Vortex-induced vibration simulation test device for pre-tensioned deep-sea riser model under even flow

Abstract

The invention relates to a vortex-induced vibration simulation test device for a pre-tensioned deep-sea riser model under even flows in the technical field of oceanographic engineering. The vortex-induced vibration simulation test device comprises a deep-sea riser module, a first end part supporting module, a second end part supporting module, a first fixed column module, a second fixed column module, a force application module, two cowling modules, two wave suppression plate modules and a measurement, analysis and control module. By using a trailer and a towing basin which move relatively tosimulate even incoming flows with different flow rates, pretension can be applied to the two ends of the deep-sea riser model and therefore the simulation of deep-sea riser vortex-induced vibration under a laboratory environment is realized. The vortex-induced vibration simulation test device has the advantages that the testing time is long and the deep-sea riser model which is transversely arranged in the towing basin at high flow rate can be tested.

Description

technical field [0001] The invention relates to a device in the technical field of marine engineering, in particular to a vortex-induced vibration simulation test device for a deep-sea riser model under uniform flow and pretension. 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 is no...

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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 tank 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 small, and the measured test data is less

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