无叶片风力机捕能柱涡激摆动气动噪声分析  

Aerodynamic Noise Analysis of Vortex-induced Swing Vibration of Energy Capturing Column in Bladeless Wind Turbines

作　　者：龚曙光[1] 李志 谢桂兰[1] 卢海山 GONG Shuguang;LI Zhi;XIE Guilan;LU Haishan(School of Mechanical Engineering,Xiangtan University,Xiangtan 411105,Hunan,China)

机构地区：[1]湘潭大学机械工程学院,湖南湘潭411105

出　　处：《噪声与振动控制》2022年第5期1-5,20,共6页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51875493)。

摘　　要：针对基于涡激振动无叶片风力机的气动噪声问题,建立捕能柱涡激横向摆动的仿真模型并进行验证,结合SST湍流模型和声类比法,探讨来流风速对捕能柱横向摆动噪声及远场噪声辐射的影响。结果表明,捕能柱涡激摆动产生的噪声为低频噪声,且噪声大小与其摆动角度和频率有关;捕能柱涡激摆动的气动声源为偶极子声源;最大噪声位于捕能柱中段位置,且捕能柱底部的噪声要大于其顶端;辐射噪声声压级与漩涡脱落频率存在对应关系;当来流风速处于锁频风速区间时噪声最大,且其衰减率小于非锁频风速。所得结论可为无叶片风力机的设计与安装提供指导。Aiming at the aerodynamic noise problem of bladeless wind turbine induced by vortex-induced swing vibration(VISV), the simulation model of vortex-induced transverse swing of the energy capturing column(ECC) was established and verified. Combining the SST turbulence model with the acoustic analogy method, the influence of the incoming wind speed on the noise of the transverse swing and the far-field noise radiation of the ECC was discussed. The results show that the noise generated by VISV of the ECC is low frequency noise, and the noise size is related to the vibration angle and frequency. The aerodynamic sound source of VISV of the ECC is a dipole sound source. The maximum noise happens in the middle of the ECC, and the noise at the bottom of the ECC is greater than that at the top. There exists a corresponding relationship between sound pressure level of radiated noise and vortex shedding frequency. When the incoming wind speed is in the frequency-locked wind speed range, the noise is the largest, and its attenuation rate is less than that of the non-frequency-locked wind speed. The conclusions can provide a guidance for the design and installation of bladeless wind turbines.

关 键 词：声学 无叶片风力机 涡激横向摆动 气动噪声 摆动频率 远场噪声 

分 类 号：TB533[理学—物理]