| Project/Area Number |
12650893
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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 |
Aerospace engineering
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
ARAI Norio Tokyo University of Agriculture and Technology, Depl. of Mech. Sys. Eng., Professor, 工学部, 教授 (20126288)
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| Co-Investigator(Kenkyū-buntansha) |
HIRAKI Koju Inst. of Space & Aero. Sci, Dept. of System, Research Associate, システム研究系, 助手
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Parachute / Supersonic flow / Shock wave / Static and dynamic stability / Wavy distribution |
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| Research Abstract |
It is necessary to decelerate by using various methods when the high speed vehicle entry into the atmosphere of the planet. One of the most effective, aerodynamic deceleration systems is the parachute, and has been used in the point that volume could be small, and that the drag can certainly applied. But, it is a very complex phenomenon for flexibility of it.
In this research, the numerical simulation is applied mainly to analyze the feature of flow field. The 3-dimensional unsteady full Navier-Stokes equations are solved by using the TVD scheme. Also, the body oscillation is analyzed by the equation of the pendulum motion.
The parachute would be pointed out the feature of the importance of the interference with "Overflow" of the fluid from the concave body and the shock wave, while the development of the wavy distributed shock wave is pointed out in early stage, too. Moreover, the important effect of the virtual mass on the flow field, the non-linear interaction of the oscillating body and the wake flow and so on are pointed out.
In the near future, both the inflating process of the parachute and the development of the flow field should be solved simultaneously in perfect, which shows the very strong non-linearity. After catching the phenomena, we could propose the accurate data to design the new parachute.
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