Based on longitudinal seam in axially symmetrical model of SUBOFF submarine. 2,3.4,5.6,7,8 proportion were amplified. LES large eddy turbulence model was used to numerically simulate the three-dimensional flow field of water holes. By setting different spots of flow noise, calculation results of eight groups scale were compared, flow noise comparison of multi - scale axially symmetrical model, the attenuation characteristics of same distance and position were studied. The results showed that the relationships between change of 8 groups and total noise level are not drab, the more scale a, the smaller; Fully considering the influence of turbulence attached layer, the greater the axially symmetrical scale, the smaller the equidistance attenuation) In the same position flow field, along with the increasing of axially symmetrical scale, flow noise presented first increased, then decreased and increased in the end. The conclusions axially symmetrical model a-bove could provide reference to the design of water holes.%以SUBOFF潜艇回转体纵缝开孔模型为基础,进行2、3、4、5、6、7、8等比例放大,基于LES大涡湍流模型对流水孔三维流场进行数值模拟;通过设置不同的流噪声监测点,将八组尺度计算结果进行对比,研究了回转体多尺度流噪声对比、等距离和等位置的衰减特性;结果表明:8组模型尺度的变化与总声级的关系并不是单调的,总声级随着尺度的变大有变小的趋势；充分考虑湍流附面层的影响,回转体尺度越大,其等距离衰减量越小;在流场相同位置处,随着回转体尺度的增大,流噪声呈现先增大后减小而后再增大的规律;以上结论可为回转体模型流水孔的设计提供参考.
展开▼
