Uniform flow and step flow down the top movable vertical standpipe vortex-induced vibration rotating device

Abstract

The invention provides a top-movable vortex-induced vibration rotating device for a vertically-arranged vertical pipe under uniform flow and step flow in the technical field of ocean engineering. The device comprises a vertical pipe model mechanism, a measurement and analysis system platform module, a driving module, a top cantilever module, a bottom cantilever module, a cylinder shaft segmentation module, a bottom support module and a vibration module, wherein the vertical pipe model mechanism is fixedly arranged between the vibration module and the bottom cantilever module; the vibration module is fixed on the top cantilever module; the cylinder shaft segmentation module is vertically arranged in an ocean engineering deep pool and is vertically connected with the bottom support module, the driving module and the top cantilever module respectively; the bottom support module is fixedly arranged on a lifting base; the driving module is connected with the cylinder shaft segmentation module and the top cantilever module respectively; and the left and right ends of the top cantilever module are connected with the cylinder shaft segmentation module. The device can simulate the verticalpipe of an actual size, a uniform or step flow field, and the motion of a platform on the top of the vertical pipe.

Description

technical field [0001] The invention relates to a device in the technical field of marine engineering, in particular to a vortex-induced vibration rotating test device vertically placed in a deep pool of marine engineering, and the top of a flexible riser model can move under uniform flow or step flow. Background technique [0002] According to the knowledge of fluid mechanics, when a columnar structure is placed in a certain speed of incoming flow, alternate vortices will occur on both sides of it. Associated with the creation and discharge of vortices, the column is subjected to lateral and flow-wise pulsating pressures. If the column is elastically supported at this point, the pulsating fluid forces will induce vibrations in the column, which in turn will change the structure of its wake. This fluid-structure interaction problem is called vortex-induced vibration. For example, under the action of ocean currents or ocean platform movements, vortex-induced vibrations will...

AI Technical Summary

Problems solved by technology

After analysis, the shortcomings of this test technology are: 1. Generally, it can only simulate the vortex-induced vibration of small-scale pipe fittings, and it is difficult to effectively carry out the vortex-induced vibration test under the real Reynolds number

2. Due to the limitation of the length of the deep water tank of the towed marine engineering, the distance of the test section obtained is relatively small, and the measured test data is less

3. Generally, only the vortex-induced vibration of the standpipe in the uniform flow field can be simulated, and the vortex-induced vibration of the standpipe in the stepped flow field cannot be simulated

4. Forced oscillation test cannot be performed

5. The motion of the ocean platform cannot be simulated to study the influence of the motion of the ocean platform on the vortex-induced vibration of the riser

Images