亚临界雷诺数圆柱绕流远场气动噪声实验研究

发布时间：2018-11-22 18:59

【摘要】：针对亚临界雷诺数下圆柱绕流的气动噪声问题,在北京航空航天大学D5气动声学风洞中进行了圆柱绕流远场气动噪声的实验研究。在D5气动声学风洞实验段不同来流条件下,测量消声室中距离圆柱不同位置的自由场传声器的远场声压信号,经过快速傅里叶变换(FFT)获得亚临界雷诺数下圆柱绕流气动噪声随来流速度、接收点距离的变化规律。实验结果表明:圆柱绕流的远场气动噪声在垂直气流方向最大,随着偏离垂直方向角度的增大噪声逐渐减小,属于典型的偶极子噪声源辐射特性;远场气动噪声近似与来流速度的6次方成正比,与接收点到圆柱中心距离的2次方成反比,这说明偶极子类型的噪声源是圆柱绕流的主要噪声源。
[Abstract]:In order to solve the aerodynamic noise problem of cylindrical flow at subcritical Reynolds number, the far field aerodynamic noise of cylindrical flow in D5 aerodynamic acoustic wind tunnel of Beijing University of Aeronautics and Astronautics (BUAA) has been studied experimentally. The far-field acoustic pressure signals of free-field microphones from different positions of the cylinder in the silencing chamber were measured under different incoming flow conditions in the D5 aerodynamic wind tunnel experimental section. After fast Fourier transform (FFT), the variation of aerodynamic noise along the flow velocity and the distance between the receiving point and the flow around a cylinder at subcritical Reynolds number is obtained. The experimental results show that the far field aerodynamic noise around the cylinder is the largest in the vertical flow direction, and the noise decreases gradually with the increase of the deviation from the vertical direction, which is a typical dipole noise source radiation characteristic. The far field aerodynamic noise is directly proportional to the sixth power of the incoming velocity and inversely proportional to the distance from the receiving point to the center of the cylinder, which indicates that the dipole type noise source is the main noise source of the cylinder.
【作者单位】：北京航空航天大学航空科学与工程学院;
【基金】：国家自然科学基金(11272034)~~
【分类号】：O357.5

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