As shown in figure 4-7, velocity ne

As shown in figure 4-7, velocity nephograms on the surfaces of six different centrifugal stirred tanks y = 0 are given. As can be seen from the diagram, the maximum speed appears at the top of the blade, indicating that the flow is more severe at and near the top of the impeller. The Centrifugal flow EI is 0,0.15,0.3,0.45 respectively. With the increase of centrifugal flow rate, the range of small flow velocity below the center of flow channel decreases gradually. When the ECCENTRICITY ratio is 0.45, the minimum value is 0.45, which shows that increasing the eccentricity ratio can reduce the range and size of the low velocity zone in the range of small flow rate, so that the flow rate can fully participate in the mixed flow stirring system. In addition, it can be seen that, with the increase of ECCENTRICITY, the formation of the narrow eccentricity of the wall near the bottom of the tank in the low speed range, especially near the bottom of the wall, is also reduced, avoid the formation of dead zones, such as entering the tank can be fully mixed, mixing effect and efficiency can be improved. The ECCENTRICITY rate increases to 0.6 near the high speed zone, which is still concentrated in the mixing, but the flow distribution in other areas of the tank is obviously different from the first 4 working conditions, the eccentricity speed is greater than the strangely wide narrow edge, because the blade flow is quickly ended, part of the wall, one part of which, although there is sufficient space for the full development and maintenance of the flow pattern, it can be made by Fig. 4-7(e) , which is due to the side flow being too wide during the conveying process, resulting in the loss of energy flow at the impeller tail. When it reaches the wider side, there is not enough energy to drive the airflow. Therefore, if the eccentric side of the air flow is fully driven and fully involved in the mixing system, the mixing speed must be increased, which not only increases the energy consumption, but also puts forward higher requirements for the structural stability of the mixing vessel.