| Far-Field Noise Induced by Bubble near Free Surface |
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| 作者姓名： | YE Xi LI Jiang-tao LIU Jian-hu CHEN Hai-long |
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| 作者单位： | Marine Design & Research Institute of China, Shanghai 200011, China,Marine Design & Research Institute of China, Shanghai 200011, China,Marine Design & Research Institute of China, Shanghai 200011, China,Harbin Engineering University, Harbin 150001, China |
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| 基金项目： | This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51679044 and 51479041). |
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| 摘 要： | The motion of a bubble near the free surface is solved by the boundary element method based on the linear wave equation, and the influence of fluid compressibility on bubble dynamics is analyzed. Based on the solution of the bubble motion, the far-field radiation noise induced by the bubble is calculated using Kirchhoff moving boundary integral equation, and the influence of free surface on far-field noise is researched. As the results, the oscillation amplitude of the bubble is weakened in compressible fluid compared with that in incompressible fluid, and the free surface amplifies the effect of fluid compressibility. When the distance between the bubble and an observer is much larger than that between the bubble and free surface, the sharp wave trough of the sound pressure at the observer occurs. With the increment of the distance between the bubble and free surface, the time of the wave trough appearing is delayed and the value of the wave trough increase. When the distance between the observer and the bubble is reduced, the sharp wave trough at the observer disappears.
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| 关 键 词： | bubble free surface compressibility far-field noise |
| 收稿时间： | 2016/11/13 0:00:00 |
| 修稿时间： | 2017/5/27 0:00:00 |
Far-Field Noise Induced by Bubble near Free Surface |
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| YE Xi,LI Jiang-tao,LIU Jian-hu,CHEN Hai-long.Far-Field Noise Induced by Bubble near Free Surface[J].Ocean Engineering,2018,32(1):26-31. |
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| Authors: | YE Xi LI Jiang-tao LIU Jian-hua and CHEN Hai-long |
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| Institution: | Marine Design & Research Institute of China, Shanghai 200011, China,Marine Design & Research Institute of China, Shanghai 200011, China,Marine Design & Research Institute of China, Shanghai 200011, China and Harbin Engineering University, Harbin 150001, China |
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| Abstract: | The motion of a bubble near the free surface is solved by the boundary element method based on the linear wave equation, and the influence of fluid compressibility on bubble dynamics is analyzed. Based on the solution of the bubble motion, the far-field radiation noise induced by the bubble is calculated using Kirchhoff moving boundary integral equation, and the influence of free surface on far-field noise is researched. As the results, the oscillation amplitude of the bubble is weakened in compressible fluid compared with that in incompressible fluid, and the free surface amplifies the effect of fluid compressibility. When the distance between the bubble and an observer is much larger than that between the bubble and free surface, the sharp wave trough of the sound pressure at the observer occurs. With the increment of the distance between the bubble and free surface, the time of the wave trough appearing is delayed and the value of the wave trough increase. When the distance between the observer and the bubble is reduced, the sharp wave trough at the observer disappears. |
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| Keywords: | bubble free surface compressibility far-field noise |
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