Fluid-solid Interaction Simulation On The Flow Field Characteristics Of Y-shaped Flexible-blade Impeller

Stirring equipment is one of the commonly used equipment in petrochemical industry,and how to improve the stirring effect has been an important issue discussed by experts and scholars in this industry.There are many main ways to improve the stirring effect,among which the common ways are reciprocating stirring,jet stirring and flexible propeller.Yet some scholars find blade under low Reynolds number and produce hybrid isolation(Isolated Mixing Region),isolation of fluid mixing effect is very poor,is bad for the mixing of fluid in stirred tank.Using bionics principles a Y-Shaped Flexible-Blade Impeller is developed,by using numerical simulation software ANSYS Fluent software modules in and Transient Structural module respectively with Y-Shaped Flexible-Blade Impeller stirred tank fluid and impeller and the interaction of the two separately has carried on the numerical simulation of computational fluid dynamics,finite element analysis and numerical simulation of fluid-solid coupling,and compared with ordinary rigid paddle stirred tank contrast research,the results show that firm soft impeller stirred tank mixing effect is much better than that of rigid impeller stirred tank.On this basis,the effects of the internal Angle,external Angle and the length of the flexible structure of the rigid-flexible mixer on the stirring effect were studied.The results showed that: with the decrease of the internal Angle of the Y-Shaped Flexible-Blade Impeller,the stirring effect was slightly improved,but the effect was not obvious,and the power consumption was increased.With the increase of the outer Angle of Y-Shaped Flexible-Blade Impeller,the stirring effect was improved obviously and the power consumption was also increased.When the inside Angle is equal to the outside Angle,the shaft power is the minimum and is the optimal value.With the increase of the length of the flexible structure,the stirring effect was significantly improved,and when the flexible length increased to 50 mm,the flow field in the stirring kettle showed asymmetry,and the stirring effect was improved more obviously.Through the numerical simulation of fluid-solid coupling between oil and water of Y-Shaped Flexible-Blade Impeller,it can be found that the mixing time of rigid and flexible impeller is about 33% less than that of rigid impeller.It is also found that the flexible structure can effectively inhibit the formation of concave at the liquid level and further improve the mixing effect.The mixing efficiency of Y-Shaped Flexible-Blade Impeller stirred tank was improved by 58%.