Elastic cylinder vortex-induced vibration rule and coupling mechanism determination method

A technology of vortex-induced vibration and measurement method, which is applied in the field of fluid and structure, and can solve the problems of unclear vortex-induced vibration law and dynamic interference mechanism of rear elastic structures.

Inactive Publication Date: 2019-05-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0010] (2) Constantly changing the motion parameters of the pulsating interference fluid in front and the dynamic shedding dis...

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  • Elastic cylinder vortex-induced vibration rule and coupling mechanism determination method
  • Elastic cylinder vortex-induced vibration rule and coupling mechanism determination method
  • Elastic cylinder vortex-induced vibration rule and coupling mechanism determination method

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Embodiment Construction

[0047] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0048] The present invention analyzes the pressure and dynamic vortex distribution around the fluttering airfoil and the vibrating cylinder along the chord direction and span direction, and solves problems such as the dynamic flow characteristics of the vibrating cylinder flow field and the control force interference between the fluttering airfoils. Analyze in depth. The dynamic fluid characteristics, the shedding frequency and the distribution of the shedding structure of the dynamic flapping airfoil under different parameters such as flapping angle, flapping frequency and Reynolds number are clarified. The change law and...

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Abstract

The invention belongs to the technical field of fluid and structure, and discloses an elastic cylinder vortex-induced vibration rule and coupling mechanism determination method. According to the method, rules of influence to dynamic flow field, vortex shedding frequency, dynamic vortex distribution, stability and vortex-induced vibration of elastic are determined as well as unsteady aerodynamic force interference characteristic and coupling mechanism between flapping wings and the elastic-vibration cylinders by analyzing unsteady aerodynamic force characteristics, flow field variation, vortexshedding frequency and vortex shedding structure distribution rule of the flapping wings. The dynamic fluid characteristics, vortex shedding frequency and vortex shedding structure distribution rule of the flapping wings under variation of parameters such as different flapping angle, flapping frequency and Reynolds number is defined; the vortex-induced vibration vibration rule and coupling mechanism of the elastic cylinders under different flapping angle, flapping frequency, mass ratio, damping ratio, spring stiffness coefficient, flow parameters under different degrees of freedom, and dynamicvortex distribution parameter along with motion of the flapping wings is determined.

Description

technical field [0001] The invention belongs to the technical field of fluid and structure, and in particular relates to a method for measuring the law of vortex-induced vibration and coupling mechanism of an elastic cylinder. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] The flow around a bluff body, especially a cylinder, is the most common problem of fluid-structure coupling. Such as bridges, chimneys, high-rise buildings, aircraft rudder surfaces, engines and other aerodynamic and hydrodynamic structures. Especially in many engineering fields in recent years, such as vortex induced vibration of nuclear reactor fuel rods, heat exchanger tube bundles, marine risers and other structures. Long-term vortex-induced vibration will cause structural fatigue damage, noise, and the resulting resonance will cause serious damage to the structure. For example, in the famous 1940 Tacoma Channel suspension b...

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Application Information

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IPC IPC(8): G01M7/02G01M9/00G01M10/00
Inventor 张国庆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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