The velocity distribution near the impeller, with high axial velocity and low radial velocity, is the same as ring jet flow.

叶轮区轴向速度较大，径向速度北京化工大学博士学位论文很小，其速度分布与环形射流速度分布类似。

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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。

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