Marine riser vortex-induced vibration suppression device

Abstract

The invention discloses a marine riser vortex-induced vibration suppression device. The marine riser vortex-induced vibration suppression device comprises an upper connecting table, a lower connectingtable and a flow guiding barrel, wherein U-shaped grooves are separately formed in the upper connecting table and the lower connecting table; connecting columns which are matched with the U-shaped grooves are arranged at the upper end and the lower end of the flow guiding barrel 1; the flow guiding barrel is connected with the upper connecting table and the lower connecting table by inserting theconnecting columns into the U-shaped grooves; flow guiding fins are arranged on the outer peripheral surface of the body of the flow guiding barrel; and the flow guiding fins are spirally distributedalong the axis of the flow guiding barrel. The vortex-induced vibration suppression device comprises the flow guiding barrel and a fixing barrel, the flow guiding barrel is connected with the fixingbarrel by inserting the connecting columns into the U-shaped grooves, therefore, when the speed of water flow of a seabed is over high, the flow guiding barrel can rotate around the fixing barrel, a flow field is damaged actively, and therefore, the effect of suppressing vortex-induced vibration is good.

Description

technical field [0001] The invention belongs to the technical field of marine engineering, in particular to the technical field of laying marine riser facilities. Background technique [0002] The marine flexible riser is the connecting pipeline from the subsea oil and gas wellhead to the oil and gas gathering station (ship), and plays a key role in the development of offshore oil and gas resources. An important factor causing the vibration response of the marine riser is the vortex-induced vibration caused by the water flow, which is the main cause of the fatigue failure of the riser. If the shedding frequency of the vortex is the same as the vibration frequency of the pipe, "locking" occurs. Although the "locking" phenomenon will not cause immediate damage to the submarine riser, it will aggravate the fatigue damage of the pipeline, thereby affecting the safety of the pipeline. [0003] At present, there are two main ideas for the suppression of vortex-induced vibration ...

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Problems solved by technology

[0004] However, most of the current passive vortex-induced suppression devices cannot deal with incoming flow in any direction, and their scope of application is limited; while active suppression devices require additional power consumption, complicated installation, and numerous processes, and have not yet met the promotion requirements.

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