The blade number of impeller is an

叶轮的叶片数是泵的重要设计参数，严重影响泵的性能。<br>目前，研究主要集中在轴流泵的性能特点上，叶片数<br>对内流场的影响以及离心泵的特性尚不完全清楚。因此，采用数值<br>模拟和实验验证的方法来研究叶片数量对<br>离心泵流场和特性的影响。模型泵的设计比转速为92.7，叶轮带有5个叶片。刀片编号更改为4、6<br>7，与套管等几何参数保持恒定。<br>使用商业代码FLUENT在非空化和空化条件下模拟并预测了具有不同叶片数的离心泵的内部流场和特性。<br>具有不同叶片数的叶轮是通过快速原型制造的，其特性在开环中进行了测试。<br>预测值与实验结果的比较表明，该预测结果令人满意。<br>扬程，效率和所需净正吸力扬程的最大预测结果差异分别为4.83％，3.9％和0.36 m。<br>流动分析表明，叶片数量的变化对叶片入口后面的低压区域<br>和叶轮中的喷流结构具有重要影响。随着叶片数的增加，模型泵的扬程也增加，<br>效率和空化特性的可变调节复杂，但是每个叶片都有最佳的叶片数。该<br>研究结果对离心泵的水力设计很有帮助。

叶轮叶片数量是泵的重要设计参数，对泵的特性影响很大。<br>目前，调查主要集中在轴流泵的性能特性，叶片数量对<br>离心泵的内流和特性尚未完全了解。因此，数值的方法<br>仿真和实验验证用于研究叶片数对流场的影响和<br>离心泵。模型泵的设计特定速度为 92.7 和带 5 个叶片的叶轮。刀片编号变化为 4、6、<br>7 与套管和其他几何参数保持不变。离心泵的内部流场和特性<br>使用商业代码 FLUENT 在非气穴和气穴条件下模拟和预测不同的刀片编号。的<br>具有不同叶片编号的叶轮采用快速原型制作，其特性在开环中测试。的<br>预测值与实验结果的比较表明预测结果得到满足。最大值<br>头部、效率和所需净正吸头预测结果的差异值分别是4.83%、3.9%和0.36米。<br>流量分析显示，叶片编号的变化对叶片入口后面的低压区域区域有重要影响<br>和叶轮中的喷射唤醒结构。随着叶片数量的增加，模型泵的头部也增加，可变<br>效率和气穴特性的调节是复杂的，但每个刀片数都有最佳值。的<br>研究结果对离心泵的液压设计有一定帮助。

The blade number of impeller is an important design parameter of pumps, which affects the characteristics of pump heavily. At present, the investigation focuses mostly on the performance characteristics of axis flow pumps, the influence of blade number on inner flow filed and characteristics of centrifugal pump has not been understood completely. Therefore, the methods of numerical simulation and experimental verification are used to investigate the effects of blade number on flow field and characteristics of a centrifugal pump. The model pump has a design specific speed of 92.7 and an impeller with 5 blades. The blade number is varied to 4, 6, 7 with the casing and other geometric parameters keep constant. The inner flow fields and characteristics of the centrifugal pumps with different blade number are simulated and predicted in non-cavitation and cavitation conditions by using commercial code FLUENT. The impellers with different blade number are made by using rapid prototyping, and their characteristics are tested in an open loop. The comparison between prediction values and experimental results indicates that the prediction results are satisfied. The maximum discrepancy of prediction results for head, efficiency and required net positive suction head are 4.83%, 3.9% and 0.36 m, respectively. The flow analysis displays that blade number change has an important effect on the area of low pressure region behind the blade inlet and jet-wake structure in impellers. With the increase of blade number, the head of the model pumps increases too, the variableregulation of efficiency and cavitation characteristics are complicated, but there are optimum values of blade number for each one. The research results are helpful for hydraulic design of centrifugal pump.<br>