Fluid Force and Flutter Margin of a Pitching Hydrofoil in Subcavitation Region
| العنوان: | Fluid Force and Flutter Margin of a Pitching Hydrofoil in Subcavitation Region |
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| المؤلفون: | Naoto Okazaki, Yasuaki Matsudaira |
| المصدر: | TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B. 63:2938-2944 |
| بيانات النشر: | Japan Society of Mechanical Engineers, 1997. |
| سنة النشر: | 1997 |
| مصطلحات موضوعية: | Reduced frequency, Lift (force), Physics, Inertia force, Fluid force, Angle of attack, Mechanical Engineering, Cavitation, Flutter, Mechanics, Condensed Matter Physics, Load cell |
| الوصف: | The torsional flutter margins of a pitching hydrofoil in the subcavitation region under various flow and vibrational parameters, i.e, the angle of attack, the cavitation number, the reduced frequency and the torsional axis, were expermentally investigated. The cavitation aspects of the hydrofoil are shown using high-speed photographs. The unsteady lift and moment were measured using a torsional vibration-apparatus with load cells which can eliminate the mechanical inertia force and moment of the pitching hydrofoil. The type and intensity of the separation on the hydrofoil have a large influence on the cavitation aspect, the unsteady fluid force and the flutter margin in the subcavitation region. In the case of nonseparation. an unstable range of the flutter exists neither in the noncavitation region nor in the subcavitation region. In the case of separation in the noncavitation region, the flutter margin expands to the higher reduced frequency side as the angle of attack increases, and in the subcavitation region, these flutter margins remain until the cavity length reaches the mid-chord. However, the flutter margin slides toward the higher reduced frequency side maintaining the same width as the cavity length extends from the mid-chord to the full chord. |
| تدمد: | 1884-8346 0387-5016 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::978caea1d0f7e6751ee4341302d97490 https://doi.org/10.1299/kikaib.63.2938 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........978caea1d0f7e6751ee4341302d97490 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 18848346 03875016 |
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