Aeroelastic model
  • BEM (Blade element momentum)
  • GEBT (Geometrically exact beam theory)
  • Large blade deflections
  • Nonlinear
  • Wind turbine blade

ASJC Scopus subject areas

  • Pollution
  • Energy(all)

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