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Effects of Span Length and Additional Structure on Flow-Induced Transverse Vibration Characteristic of a Cantilevered Rectangular Prism

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Journal of Flow Control, Measurement & Visualization 2020年第3期8卷 102-120页

作者： La Ode Ahmad Barata Takahiro Kiwata Takaaki Kono Toshiyuki Ueno Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan School of Mechanical Engineering Kanazawa University Kanazawa Japan School of Electrical and Computer Engineering Kanazawa University Kanazawa Japan

We consider the effects of the aspect ratio L/H (where L is the length of a prism, and H is the height of a prism normal to the flow direction) and the size of additional structures (which are a plate and a fin on the surface of a prism) on a vibration characteristic of a cantilevered rectangular prism. The present research is intended to support the analysis of energy harvesting research on the flow-induced vibration in water flow using a magnetostrictive phenomenon. The prisms are constructed from stainless steel and mounted elastically to a plate spring attached to the ceiling wall of the water tunnel. The prisms with aspect ratios of L/H ≥ 5 have reasonably identical vibration characteristics. However, the difference in the vibration characteristic appears distinctly on a rectangular prism with an aspect ratio of L/H = 2.5. The rectangular prism with an aspect ratio of L/H = 10 and a side ratio of D/H = 0.2 has a stable and large response amplitude and oscillates with a lower velocity. The length of the added plate and the size of the added fin influence the velocity of vibration onset. If the length of the added plate and fin size on the rectangular prism with D/H = 0.2 becomes large, the curve of the response amplitude shifts to that of the rectangular prism with D/H= 0.5. The response amplitude of the rectangular prism with/without plate or fin is found to be related to the second moment of area of the prism.

关键词： Flow-Induced Vibration Cantilevered Rectangular Prism Aspect Ratio Stepped Prism Finned Prism Response Amplitude resonant reduced velocity

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