Vortex induced vibration rotation testing device for bidirectional shear flow lower inclined vertical pipe

Abstract

The invention discloses a vortex induced vibration rotation testing device for a bidirectional shear flow lower inclined vertical pipe, which is inclined in an ocean engineering deepwater pool. The testing device comprises a vertical pipe model mechanism, a measurement and analysis system platform module, a driving module, a top cantilever module, a cylindrical shaft segmentation module, a bottomcantilever module and a bottom supporting module; a vertical pipe model is fixed between the top cantilever module and the bottom cantilever module through a fixed end of special design; the bottom supporting module, the driving module and the top cantilever module are vertically connected through the cylindrical shaft segmentation module vertically arranged in the ocean engineering deepwater pool; the bottom supporting module is fixed on the steel lifting bottom of the pool through high strength bolts; a cylindrical shaft and a cantilever beam are driven by the driving module to rotate; and measurement instruments of the measurement and analysis system platform module are distributed in a pipe module, the top cantilever module and the bottom cantilever module. The testing device is convenient for installation, upgrade and change, and meets different functional requirements.

Description

technical field [0001] The invention relates to a device in the technical field of marine engineering, in particular to a vortex-induced vibration rotation detection device for a flexible riser model obliquely placed in a deep pool of marine engineering under bidirectional shear 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 plat...

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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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