| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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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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