Some research vessels set moonpools for sonars installation. The moonpool provides a relatively good working environment for sonar in a harsh marine environment. At the same time, other acoustic detection equipment are installed along the ship bottom behind the moonpool. Due to the exist of the sonar with a variable cross-section, the number of bubbles generated in the moonpool increases. The bubbles generated in the moonpool expel and flow along the vessel bottom to the stern, which leads to the sweepdown effect. The performance of the sonar and other acoustic detection equipment degrades by the bubbles around. However, the research on reducing bubble generation in the moonpool and sweepdown effects is rare. So in present paper the reduction effects of damping devices such as the flange and choke deck on the bubble generation in the moonpool are investigated experimentally. Then, in order to reduce the sweepdown effects of bubbles on the ship bottom, three other damping devices which are double flaps, diversion channel and wedge are investigated. It can be seen that through reducing the area of bubble leakage in the moonpool the distribution position of bubbles can be effectively restricted and the width and thickness of the bubbles reduce.

一些研究船为声纳安装设置了月池。在恶劣的海洋环境中，月池为声纳提供了相对良好的工作环境。同时，沿月池后面的船底安装了其他声音检测设备。由于存在具有可变横截面的声纳，所以在月池中产生的气泡数量增加了。月球池中产生的气泡排出并沿着船底流到船尾，从而导致扫掠作用。声纳和其他声音检测设备的性能会因周围的气泡而降低。但是，关于减少月池中气泡的产生和降落效应的研究很少。因此，本文通过实验研究了减震装置（如法兰和节流板）对月池中气泡产生的减少作用。然后，为了减少气泡对船底的倾倒作用，研究了另外三种阻尼装置，即双瓣，导流通道和楔形。可以看出，通过减小月池中的气泡泄漏面积，可以有效地限制气泡的分布位置，并且可以减小气泡的宽度和厚度。