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Numerical investigation of the structural response of a heaving airfoil subjected to oscillatory flow and parametric excitation
Rodolfo Curci Puraca, Guilherme Rosa Franzini, Bruno Souza Carmo

Last modified: 2018-04-22

Abstract


Wind turbine blades are subjected to oscillatory loads due their rotation. The gravity compresses or tensions the blade depending on its position along the cycle. Due to sheared flow, the wind load also changes in a cyclic way as the blade rotates. This kind of load can lead to fatigue damage. It is possible to analyse some of the fundamentals of this physical phenomenon considering a two-dimensional cross section of the blade, which is an airfoil. This airfoil is allowed to respond in the heaving direction, subjected to oscillatory flow and parametric excitation, due to the variation of the structural characteristics of the blade because of the alternation of compression and tension. In this work, we use numerical simulations to investigate the oscillating flow around an airfoil allowed to translate in the heaving direction, mounted on an elastic base of varying stiffness. The flow and stiffness vary with the same frequency. We employ parameter values that are typical from what is found in wind turbines. The goal is to assess the effect of parametric excitation on the response of the structure to the oscillating aerodynamic load.

Keywords


Parametric excitation; airfoil; wind turbines

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