Nonlinear Frequency Domain Solution Method for Aerodynamic and Aeromechanical Analysis of Wind Turbines

Naung, Shine Win, Rahmati, Mohammad and Farokhi, Hamed (2021) Nonlinear Frequency Domain Solution Method for Aerodynamic and Aeromechanical Analysis of Wind Turbines. Renewable Energy, 167. pp. 66-81. ISSN 0960-1481

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Official URL: https://doi.org/10.1016/j.renene.2020.11.046

Abstract

A feature of a modern aeronautical Low-Pressure Turbine (LPT) is the high blade loadings with complex, transient and separated flow regimes. Most existing research have focused only on analysing the transient flow and flow separation in such turbines. The aerodynamics of a modern LPT, however, can be significantly influenced by the interaction between the unsteady flow field and the blade structure motion in a complex non-linear fashion which could lead to aeroelastic instabilities such as flutter. Therefore, the understanding of the mechanism of the interaction between the flow field unsteadiness and the blade structure in a modern LPT is essential to examine the vibration stress levels to ensure the blade mechanical integrity. The novelty of this paper, first and foremost, is using a high-fidelity direct numerical simulation method to explore the mechanism of flutter and forced response in a modern LPT, T106A turbine, and to study the effects of various sources of unsteadiness on the aeroelastic instabilities of the blade. Secondly, this paper investigates and identifies the adequate working ranges of the harmonic balance method, which has been widely used for the aeromechanical analysis of turbomachines, on predicting the behaviour of the highly unsteady flow due to fluid-structure interaction in an LPT. Another emphasis of this paper is the determination of the capability of the Unsteady Reynolds Averaged Navier–Stokes (URANS) model for the aeroelasticity analysis of an LPT involving the highly unsteady flow. This paper will bridge a key gap in the knowledge of aeroelasticity modelling and analysis of modern LPTs.

Item Type: Article
Uncontrolled Keywords: Wind turbines, Inflow wakes, Aerodynamics, Aeroelasticity, Computational fluid dynamics, Nonlinear frequency domain method
Subjects: H100 General Engineering
H300 Mechanical Engineering
H400 Aerospace Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 01 Dec 2020 09:57
Last Modified: 02 Feb 2021 11:30
URI: http://nrl.northumbria.ac.uk/id/eprint/44874

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