Experimental study on weak incipient motion of a smart pebble on the smooth bed
In order to reveal the micro-mechanical mechanism of sediment incipient motion,smart pebble is made by embedding a wireless gyroscope sensor in a ball,and the sediment incipient motion experiment is car-ried out in an open channel flume.Combined with visual measurement technology and real-time collecting of high-frequency data such as particle displacement,velocity,acceleration,angular velocity,etc.,the dynamic mechanism of the impact of different inflow velocities on the weak incipient motion of coarse sediment is studied.The experiment results show that the incipient motion of coarse sediment is a complex dynamic process with translational and rotational motion superimposed,the motion modes show the cross-flow and streamwise oscilla-tion and periodic rotation under the excitation of vortex shedding around the flow.The specific mode is closely related to the particle Reynolds number.In the experimental conditions,the particle cross-flow oscillation phe-nomenon is the most significant when the particle Reynolds number is 386.Based on the experimental data,the characteristics of impulse and kinetic energy in the process of particle incipient motion are further analyzed.
万方数据
维普
