Method for predicting acoustic radiation rule value of noise of wind turbine

Abstract

The invention discloses a method for predicting the acoustic radiation rule value of the noise of a wind turbine. The method comprises the steps of establishing a wind turbine model, defining flow field grids, calculating a flow field based on large eddy simulation and calculating sound field distribution based on the indirect boundary element method. The method is used for predicting the acoustic radiation rule value of the noise of the wind turbine by means of flow field calculation data combined with the boundary element method, with the assistance of software, the calculating processes can be simplified greatly, the prediction process is made simple, the calculating result is accurate, the calculated amount is small, speed is high, and the method has great application value in engineering.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for numerical prediction of the sound radiation law of wind turbine noise. Background technique [0002] The aerodynamic noise of a wind turbine is closely related to the blade airfoil. Predicting its aerodynamic noise based on the experimental research and simulation calculation of the blade airfoil noise can provide convenience for the design of a low-noise wind turbine. The computational fluid dynamics (CFD) method can be used to predict the aerodynamic noise of wind turbines by numerical calculation, but this method is relatively complicated and not yet mature. The noise of the wind turbine can be directly calculated by using the semi-empirical formula based on the test results. Brooks, Pope and Marcolini (NASA Reference Publication 1218, USA: National Aeronautics and Space Administration, 1989, Airfoil self-noise prediction) use the NACA0012 airfoil The airfoil...

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Problems solved by technology

However, the solution of this method requires a lot of computer resources. Although some iterative algorithms have been developed in recent years to reduce the amount of calculation, the amount of calculation is still very large. However, the fast multipole algorithm FMM (Fast multipole method) proposed to solve In recent years, when the traditional Boundary Element Method (BEM) has been encountered, relevant researches have used the Fast Multipole Boundary Element Method to accelerate the solution of the traditional Boundary Element Method, that is, to establish the Fast Multipole Boundary Element Method (FMBEM). In China, this research areas where no progress has been made

In terms of noise radiation propagation at home and abroad, the hybrid computational aeroacoustic method combined with the boundary element method is currently widely used in the aerodynamic noise prediction of the turbomachine opening system, but the hybrid computational aeroacoustic method combined with the boundary element method has not yet been carried out in the calculation of wind turbine noise propagation.

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