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

Abstract

The invention relates to a vortex-induced vibration simulation test device for a pre-tensioned deep-sea riser model under step 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, a sleeve module and a measurement, analysis and control module. By using a trailer and a towing basin which move relatively to simulate incoming flows with different flow rates, in combination with the effect of local flow resistance of the sleeve module, the simulation of the step flows is realized, pre-tension can be applied to the two ends of the deep-sea riser model and the simulation of the 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 subjected to pretension under a ladder flow. 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, vortex-induced vibrations will occur on flexible pipes such as offshore platform risers, tow cables, submarine pipelines...

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 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. Generally, it can only simulate the vortex-induced vibration of uniform flow, and it is difficult to carry out the vortex-induced vibration test under the step flow

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