水舱表面开孔特征参数流噪声特性分析

水下航行体因表面开孔产生的流噪声是总体噪声的重要部分，对其隐蔽性造成负面影响，而其噪声特性影响因素较多，开孔长宽比是其中一个典型参数。在现有阻力试验模型的基础上建立模型，采用 RANS结合DES方法获得流场数据，并运用FW-H方程获得其声场信息。分析艇体开孔水舱内的流动现象，表明模型噪声的特征频率符合一般空腔规律，且与开孔长度有关；在长宽比为0.25时，其流噪声水平最低。最后结合简化模型作进一步验证。

Research on the acoustic characteristic caused by flood ports on underwater vehicle tank

The acoustics generated by the flood port on the wall of underwater vehicles is an important part of the entire noise, do harm to the stealth performance. This article studies the influence of the ratio L/B of the flood port on the cabin. Based on the experiment model which has the resistance data, it makes the corresponding numerical simulation by the DES method, captures the characteristics of the flow field and the acoustic field. The result shows the eigenfrequency is accordant to general law and relatives to L;at the case of L/B=0.25, the cabin has the lowest acoustics level. Finally, this conclusion is certified on simplified models.