2016 Fiscal Year Final Research Report
Nonlinear Acoustic Theory toward a Transformation Technique from Shock Wave into Soliton by Active Control of Bubble Oscillations in Water
| Project/Area Number |
26820040
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Fluid engineering
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 気泡流 / 気泡力学 / 非線形音響学 / 非線形波動 / 衝撃波 / ソリトン / 音響ソリトン / 分散性波動 |
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| Outline of Final Research Achievements |
Shock waves sometimes are observed in an inner flow of fluid machinery (e.g., pumps) and recognized as a risk factor. The aim of this study is to establish a theoretical basis of a transformation technique from shock wave into soliton that leads to suppress the damage to pumps. A fast propagation mode with the phase velocity of 1,500 m/s of pressure waves induced by the consideration of compressibility of liquid phase in liquids containing many spherical gas bubbles is focused. This attention is essential from the viewpoint of a rapid elimination of a dangerous wave in pumps. The nonlinear evolution equations were then theoretically derived via the method of multiple scales and numerically solved via a finite difference method. An experimental verification and incorporation of abovementioned results into future pumps will be carried out.
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| Free Research Field |
流体力学
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