Rotary testing device for vortex-induced vibration for oblique riser under shear current

Abstract

The invention relates to a rotary testing device for vortex-induced vibration for an oblique riser under shear current, belonging to the technical field of ocean engineering. The rotary testing device comprises a riser model mechanism, a measurement and analysis system platform module, a driving module, a top cantilever module, a cylinder shaft segmentation module, a bottom riser fixing module and a bottom supporting module, wherein the riser model mechanism is fixedly arranged between the top cantilever module and the bottom riser fixing module; the cylinder shaft segmentation module is vertically arranged in an ocean engineering deepwater basin and respectively connected with the bottom supporting module, the driving module, the top cantilever module and the bottom riser fixing module; the bottom supporting module is fixedly arranged on a lifting bottom; the driving module is connected with the cylinder shaft segmentation module and outputs power; both ends of the top cantilever module are connected with the driving module or the cylinder shaft segmentation module and the cylinder shaft segmentation module; and the measurement and analysis system platform module is connected with the riser model mechanism, the top cantilever module and the bottom riser fixing module. The invention can simulate risers of actual sizes and shear current fields.

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 placed obliquely in a deep pool of marine engineering under shear flow. Background technique [0002] According to fluid mechanics, when a columnar structure is placed in the incoming flow at a certain speed, vortices will alternately shed on both sides. 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 platform risers, tow cables, submarine pi...

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

Images