Air-injection active-driving device for vertical pipe vortex-induced vibration

Abstract

The invention belongs to the technical field of ocean engineering technology and relates to an air-injection active-driving device for a vertical pipe vortex-induced vibration. The air-injection active-driving device comprises a trepanning steel pipe, metal hoops, a high-pressure air pump, a pressure increasing valve, pressure sensors and control computers, wherein the trepanning steel pipe is connected with a vertical pipe via metal hoops and parallel to the vertical pipe; the trepanning steel pipe is installed on one side of a flow direction of the vertical pipe; opening holes of the steel pipe are formed along an axis of the vertical pipe and the opening holes all face the same direction of the flow direction; the top of the steel pipe is connected with the high-pressure air pump via the pressure increasing valve; two sets of pressure sensors are arranged on the surface of the steel pipe; the pressure sensors are respectively connected with the control computers via a control end of the high-pressure control end. When ocean currents or waves pass through the vertical pipe, the pressure sensors transmit a signal to the control computer; when the pressure signal excesses a preset value, the control computer automatically starts the high-pressure air pump, outputs high pressure air flows and injects the same via the opening holes of the steel pipe; the ocean currents or the waves can be effectively disturbed by the air flow, so vertical pipe vortex-induced vibration can be reduced.

Description

technical field [0001] The invention belongs to the field of vibration suppression of marine risers, and in particular relates to a jet-type active drive device for vortex-induced vibration of risers. Background technique [0002] The offshore riser is an important part of the deep-sea oil and gas field development system, and it is the connecting pipeline between the offshore platform and the subsea wellhead. The vortex-induced vibration generated under external environmental loads such as waves and ocean currents is the main cause of fatigue failure of risers. Once the riser is damaged, it will cause huge economic losses and lead to serious marine pollution and secondary disasters. Therefore, in the design of risers, how to reduce the amplitude of vortex-induced vibration and prolong the fatigue life of marine risers is a hot spot in the engineering circles of various countries. At present, the main method in the world is to add a vibration suppression device outside the...

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Problems solved by technology

Once the riser is damaged, it will cause huge economic losses and cause serious marine pollution and secondary disasters.

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