Numerical analyses and acoustic experiments were performed to investigate the effects of geometric parameters on the hydro-acoustic characteristics of flow over cylinders with circular, square and rectangular cross sections, respectively. A hybrid method which combines RANS and FWH equations was applied for the numerical analyses. The hydro-acoustic characteristics were obtained for circular cylinders with diameters, \(D = 9.5\), 19.0, 38.0 and 65.0 mm, respectively, and aspect ratios, \(L/D = 2.5\), 5.0 and 10.0. The effects of side-ratio, B/H, on the hydro-acoustic characteristics were investigated for cylinders with rectangular cross sections, for \(B/H = 0.3\), 0.6, 1.0, 1.8 and 3.0, respectively. The range of Reynolds numbers considered for the numerical analyses and experiments is in the range of \(2.25\times 10^{4}\) and \(1.7\times 10^{5}\). It was observed that the hydro-acoustic characteristics are greatly affected by the shear layer separation, reattachment mechanism and intensity disturbances. The noise spectrum strongly depends on the cross-sectional geometry of cylinder. An increase in the side ratio causes the spectrum to be narrower, and the main peak frequency increases with reducing side ratio. At constant Reynolds numbers, the broadband noise level and maximum sound pressure level decrease with decreasing aspect ratio, L/D, for cylinders with circular cross section. Moreover, the main peak frequency decreases with increasing diameter, whereas aspect ratio has no effect. The increase in diameter results in a decrease in the broadband noise level and the maximum sound pressure level. The numerical predictions were compared with experimental measurements, and a good agreement was found between the results.

进行了数值分析和声学实验，分别研究了几何参数对圆形、方形和矩形横截面圆柱体的水声特性的影响。将 RANS 和 FWH 方程相结合的混合方法应用于数值分析。对于直径分别为\(D = 9.5\)、19.0、38.0 和 65.0 mm 和纵横比\(L/D = 2.5\)、5.0 和 10.0的圆柱体，获得了水声特性。对于具有矩形横截面的圆柱体，研究了侧比B / H对水声特性的影响，其中\(B/H = 0.3\), 0.6, 1.0, 1.8 和 3.0，分别。用于数值分析和实验的雷诺数范围在\(2.25\times 10^{4}\)和\(1.7\times 10^{5}\)的范围内。据观察，水声特性受剪切层分离、重新附着机制和强度扰动的影响很大。噪声谱很大程度上取决于圆柱体的横截面几何形状。边比的增加导致频谱变窄，主峰频率随着边比的减小而增加。在恒定雷诺数下，宽带噪声级和最大声压级随着纵横比L / D的减小而降低, 对于具有圆形横截面的圆柱体。此外，主峰频率随着直径的增加而降低，而纵横比没有影响。直径的增加导致宽带噪声级和最大声压级降低。将数值预测与实验测量值进行了比较，发现结果之间具有良好的一致性。