【摘要】：相隔一定距離的兩個同向旋渦相互誘導(dǎo)而形成繞中點旋轉(zhuǎn)的渦對,進而誘發(fā)流噪聲。該文基于不可壓縮流場提供的非穩(wěn)態(tài)流動信息,采用黏聲分離法研究水流場中旋轉(zhuǎn)渦對的聲學(xué)特性。計算結(jié)果同理論值進行比較,并探討了計算條件對計算穩(wěn)定性和準(zhǔn)確性的影響。計算結(jié)果表明:在選取合適的計算參數(shù)(人工阻尼、網(wǎng)格尺寸和時間步長)的情況下,黏聲分離法方法適用于預(yù)測水流噪聲。對不可壓縮旋轉(zhuǎn)渦對的聲場特性進行分析,得到旋轉(zhuǎn)渦對聲壓圖案類似四極子,在遠(yuǎn)場接近圓柱波;隨著旋轉(zhuǎn)馬赫數(shù)的增加,聲壓級增大。
[Abstract]:Two codirectional vortices separated at a certain distance induce each other to form a pair of vortices rotating around the center point and then induce flow noise. Based on the unsteady flow information provided by incompressible flow field, the acoustic characteristics of rotating vortex pairs in water flow field are studied by viscoacoustic separation method. The calculated results are compared with the theoretical values, and the effects of calculation conditions on the stability and accuracy of the calculations are discussed. The results show that the visco-acoustic separation method is suitable for predicting water flow noise under the condition of selecting appropriate calculation parameters (artificial damping mesh size and time step). By analyzing the sound field characteristics of the incompressible rotating vortex pair, it is found that the sound pressure pattern of the rotating vortex pair is similar to that of a quadrupole, which is close to the cylindrical wave in the far field, and the sound pressure level increases with the increase of the rotating Mach number.
【作者單位】： 中國艦船研究設(shè)計中心;華中科技大學(xué)土木工程與力學(xué)學(xué)院;
【分類號】：O352

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