Experimental Study on Coupling Response of Flow-induced Vibration and Pipe-seabed Impact for Hydrogen-mixed Submarine Pipe Span
The reported literature regarding the coupling response of flow-induced vibration and pipe-seabed impact is scanty.Hydrogen-mixed transportation is an essential method to achieve large-scale hydrogen energy transfer after the in-situ hydrogen production from seawater using new energy sources such as ocean wind and solar energy.The introduction of hydrogen into the submarine pipe significantly complicates the flow-induced vibration of the suspended pipe subjected to the combined action of internal and external flows.The pipe-seabed impact is hence affected when the clearance between the pipe and seabed is small.Therefore,a series of experiments are conducted in a circulating water flume to examine the coupling response of a flexible pipe span arranged with small gap ratio.The tests are carried out in the reduced velocity range of 7.82-21.36 and the hydrogen blending ratio range of 0.0-1.0.The experimental results indicate that the second-order response is excited when the pipe is filled with stationary liquid.However,the dominant mode is reduced to the first one when the hydrogen is added into the pipe.As the blending ratio increases,the vibration is enhanced.The increase in hydrogen blending ratio results in the increase of the critical reduced velocity for pipe-seabed impact.When the blending ratio surpasses or equals to 0.5,the critical reduced velocity grows to 12.93.The introduction of hydrogen contributes to the alteration of response mode,and hence the spatial-temporal evolution of impacting position.Particularly,both the impacting length and position vary over time in mode competition cases.
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