Study on Vortex Flow around Elastic Airfoil and Thin Film Determined by Reynolds number, Strouhal number and Bending Stiffness
| Project/Area Number |
25420126
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
Fuchiwaki Masaki 九州工業大学, 大学院情報工学研究院, 准教授 (60346864)
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| Co-Investigator(Kenkyū-buntansha) |
Kazuhiro Tanaka 九州工業大学, 大学院情報工学研究院, 教授 (80171742)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 非定常流れ / はく離 / 翼 / 非定常運動 / 渦 |
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| Outline of Final Research Achievements |
The bending stiffness of an elastic airfoil with a non-uniform cross-section is uniquely determined by the thickness at the position of the center of gravity and the span length, independent of the shape or thickness of the airfoil. It is an important parameter that determines the bending characteristics and the moving boundary conditions at the wall surfaces in the fluid. The characteristic of dynamic forces acting on a heaving elastic airfoil depends on the ratio St2/K. In the regime below the critical Reynolds number, the impact of this parameter is extremely small. For a thin film, the LEVs produced from the leading edge and the TVs produced by the trailing edge interfere strongly and form a vortex ring. An accelerating flow arises even far into the wake of the thin film, because the vortex rings evolve towards the wake at an incline with respect to the main flow, and a substantial propulsive force is induced over almost the entire pitching cycle for an elastic thin film.
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Report
(4 results)
Research Products
(15 results)
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[Presentation] Three-dimensional Vortex Structure around a Free Flight Butterfly2014
Author(s)
Masaki Fuchiwaki, Taichi Kuroki, Kazuhiro Tanaka and Takahide Tabata
Organizer
ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting and 11th International Conference on Nanochannels, Microchannels, and Minichannels
Place of Presentation
Chicago, Illinois
Year and Date
2014-08-03 – 2014-08-07
Related Report
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