| Project/Area Number |
60550040
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Aerospace engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
TESHIMA Koji Department of Aeronautical Engineering, Faculty of Eng, Kyoto Univ. Instructor, 工学部, 助手 (90026104)
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| Co-Investigator(Kenkyū-buntansha) |
森 敏一 大阪工業大学, 短期大学部, 教授
MORI Toshikazu College of Engineering, Osaka Institute of Technology, Professor
TSUKAMOTO Akimasa Department of Aeronautical Engineering, Faculty of Eng. Kyoto Univ. Technical Of
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1986: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1985: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Condensation / Gasdynamics / Supersonic Freejet / Numerical Fluid Dynamics / Thermodynamics / レーリー散乱 |
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| Research Abstract |
1. Experimental studies of argon freejets with condensation.
1) Freejet flow-fields were visualized utilizing laser Rayleigh scattering from condensates. From analysis of the visualized jets influences of condensation on the jet structure were examined; the Mach disk moves downstream and the barrel shock expands as a result of condensation. Stronger scattering was observed in a region between the barrel shock and the jet boundary than in the jet core.
2) Strength of the Rayleigh scattering was measured along the jet axis. Changes of an average number of atoms in a cluster, J, were obtained from the measured intensity using numerical results of the condensation mass ratio. The value of J reaches 100 - 6000 depending on the stagnation condition. These values agree with those measured by a more direct method in a cluster beam.
2. Numerical simulation of a freejet with non-equilibrium condensation.
1) A method of numerical simulation of a freejet with condensation was established. For the condensation the classical nucleation theory was used.
2) The method was extended to a case of a stochastic nucleation process. Numerical results show that the macroscopic flow properties are almost independent of unkown properties concerning with small clusters, but microscopic ones like values of J depends strongly on these values. By comparing parametric studies using this numerical method with experimental observation these parameters can be determined and hence the non-equilibrium condensation processe in a supersonic jet will become more clear.
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