水下潜器首部声基阵区流噪声研究方法

水下潜器在航行过程中,主要使用声呐来探测敌方舰艇以及自身位置.主声呐一般安放在潜艇首部位置,可分为主动声呐与被动声呐.在探测目标时,噪声是2种声呐系统都必须克服的干扰因素.针对自噪声中的流噪声,首先使用LES模型对水下潜器的外流场进行仿真计算.在获得流场中的脉动压力分布后,将其导入基于Lighthill声类比理论的声学软件ACTRAN中进行声场仿真计算,实现了对水下潜器首部声基阵区流噪声的数值预报.研究了航速、共形阵的安装位置和基阵单元安装面形状对声基阵区流噪声传播的影响.结果表明:航速越大,流噪声越大;增大声呐安装面与导流罩的距离以及使用较光滑的安装面,可以减小声基阵区流噪声的大小.

Research method about flow-induced noise in the bow of underwater vehicles

Underwater vehicle use sonar system to detect the enemy ship as well as its own position during its naviga-tion. The main sonar system which can be divided into active sonar and passive sonar is usually placed in the bow. However, noise is an important interference factor that both systems must overcome. In order to research flow-induced noise in the bow, the LES model was applied to simulate flow field out of the underwater vehicle to get fluctuating pressure. Then the fluctuating pressure was import into ACTRAN- a software based on Lighthill's acoustic analogy theory- to simulate the sound field in the bow. Speed, position of the array and shape of the array carrier were studied to reveal their influences on the propagation of flow-induced noise. The results show thatthe higher speed, the bigger of flow-induced noise. Furthermore, flow-induced noise can be diminished by increasing the distance between sonar array and dome and using relative smooth in-stallion surface.