Dynamic Characteristics of Deep-Sea Intake Pipe under Internal and External Flow
The deep-sea intake pipe is a type of overhanging suction pipe with a high slenderness ratio and high internal flow velocity.Simulating the real operating conditions of the intake pipe and studying the pipe's dynamic performance under the influence of internal and external flows is extremely necessary.Based on small-scale model tests,the influence of internal and external flows on the dynamic characteristics of pipes is investigated.The results show that under most working conditions,the amplitude and frequency of pipe vibration caused by the combined action of internal and external flow are mainly affected by the outflow.Under the combined action of internal and external flow,the increase of internal flow velocity will lead to a slight decrease in the main frequency of displacement vibration,an increase in the top tension,and a decrease in the strain response of the pipe.But it has little influence on the strain dominant order of vibration.The top connection mode,bottom counterweight,and immersion depth of the pipe will affect the vortex-induced vibration characteristics of the pipe under the action of internal and external flow.That is,the top hinge is more likely to stimulate the high-order modal vibration of the vortex-induced transverse flow direction of the pipe than the fixed connection.And the bottom counterweight will reduce the vibration amplitude of the pipe under the small outflow velocity,and increase the vibration amplitude of the pipe under the large outflow velocity,and stimulate the transition of the cross-flow to the higher-order dominant frequency.Meantime the increase of the submerged water depth will reduce the dominant frequency of the pipe vibration.The research results can provide a reference for the design of deep-sea intake pipes in practical engineering projects.
deep-seaoverhanging intake pipeinternal and external flowdynamic characteristicsvortex-induced vibration
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