Simulation Sound Velocity Of Bubble Film In Wake

The study of wakes not only can be used to the detection and analysis of the performance of the ship, but also can be applied to the other objected, which can generate wakes, such as fish and so on. The bubble film’s acoustic characteristics in wakes is analyzed through the hydrodynamic theory in this paper, the whole process of bubble film from formed to oblivion is simulated in the following works. Bubble-proportion of the wakes is calculated and analyzed in the second part. At last the sound speed in the bubble film is measured by the way of phase-interferometry. And then the relationship between the bubble-proportion and speed of sound are analyzed in the bubble film. The theoretical is provided, which basis for the acoustic measurements of bubble-proportion and the fish finding in this paper.The study has important military and civilian value of providing important theoretical basis for discussing the use of acoustic detection or fish finding by wakes. Research foundation is built for the acoustic wake-homing torpedoes, fish finding and tracking. The main contents of this paper include the following aspects.Firstly, the self-developed wakes generating device is used to generate the bubble film, thereby establishing a theoretical model, and then the bubble in the bubble film is analyzed and researched in the model which we established, And through studying on the process of the bubbles floating and annihilation, bubbles floating time is calculated by hydrodynamic theory. At last the bubble-proportion in the bubble film is calculated. The result is get as follow, the bubble proportion increased from0.115to0.155, the speed of sound within the bubble film down from1812.90m/s to1500.97m/s.Secondly, the impact for the different parameters of the bubble film in wakes is analyzed by adjusting the parameters of the bubble film in wakes.Thirdly, the speed of sound is measured in simulated bubble film by phase interferometry. In this paper, different conditions are simulated for different area of the sea in the world. Then the experimental data will be widely used in the future.