With the decreasing of C1, the radial flow generated by the lower impeller, the axial flow generated by the upper impeller, and the axial flow of the main circulation increased.
降低下层桨的离底高度能加强下层桨的径向流动，并增大上层桨叶轮区和循环区流体的轴向流动。
2
The radial symmetry of this shape helps to coordinate the communication and circulation between different sections of the museum and its other facilities.