| Project/Area Number |
24560292
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Intelligent mechanics/Mechanical systems
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| Research Institution | Gifu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Minoru 岐阜大学, 工学部, 教授 (20183379)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Keywords | 円管噴流 / 臨界レイノルズ数 |
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| Outline of Final Research Achievements |
A round jet penetrating into the same fluid-filled circular pipe with both axes coincident with each other is a simplified model of the restrictor in hydraulic actuators. Our study have been related to investigate the flow stability by the flow visualization and hot-wire measurement. The round jet is issued in parallel with the pipe axis through a circular nozzle. The collapse position of the jet column was transported upstream with increasing Rej. At Rej = 700 - 900, the collapse position of the jet column fluctuated pseudo-periodically. At Rej > 1000, a vortex ring rolled up periodically and the collapse position of the jet column was stable. As shown in the measurement results of the hot wire at the position of x/d = 5.5, at Rej = 1100 and 1300, there appeared the fluctuations that have large amplitude and long period. This fluctuation might be caused by a return flow upstream from the downstream portion. This return flow could be observed as dye streak images.
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