Inclination angle uniform inflow condition multi-span seabed pipeline vortex induced vibration test device

Abstract

The invention discloses an inclination angle uniform inflow condition multi-span seabed pipeline vortex induced vibration test device. The inclination angle uniform inflow condition multi-span seabed pipeline vortex induced vibration test device comprises a seabed pipeline model, a transverse test support, a trailer, a strain acquisition instrument and a computer, wherein one end of the seabed pipeline model is provided with a first end portion supporting device, the other end of the seabed pipeline model is provided with a second end portion supporting device, the middle portion of the seabed pipeline model is provided with a multi-span supporting device, top portions of the first end portion supporting device and the second end portion supporting device are respectively connected with two ends of the transverse test support, the top portion of the multi-span supporting device is connected with the middle portion of the transverse test support, the transverse test support is fixed at the bottom portion of the trailer, the seabed pipeline model comprises multiple leads and a fine copper pipe, the leads and a pulling force sensor are connected with the strain acquisition instrument, and the strain acquisition instrument is connected with the computer. The inclination angle uniform inflow condition multi-span seabed pipeline vortex induced vibration test device reduces interference of the multi-span supporting device on a flow field at the maximum degree, two ends are supported through steel ropes and a pulling force tightener, and multi-span supporting stability is improved.

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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