Vortex-induced vibration test device for movable deep sea vertical pipe array model at lower top end of uniform flow

Abstract

The invention provides a vortex-induced vibration test device for a movable deep sea vertical pipe array model at the lower top end of uniform flow. The vortex-induced vibration test device comprises a plurality of deep sea vertical pipe modules, a top support module, a bottom support module, two vertical rail modules, a horizontal rail module, four motor modules, four cowling modules and a measuring and analytical control module, wherein two ends of each deep sea vertical pipe module are connected with the top support module and the bottom support module; and the measuring and analytical control module is connected with the deep sea vertical pipe modules by a lead. In the vortex-induced vibration test device, a large-scale vertical pipe model can be arranged to avoid a scale effect; the vertical rail modules and the horizontal rail module can be utilized fully to simulate vortex-induced vibration of the large-scale vertical pipe model under the influence of an ocean platform; and different arrays formed by the deep sea vertical pipe modules can be simulated according to actual requirements. Due to the adoption of modular design, the vortex-induced vibration test device is convenient to assemble and disassemble.

Description

technical field [0001] The invention relates to a device in the technical field of marine engineering, in particular to a vortex-induced vibration test device for a deep-sea riser array model with a movable top evenly flowing down. 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. Deep-sea risers often appear in the form of arrays. Since each riser is close to each other, there will be hydrodynamic interference between each other, resulting in more complex ...

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 the scale effect is difficult to avoid; 2. Due to the speed limit of the ocean engineering pool trailer, it is difficult to effectively carry out the real Reynolds number. Vortex induced vibration test

3. 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

4. Forced oscillation test cannot be carried out

5. The movement of the platform cannot be simulated, so as to study the influence of the movement of the platform on the vortex induced vibration of the standpipe

6. Only the vortex-induced vibration test of a single standpipe model can be carried out, and it is difficult to carry out the vortex-induced vibration test of two or more standpipe arrays

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