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

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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Problems solved by technology

[0010] (2) Constantly changing the motion parameters of the pulsating interference fluid in front and the dynamic shedding distribution will bring vortex-induced vibration to the rear elastic structure and the dynamic interference mechanism is not yet clear;

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