Vortex induced vibration rotation testing device of inclined vertical pipe with movable top part under step shear flow

Abstract

The invention provides a vortex induced vibration rotation testing device of an inclined vertical pipe with a movable top end under a step shear flow, belongs to the technical field of marine engineering. The vortex induced vibration rotation testing device comprises a vertical pipe model mechanism, a measurement analysis system platform module, a driving module, a top cantilever module, a cylinder shaft section module, a bottom vertical pipe fixing module, a bottom supporting module and an oscillation module; the vertical pipe model mechanism is fixed between the oscillation module and the bottom vertical pipe fixing module, the oscillation module is fixed on the top cantilever module, the driving module is respectively connected with the cylinder shaft section module and the top cantilever module, the left and right ends of the top cantilever module are respectively connected with the cylinder shaft section module, the measurement analysis system platform module is respectively connected with the vertical pipe model, the top cantilever module, the oscillation module and the bottom vertical pipe fixing module. The testing device provided by the invention can simulate the verticalpipe step shear flow field and vertical pipe top platform movement in an actual size.

Description

technical field [0001] The invention relates to a device in the technical field of marine engineering, in particular to a vortex-induced oscillation rotating test device in which a flexible riser model is obliquely placed in a deep pool of marine engineering and its top can move under stepped 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 or ocean platform movements, vortex-induced vibrations will occur on flexib...

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

4. Forced oscillation test cannot be performed

5. The motion of the ocean platform cannot be simulated to study the influence of the motion of the ocean platform on the vortex-induced vibration of the riser

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