基于减小气泡直径的水下排气降噪技术

Research on underwater exhaust noise reduction technology based on microbubbles

气体在水下排放时会产生较大的噪声,影响水下装置的工作性能。气体在水下排放过程中形成的气泡直径大小,是影响噪声的一个重要因素。本文通过气泡生成器排气以及通过水流冲刷的方法,减小水下排气气泡的直径,通过高速显微摄像和水下排气噪声测量试验,研究了水下排气过程中气泡生成的过程、不同排气气泡直径对噪声的影响。试验结果表明,采用气泡生成器以及通过水流冲刷的方法可以有效减小水下排气时气泡的直径,降低排气噪声;采用水流冲刷的方法可以降低低频噪声,但是流速增大时,高频噪声会随之增大。

When the gas is discharged underwater,it will produce large noise and affect the working performance of the underwater device.The bubble diameter formed in the process of underwater emission is an important factor affecting the noise.In this paper,the diameter of underwater exhaust bubbles is reduced by means of bubble generator exhaust and water flow scouring.Through high-speed micrograph and underwater exhaust noise measurement experiments,the process of bubble formation in the process of underwater exhaust and the influence of different exhaust bubble diameters on noise are studied.The experimental results show that the bubble generator and the method of water flow scouring can effectively reduce the bubble diameter and exhaust noise.The low-frequency noise can be reduced by flow scouring,but the high-frequency noise will increase with the increase of flow velocity.