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

Abstract

The invention discloses a vortex-induced vibration simulation test device for a deep sea riser model with a movable top end under the action of step flow, relates to the technical field of the oceanographic engineering and solves the technical problem of simulating the vortex-induced vibration of a deep sea riser under the action of the step flow. The device comprises a towing tank, a trailer, a deep sea riser module, a top supporting module, a bottom supporting module, vertical rail modules, a horizontal rail module, a sleeve module and a measurement analysis control module. The horizontal rail module is hung on the trailer. Two vertical rail modules are provided and are respectively and vertically hung on the horizontal rail module. The top supporting module and the bottom supporting module are respectively arranged on the two vertical rail modules and are both provided with acceleration transducers. A sleeve part in the sleeve module is sleeved on the periphery of the riser model of the deep sea riser module. The measurement analysis control module is connected with each fiber grating sensor, each acceleration transducer and each motor. The device provided by the invention can be used for simulating the vertex-induced vibration of the deep sea riser under the action of the step flow.

Description

technical field [0001] The invention relates to marine engineering technology, in particular to a technology of a vortex-induced vibration simulation test device for a deep-sea riser model with a movable top of a ladder flow 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. For example, under the action of ocean currents or the movement of ocean platforms, vortex-induced vibrations will appear on flexible pipes such as risers, tow cables, submarine pi...

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Problems solved by technology

The shortcomings of this test technology are: 1) It can only simulate the vortex-induced vibration of small-scale pipe fittings, and the scale effect is unavoidable; 2) Due to the speed limit of the ocean engineering tank trailer, it is difficult to effectively conduct the vortex-induced vibration test at the real Reynolds number ; 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 small, and the measured test data is less; 4) It can only simulate the vortex-induced vibration of the uniform flow, and it is difficult to carry out the vortex-induced vibration of the step flow 5) The forced oscillation test cannot be carried out; 6) The movement of the offshore platform cannot be simulated to study the influence of the platform movement on the vortex-induced vibration of the riser

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