Device for testing vortex-excited oscillation and rotation of vertical riser pipe under uniform flow and stepped uniform flow

Abstract

The invention relates to a device for testing vortex-excited oscillation and rotation of a vertical riser pipe under a uniform flow and a stepped uniform flow, belonging to the technical field of ocean engineering. The device comprises a riser pipe model mechanism, a measurement and analysis system platform module, a driving module, a top cantilever module, a bottom cantilever module, a cylindrical shaft segmentation module and a bottom support module, wherein the riser pipe model mechanism is fixedly arranged between the bottom cantilever module and the top cantilever module; the cylindricalshaft segmentation module is perpendicularly arranged in a deep ocean engineering pool and is respectively and perpendicularly connected with the bottom support module, the driving module and the topcantilever module; the bottom support module is fixedly arranged on a lifting bottom; the driving module is respectively connected with the cylindrical shaft segmentation module and the top cantilever module; the left end and the right end of the top cantilever module are respectively connected with the cylindrical shaft segmentation module; and the measurement and analysis system platform moduleis respectively connected with a riser pipe model, the top cantilever module and the bottom cantilever module. By using the invention, the uniform or stepped flow field of a riser pipe with an actualsize can be simulated.

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 for a flexible riser model vertically placed in a deep pool of marine engineering 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, vortex-induced vibrations will occur on flexible pipes such as offshore platfor...

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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

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