不可压缩旋转涡对的流噪声计算研究
发布时间：2018-08-28 19:08
【摘要】：相隔一定距离的两个同向旋涡相互诱导而形成绕中点旋转的涡对,进而诱发流噪声。该文基于不可压缩流场提供的非稳态流动信息,采用黏声分离法研究水流场中旋转涡对的声学特性。计算结果同理论值进行比较,并探讨了计算条件对计算稳定性和准确性的影响。计算结果表明:在选取合适的计算参数(人工阻尼、网格尺寸和时间步长)的情况下,黏声分离法方法适用于预测水流噪声。对不可压缩旋转涡对的声场特性进行分析,得到旋转涡对声压图案类似四极子,在远场接近圆柱波;随着旋转马赫数的增加,声压级增大。
[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.
【作者单位】： 中国舰船研究设计中心;华中科技大学土木工程与力学学院;
【分类号】：O352
本文编号：2210333
[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.
【作者单位】： 中国舰船研究设计中心;华中科技大学土木工程与力学学院;
【分类号】：O352
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