The problems caused by the cavitation bubble and caused many adverse effects on the ship propeller, hydraulic machinery and equipment. In order to research the production mechanism of cavitation bubble under different conditions, cavitation bubble zone parameter fine measurement and analysis technology is indispensable, this paper adopts a non-contact measurement method of optical autonomous construction of binocular stereo vision measurement system according to the characteristics of cavitation bubble, the texture features are not clear, transparent and difficult to obtain, 3D imaging measurement of cavitation bubble using composite dynamic lighting, and 3D reconstruction of cavitation bubble region and obtained the characteristics of more accurate parameters, test results show that the cavitation bubble characteristics of the fine technology can obtain and analyze cavitation bubble region and instability.
The theoretical model of single bubble movement in an ideal solution, to carry on the numerical simulation of the process of cavitation in the liquid, the liquid in different laser energy, laser induced cavitation rules and acoustic characteristics were studied by high-speed camera, high frequency measurements of the hydrophone. The results show that with the increase of laser energy, the period of bubble pulsation and the maximum bubble radius increase gradually, and the amplitude of the laser acoustic signal becomes larger.
KEYWORDS: Acoustics, Laser energy, Liquids, Pulsed laser operation, Cavitation, Signal processing, High power lasers, High speed cameras, Wave propagation, Analytical research
Measurements and investigation were made on the development process and the radiated acoustic wave signal of the two-bubble which is generated by high-power laser reacting with liquid, using the high-speed camera and the high-frequency measurement hydrophone. The result from analysis shows that, the reduced distance between two bubbles and increased laser energy applied on them cause increased interaction between two bubbles resulting in graduallyy prolonged period of two-bubble collapse and gradually increased pressure of cavitated acoustic wave; at the same time, with increasing distance between bubbles, the interacting force between bubbles disappears and both bubbles takes on the characteristics of a single bubble.
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