1994 Fiscal Year Final Research Report Summary
High velocirt flows of dense gases
| Project/Area Number |
05805081
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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 |
ISHII Ryuji Kyoto Univ.Faculty of Eng.Assoc.Prof., 工学部, 助教授 (20026339)
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| Co-Investigator(Kenkyū-buntansha) |
UMEDA Yoshikuni Kyoto Univ.Faculty of Eng.Instr., 工学部, 助手 (30026132)
MORIOKA Shigeki Kyoto Univ.Faculty of Eng.Prof., 工学部, 教授 (60029395)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Dense Gas / Supersonic Flow / Expansion Shock / Condensation / Evaporation |
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| Research Abstract |
1.The shock transition in the van der Waals gas has been studied analytically and numerically. It was proved that two shock adiabatics in the pV-plane can intersect at four points. This never occurs in the perfect gas. In special cases, a single shock was equivalently effected by two successive shock transitions. The supersonic-supersonic shock waves were stably simulated at least numerically.
2.A shock tube for n-pentan was constructed and the basic experiments were performed to check the validity and the security of the equipment.
3.A relected shock tunnel was designsd and constructed. Freejets of n-pentan were realized in the shock tunnel and the liquifaction shock and the shock splitting were observed by optical method (Shlieren photographs) .
4.From the theoretical analysis, it was proved that the gas stste with a negative fundamental derivative GAMMA is very difficult to be realized by the shock compression for n-pentan. This is because n-pentan has very large specific heat and then cannot effectively be heated by the shock compression. This suggests that the shock tube for very high temperature gas (300-400 K) is necessary to realize the gas state with negative GAMMA. Modification and improvement of the present equipment are needed for the future experimental study.
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