基于叶片弯振后风轮尾迹流动及气动噪声研究
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摘要
基于动网格技术,通过编写UDF代码成功实现了叶片的一阶弯振及一二阶叠加弯振。数值模拟过程中,采用大涡模拟(LES)分析刚性叶片与低阶弯振后风轮近尾迹速度与涡量特征。运用FW-H方程,以风轮表面为声源面,通过选取不同测试线上的监测点分析叶片不同运动状态下辐射声频谱及声压级变化。研究结果表明:施加振动后,在0.71R处出现轴向速度亏损,且在叶尖位置亏损最大;振动风轮整体噪声增大。文章通过研究模拟振动风轮的尾迹流动和噪声分析,为实际运行的风力机产生的气动噪声及声辐射传播特性提供一定参考。
Based on the dynamic mesh technique, through the successful implementation of UDF code of the blade low-order vibration wave, the numerical simulation process using the large eddy simulation(LES), analysis of rigid blade and waving the vibration characteristics of wind turbines near wake velocity and vorticity, the use of FW-H equation, the selection of wind turbines for sound source on the surface, by choosing different test online monitoring analysis of blade sound radiation spectrum under different motion state and the change of sound pressure level. The results show that the velocity loss and the overall noise of the wind wheel increase at 0.71 R after vibration is applied. By studying the wake flow and noise analysis of the simulated vibration wind turbine,this paper provides some references for the aerodynamic noise and acoustic radiation propagation characteristics of the wind turbine.
Based on the dynamic mesh technique, through the successful implementation of UDF code of the blade low-order vibration wave, the numerical simulation process using the large eddy simulation(LES), analysis of rigid blade and waving the vibration characteristics of wind turbines near wake velocity and vorticity, the use of FW-H equation, the selection of wind turbines for sound source on the surface, by choosing different test online monitoring analysis of blade sound radiation spectrum under different motion state and the change of sound pressure level. The results show that the velocity loss and the overall noise of the wind wheel increase at 0.71 R after vibration is applied. By studying the wake flow and noise analysis of the simulated vibration wind turbine,this paper provides some references for the aerodynamic noise and acoustic radiation propagation characteristics of the wind turbine.
引文
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[5]韩宝坤,孙晓东,鲍怀谦,等.大型风力机气动噪声仿真与分析[J].噪声与振动控制,2016,36(2):158-161.
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[8]王晓静,贺玲丽,汪建文,等.小型水平轴风力机翼型气动分析与叶片设计[J].可再生能源,2017,35(4):535-540.
[9]吴光中.FLUENT基础入门与案例精通[M].北京:电子工业出版社,2012.
[10] Kim W,Menon S. An unsteady incompressible NavierStokes solver for large eddy simulation of turbulent flows[J]. International Journal for Numerical Methods in Fluids,2015,31(31):983-1017.
[2] Lenka Dubcová,Miloslav Feistauer,Jaromír Horáˇcek·Petr Sváˇcek. Numerical simulation of interaction between turbulent flow and a vibrating airfoil[J].Compute Visual Sci.,2009,12(5):207-225.
[3] Donald P Rizzetta,Visbal M R. Effect of plasma-based control on low reynolds-number flapping airfoil performance[J]. Aiaa Journal,2015,50(1):131-147.
[4]陈天阁.风轮近尾迹声辐射与流动相关性的实验探索[D].呼和浩特:内蒙古工业大学,2015.
[5]韩宝坤,孙晓东,鲍怀谦,等.大型风力机气动噪声仿真与分析[J].噪声与振动控制,2016,36(2):158-161.
[6]刘海锋,孙凯,胡丹梅.大型风力机尾迹双向流固耦合特性分析[J].可再生能源,2015,33(11):1664-1673.
[7]汪建文,白杨,高志鹰,等.小型风力机风轮叶尖近尾迹区域声辐射测试与分析[J].沈阳工业大学学报,2010(1):27-31.
[8]王晓静,贺玲丽,汪建文,等.小型水平轴风力机翼型气动分析与叶片设计[J].可再生能源,2017,35(4):535-540.
[9]吴光中.FLUENT基础入门与案例精通[M].北京:电子工业出版社,2012.
[10] Kim W,Menon S. An unsteady incompressible NavierStokes solver for large eddy simulation of turbulent flows[J]. International Journal for Numerical Methods in Fluids,2015,31(31):983-1017.