Deep sea vertical pipe array model vortex-induced vibration test device with top capable of moving in step flow

Abstract

The invention discloses a step-flow deep sea vertical pipe array model vortex-induced vibration test device capable of considering top movement influences, belonging to the technical field of ocean engineering. The device comprise a plurality of deep sea vertical pipe modules, a top support module, a bottom support module, two vertical track modules, a horizontal track module, four fairing modules, a sleeve module, four motor modules and a measurement analysis control module. The test device disclosed by the invention can be provided with a large-size vertical pipe module, so as to avoid the size effect; by utilizing the test device disclosed by the invention, the vertical track modules and the horizontal module are fully used for simulating vortex-induced vibration of a large-size vertical model under the influence of an ocean platform; and the test device can be used for simulating different arrays formed by the deep sea vertical pipe modules according to the actual requirements. The sleeve is arranged outside the vertical pipe model, vertical pipes in the sleeve are not influenced by water flow during the test, and simulation of a step flow can be realized, thus the simulated external environment of the vertical pipe model is truer; and the modular design is adopted in the test device, thus the test device is convenient to mount and dismount.

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 of a ladder flow 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 comple...

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

7. Generally, it can only simulate the vortex-induced vibration of uniform flow, and it is difficult to carry out the vortex-induced vibration test under the step flow

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