Study on the Aerodynamic Noise Characteristics of Ultra-high Electricity Transmission Tower
The ultra-high electricity transmission tower plays an important role in ensuring the daily life of residents and industrial production.Due to its extremely high height,the aerodynamic noise problem caused by wind cannot be ignored.In this paper,the CFD(Computational Fluid Dynamics)simulation model is established to solve the problem of disturbing residents caused by aerodynamic noise of ultra-high electricity transmission tower.The standard k-ε turbulent equation is used to calculate the initial steady flow field,and the large eddy simulation method and FW-H acoustic analogy method are respectively used to calculate the transient flow field and aerodynamic noise.With the obtained results,the wind flow around the tower and aerodynamic noise characteristics of the flow field are analyzed.The results show that the left and right sides of four main longitudinal beams and the elevator shaft have strong pressure pulsations,which are the main sound sources.The maximum value appears in the top area of the elevator shaft.The total sound pressure level of each measuring point increases first and then decreases along the height,and the change of the total sound pressure level along the height is jointly controlled by the wind speed and the tower structures' geometric parameters.The position of the sound source above the middle of the tower and below the cross arm,which is obtained through CFD and aeroacoustics simulations,is verified by acoustic imaging.Furthermore,there is a strong correlation between the noise caused by the wind flow around the tower and the wind speed.The research on aerodynamic noise characteristics of ultra-high electricity transmission tower presented in this paper has practical significance for the noise reduction design of the transmission tower.
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