| Project/Area Number |
07555307
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
船舶工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KATO Hiroharu Univ.Tokyo, Naval Arch.& Ocean Eng., Prof., 大学院・工学系研究科, 教授 (00010695)
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| Co-Investigator(Kenkyū-buntansha) |
MAEDA Masatsugu Univ.Tokyo, Naval Arch.& Ocean Eng., Assistant, 大学院・工学系研究科, 助手 (60219277)
KOMURA Takashi Univ.Tokyo, Naval Arch.& Ocean Eng., Assistant, 大学院・工学系研究科, 助手 (10010894)
YAMAGUCHI Hajime Univ.Tokyo, Naval Arch.& Ocean Eng., Assoc.Prof., 大学院・工学系研究科, 助教授 (20166622)
MIYATA Hideaki Univ.Tokyo, Naval Arch.& Ocean Eng., Prof., 大学院・工学系研究科, 教授 (70111474)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥17,300,000 (Direct Cost: ¥17,300,000)
Fiscal Year 1997: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1996: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1995: ¥9,000,000 (Direct Cost: ¥9,000,000)
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| Keywords | cavitation / experimant / facility / liquid nitrogen / thermodynamic effect / blow-down / measurement / temperature / Zファクター / 非定常 / 極低温液体 / 臨界点 |
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| Research Abstract |
A new blow-down type cavitation tunnel was designed and constructed in the first year, 1995 where the liquid nitrogen was used to investigate the thermodynamic effect on cavitation. In 1995 and 1996, cavitation in Venturi was investigated and observed the temperature drop of a few degrees which agreed with the prediction by Z-factor method. In 1996 a rectangular test section was constructed to test the cavitation on a two-dimensional convex shape.
The cavitation number at the test section was changed by inserting meshes downstream to produce an intentional pressure drop in the test loop.
The main purpose of the present research is to ihvestigate the possibility and the feasibility of such the blow-down type tunnel, which is much handy and cheaper than the normal type tunnnel.
During the research the feasibility of the tunnel was verified. The problems to be improved were also pointed out.
The test loop including the test section should be filled with the test liquid before the test run, so that the test section is insured in thermal equilibrium condition.
Other problems to be solved were accurate calibration methods of thermometers and pressure gauges, and mal-eunction of the flow meter at very low temperature. The thermal stress and shrinkage of the test loop were other important problem.
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