Vortex-induced vibration test device for vertical multi-span submarine pipeline with local velocity increase

Abstract

The invention discloses a vortex-induced vibration test device for a multi-span submarine pipeline with increased local flow velocity, which includes a submarine pipeline model, a transverse test support frame, a trailer, a strain acquisition instrument and a computer. The middle part of the submarine pipeline model is provided with a multi-span Supporting device, the submarine pipeline model is also equipped with a flow rate increasing device, the flow rate increasing device includes a flow rate increasing cover and a supporting device, the flow rate increasing cover is set on the submarine pipeline model, and the flow rate increasing cover is arranged in sequence according to the direction of water flow The speed increasing section and the steady flow section, the speed increasing section is trumpet-shaped, the opening of the steady flow section is consistent with the small mouth end of the trumpet shape, and the steady flow section is provided with a through hole for the submarine pipeline model to pass through. The invention does not cause too much disturbance to the flow field, and is more in line with engineering practice. Simultaneously, the design of the present invention is exquisite and simple, convenient for processing, installation and dismantling, and low in cost. It is an indispensable test equipment for studying the vortex-induced vibration of a multi-span submarine pipeline with increased local velocity and vertical incoming flow, and has important application value.

Description

technical field [0001] The invention relates to a test device in the technical field of marine engineering, in particular to a test device for vortex-induced vibration of a multi-span submarine pipeline with vertically increasing local flow velocity. Background technique [0002] Submarine pipelines are the lifeline of offshore oil and gas fields, closely linking the entire production. Due to the complex topography of the seabed and the harsh environment, the submarine pipeline inevitably forms suspended spans, or even multi-spans. When seawater flows through the spanning pipeline, alternate vortex shedding will occur at the trailing edge of the pipeline. When the vortex shedding frequency is close to the natural vibration frequency of the pipeline, the vibration of the pipeline will force the vortex shedding frequency to be fixed near the natural vibration frequency of the pipeline, thus "locking" occurs. "Phenomenon. The vortex-induced vibration and "locking" phenomenon ...

AI Technical Summary

Problems solved by technology

[0005] At the same time, the flow velocity section along the axial direction of the pipeline in the suspended section is not constant, and there is a situation where the local flow velocity increases

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