| Project/Area Number |
24656061
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Applied physics, general
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
HORIOKA Kazuhiko 東京工業大学, 総合理工学研究科(研究院), 教授 (10126328)
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| Co-Investigator(Renkei-kenkyūsha) |
NAKAJIMA Mitsuo 東京工業大学, 総合理工学研究科, 助教 (30198098)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 超音速ジェット / プラズマ / ディフューザー / 衝撃波 / デトネーション / 超音速流 / フリージェット / ガスジェット / レーザー / プラズマ光源 / ラバールノズル |
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| Research Abstract |
In order to make a controllable beam target, a hyper-sonic localized jet was formed quasi-continuously in vacuum. An apparatus composed of a miniature Laval nozzle, a gas target chamber, and a supersonic diffuser was constructed for studies on the gas target formation and the gas-dynamical study on the nozzle and diffuser flows. Results showed, for continuous operation of the free-jet flow, diffuser optimization is critically important. We measured static pressure profiles in the supersonic nozzle as a function of the stagnation pressure and the nozzle geometry, which indicated effects of non-equilibrium condensation on the pressure profiles. We proposed a semi-empirical method to predict the nucleation and cluster formation processes based on the nozzle flow experiments and a numerical model considering the condensation process. The model could characterize the supersaturated states and onset of the condensation from the pressure profiles of the non-equilibrium condensation flow.
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