中文摘要：

平衡腔内的压力分布是浮动叶轮实现轴向力自动平衡的关键所在。引用加大后的叶轮后密封环直径和叶轮平衡孔的面积这2个重要设计参数，建立不同参数组合下的3BA一6单级单吸离心泵三维模型，运用CFD理论对其进行数值模拟，得到平衡腔内的压力分布，并进行轴向合力计算与平衡分析，同时在水泵开式试验台上实测平衡腔内的压力。结果表明：当水泵工作流量位于0．002～0．006m3／s这一区域时，取k=1．2，A=7．07mm2，水泵可以通过采用浮动叶轮来实现其轴向力的平衡。平衡腔内压力P为相应工况下扬程的13％～20％。模拟值与实测值吻合较好，验证了数值方法的正确性。运用CFD技术，通过参数的改变，找到最优设计方案，为其结构设计提供重要的实践指导意义。

英文摘要：

The pressure distribution in balance chamber is the key technology that centrifugal pump with floating impeller balances axial force automatically. Based on two important parameters, ring seal diameter of impeller and area of balancing hole, different combination groups were formed to construct the 3-D model of 3BA-6 single stage single suction centrifugal pump. Through the numerical simulation after the model by computational fluid dynamics （CFD） theory, the pressure distributions in balance chamber were obtained. Then axial compound stress was calculated and balance analysis was made. Simultaneously, the pressure in balance chamber was tested practically. The results show that axial force of centrifugal pump with floating impeller can be balanced under the condition that rate of flow amounted to 0.002-0.006m3/s, and when k=1.2, A=7.07 mm2. And the pressure in balance chamber is 13%-20% of lift corresponding operating condition. Simulated values are closely matched with the measured value, which proved the appropriateness of numerical simulation. The practical significance is supplied by using CFD technology and changing parameters to design the most proper structure.