叶片进口边位置对船用离心泵性能数值模拟与试验对比

为了研究叶片进口位置对船用离心泵内部流动和性能的影响。针对一国内生产的NSL125-415/A02型船用离心泵,在不改变原始叶轮设计的基础上,运用泵与旋转机械专业设计工具CFturbo分别将叶片进口边两次前移和两次后移,设计了四种新的叶型。然后采用全粘性三维湍流数学模型数值模拟计算了5组(包括原型泵)不同工况下的船用离心泵内流场,对比了不同位置叶片进口边对船用泵流量-扬程、流量-效率等外特性曲线以及叶轮内部流场在不同工况下的流动分布,并且将原型泵数值计算结果与试验进行了比对。结果表明：适当将叶片进口边位置向叶轮轮毂处偏移,可以相对改善叶轮内部流场分布情况,降低叶轮出口位置附近湍动能强度；在一定范围内,随着叶片进口边位置向轮毂处偏移,船用离心泵扬程有所提高,整体效率略有增加,且高效区域面积变大；通过与试验对比,运用数值计算方法来预测船用离心泵内部复杂三维流动是可行的。

Numerical Simulation and Experimental Comparison on Hydraulic Performance of Blade Inlet of Centrifugal Pump for Warship

In order to study the influence of blade inlet edge of centrifugal pump for warship internal flow and performance. According to the NSL125-415/A02 type domestic production of centrifugal pumps for warship. Without changing the original impeller design, and on the basis of using the pump and the rotating machinery professional design tools CFturbo to respectively inlet side two forward and backwards, to construct four new leaf type. And then USES the three-dimensional turbulent flow mathematical model of viscous numerical simulation to calculate the 5 groups under different working conditions of the flow field in the centrifugal pump for warship. Comparative analysis of the different blade flow inlet position of the pump head and flow - efficiency curve and other characteristics of the flow field within the impeller under different conditions of flow distribution. And then compare to the numerical simulation and experimental results. The results show that appropriate to blade inlet edge position offset wheel hub, can effectively improve the flow field distribution within the impeller, and reduce the impeller outlet of turbulent kinetic energy. Within a certain range, with the blade inlet edge position shift toward hub and centrifugal pump for warship head, the overall efficiency increased slightly and area larger colleges and universities. By comparison with the experiment, and using numerical simulation method to predict centrifugal pump for warship internal complex three-dimensional flow and hydraulic performance is feasible.