【摘要】：針對亞臨界雷諾數(shù)下圓柱繞流的氣動噪聲問題,在北京航空航天大學D5氣動聲學風洞中進行了圓柱繞流遠場氣動噪聲的實驗研究。在D5氣動聲學風洞實驗段不同來流條件下,測量消聲室中距離圓柱不同位置的自由場傳聲器的遠場聲壓信號,經(jīng)過快速傅里葉變換(FFT)獲得亞臨界雷諾數(shù)下圓柱繞流氣動噪聲隨來流速度、接收點距離的變化規(guī)律。實驗結(jié)果表明:圓柱繞流的遠場氣動噪聲在垂直氣流方向最大,隨著偏離垂直方向角度的增大噪聲逐漸減小,屬于典型的偶極子噪聲源輻射特性;遠場氣動噪聲近似與來流速度的6次方成正比,與接收點到圓柱中心距離的2次方成反比,這說明偶極子類型的噪聲源是圓柱繞流的主要噪聲源。
[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.
【作者單位】： 北京航空航天大學航空科學與工程學院;
【基金】：國家自然科學基金(11272034)~~
【分類號】：O357.5

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