Vortex-induced vibration test device for multi-span submarine pipeline under the condition of uniform inclination angle and incoming flow

Abstract

The invention discloses a multi-span subsea pipeline vortex-induced vibration test device with a uniform inclination angle and incoming flow conditions, including a subsea pipeline model, a transverse test support frame, a trailer, a strain acquisition instrument and a computer. One end of the subsea pipeline model is provided with a first end. Support device, the other end of the submarine pipeline model is provided with a second end support device, the middle part of the submarine pipeline model is provided with a multi-span support device, and the tops of the first end support device and the second end support device are respectively connected to the transverse test support The two ends of the frame are connected, the top of the multi-span support device is connected with the middle part of the horizontal test support frame; the horizontal test support frame is fixed at the bottom of the trailer; the submarine pipeline model includes several wires and a thin-walled copper pipe, the wires and the tension sensor are connected with the The strain acquisition instrument is connected, and the strain acquisition instrument is connected with the computer. The invention minimizes the interference of the multi-span supporting device on the flow field. The two ends of the support are fixed by steel wire ropes and tension tensioners, which enhances the stability of the multi-span support.

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 multi-span submarine pipelines with uniform inclination and incoming flow. Background technique [0002] With the increasing scarcity of land oil resources, the development of offshore oil and gas resources has developed rapidly, and the number of submarine pipelines has increased year by year. 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"...

AI Technical Summary

Problems solved by technology

However, in actual engineering practice, the axial direction of the submarine pipeline does not completely coincide with the vertical direction of the incoming flow, and there is a certain inclination angle

The existence of the inclination makes the vortex-induced vibration of multi-span submarine pipelines very complicated, and there is still a lack of related research work

The main reason is the lack of necessary test equipment to approximate the conditions of uniform inclination angle flow and multi-span support conditions in actual ocean engineering

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