2012 Fiscal Year Final Research Report
Non-equilibrium of disk-type flow contraction
| Project/Area Number |
22560189
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Tokyo University of Marine Science and Technology |
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Principal Investigator |
MASAHIRO Osakabe 東京海洋大学, 海洋科学技術研究科, 教授 (00204173)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 臨界流 / 二相流 / 熱的非平衡 / 絞り機構 / 安全弁 |
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| Research Abstract |
The safety or relief valves to depressurize the pressure vessel are recognized as the most important safety devices for boiler and nuclear facilities. The discharging flow is usually restricted with the minimum flow area between disk and seat. The flow rate is significantly affected with the vena contraction at minimum flow area, the delay of expansion and the non-equilibrium. The simple disk-type flow contraction was fabricated to measure the discharging flow rate at different valve lifts, disk materials and seat configurations. A lot of knowledge such as the significant non-equilibrium was obtained from the comparison of the experimental results with the flow model.
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