Numerical Simulation And Experimental Study On Flow Field Of Horizontal Media Stirring Mill

As a natural and pollution-free renewable energy,Solar energy has broad potential for development.The bladeless wind turbine does not have the blades of the conventional wind turbine.The capturing device is a cone column.Under the action of the fluid,the cone column structure generates vortex-induced vibration,which drives the generator to generate electricity to realize the conversion of Mechanical energy to electric energy.At present,the research on vortex-induced vibration mainly focuses on how to suppress the generation of vortex-induced vibration.Therefore,from the purpose of using vortex-induced vibration,this paper will carry out simulation research on vortex-induced vibration of cone-shaped column,and discuss the cone-column vortex-induced vibration device.Obtain the dynamic response characteristics of kinetic energy.The main research contents are as follows:（1）The physical model and mathematical model of the vortex-induced vibration of the conical cylinder are established,which is solved by FSI bidirectional coupling.Under the single-degree-of-freedom condition,the influence of the taper ratio on the vortex-induced vibration of a single cone column is discussed.The results show that the amplitude ratio peak increases with the decrease of the taper ratio,and the frequency range of the cone column is increased.Otherwise,with the increase of the taper ratio frequency curve appears"double peak".（2）Under the double-degree-of-freedom condition,the single cone column with different shear rate is simulated.The results show that the same shear rate is independent of the stiffness and the oscillating time gradually increases with the shear rate.Increase;variable stiffness has a greater impact on the lift resistance coefficient.The amplitude ratio of the different flows is only"lower branches",and the lateral amplitude of the shear flow is reduced relative to the uniform flow.As the shear rate increases,the frequency of the tail vortex shedding of the cone column increases and the range of the resonant frequency lock decreases.（3）The simulation model of the double cone column arrangement in single degree of freedom is established.The influence of the pitch ratio and taper on the vortex-induced vibration of the cone column is studied.The results show that the“beat”phenomenon occurs at different pitch ratios,and the downstream amplitude A*reaches a maximum of 1.02D_mean.As the pitch ratio increases,the upstream and downstream resistance becomes smaller,the locking range of the double cone column is gradually shortened,and the amplitude of the downstream cone column is larger than that of the upstream cone column,and decreases with the increase of the taper ratio.At the end of the day,the upstream has a more dramatic impact on the downstream.（4）The simulation model of the double-cone column oblique column arrangement under double degrees of freedom is established,and the influence of the oblique column angle on the vortex-induced vibration of the cone column is discussed.The results show that with the increase of the oblique column angle,the resistance of the original cone column to the inclined cone column increases first and then decreases.The oblique column angle has almost no effect on the sum of the original cone columns,but has a greater influence on the oblique cone columns.When 0°,the amplitude of the oblique cone column is A of 0.92D_mean.As the oblique column angle increases,the diagonal migration gradually decreases by 5.4%,10.8%,and 15.2%.The original cone-column trajectory is dominated by the"8"shape under different oblique angles,while the oblique cone column presents"crescent"shape,"water drop"shape,"ellipse"shape,"1"shape and the like.As the oblique angle increases,the wake vortex appears to be“impact”and“in-phase step”vortex.In this paper,the vortex-induced vibration phenomenon of cone-shaped vibrators is studied,and the conclusions obtained have important practical significance and guiding value for the development of bladeless turbines.