Vortex-induced vibration simulation test device for deep sea riser model with movable top end under uniform flow

Abstract

The invention provides a vortex-induced vibration rotary test device for an oblique riser with movable top under shear flow. The test device comprises a deep sea riser module, a top support module, a bottom support module, two vertical track modules, a horizontal track module, four motor modules, four fairing modules and a measurement analysis control module, wherein the two vertical track modules are connected with the bottom of the horizontal track module, the top support module and the bottom support module respectively; the horizontal track module is connected with the tops of the two vertical track modules; the two ends of the deep sea riser module are connected with the top support module and the bottom support module respectively; and the measurement analysis control module is connected with the deep sea riser module, the top support module and the bottom support module. According to the test device, vortex-induced vibration of a large-sized riser model under the influence of asea platform can be simulated by fully utilizing the vertical track modules and the horizontal track module; and the test device is very convenient to install and detach.

Description

technical field [0001] The invention relates to a device in the technical field of ocean engineering, in particular to a vortex-induced vibration simulation test device for a deep-sea riser model with a movable top evenly flowing 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. As offshore oil and gas exploitation advances to deep water, the riser in deep water can be regarded as a slender and flexible structure, and the theory of small deformation i...

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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 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 motion of the platform at the top of the riser cannot be simulated, so as to study the influence of the motion of the platform on the vortex-induced vibration of the riser

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