叶片出口角对离心泵性能的影响及滑移系数修正
发布时间：2019-01-05 11:15
【摘要】：为研究不同叶片出口角对两级离心泵性能的影响,以25-150/2-30/N型两级矿用潜水离心泵为研究对象,采用计算流体动力学软件CFX,基于N-S方程和SIMPLE算法,选用标准k-ε湍流模型,对4组不同叶片出口角下两级离心泵进行定常数值模拟.模拟得到不同叶片出口角下两级离心泵性能曲线,并对扬程、效率及功率进行对比分析,同时分析泵内部流场的压力和速度分布规律.结果表明:叶片出口角对离心泵性能有明显影响,随着叶片出口角增大,扬程逐渐上升,轴功率则在大流量区趋于平稳;内部流场中,叶轮进口低压区面积扩大,出口高压区面积缩小;叶片压力面低速区增大,叶轮流道靠近叶片压力面处出现旋涡.同时,应用数理统计和回归分析,以不同叶片出口角下离心泵的理论扬程为依据,对斯托达拉滑移公式进行修正.
[Abstract]:In order to study the effect of different vane outlet angles on the performance of two-stage centrifugal pump, the two-stage submersible centrifugal pump of 25-150 / 2-30% N was used as an object of study. The computational fluid dynamics software CFX, was used based on N-S equation and SIMPLE algorithm. A standard k- 蔚 turbulence model was used to simulate four groups of two-stage centrifugal pumps with different blade outlet angles. The performance curves of the two-stage centrifugal pump with different vane outlet angles were obtained, and the lift, efficiency and power were compared and analyzed. The pressure and velocity distribution of the flow field inside the pump was also analyzed. The results show that the blade outlet angle has a significant effect on the performance of centrifugal pump. With the increase of blade outlet angle, the head gradually increases, and the shaft power tends to be stable in the large flow region. In the internal flow field, the area of the low pressure area at the inlet of the impeller is enlarged, the area of the high pressure area at the outlet decreases, and the low speed zone of the blade pressure surface increases, and the vortex appears near the pressure surface of the impeller. At the same time, based on the theoretical head of centrifugal pump with different vane outlet angles, the Stodala slip formula is modified by mathematical statistics and regression analysis.
【作者单位】： 江苏大学国家水泵及系统工程技术研究中心;
【基金】：江苏省自然科学基金资助项目(BK20131256) 江苏高校优势学科建设工程项目
【分类号】：TH311
[Abstract]:In order to study the effect of different vane outlet angles on the performance of two-stage centrifugal pump, the two-stage submersible centrifugal pump of 25-150 / 2-30% N was used as an object of study. The computational fluid dynamics software CFX, was used based on N-S equation and SIMPLE algorithm. A standard k- 蔚 turbulence model was used to simulate four groups of two-stage centrifugal pumps with different blade outlet angles. The performance curves of the two-stage centrifugal pump with different vane outlet angles were obtained, and the lift, efficiency and power were compared and analyzed. The pressure and velocity distribution of the flow field inside the pump was also analyzed. The results show that the blade outlet angle has a significant effect on the performance of centrifugal pump. With the increase of blade outlet angle, the head gradually increases, and the shaft power tends to be stable in the large flow region. In the internal flow field, the area of the low pressure area at the inlet of the impeller is enlarged, the area of the high pressure area at the outlet decreases, and the low speed zone of the blade pressure surface increases, and the vortex appears near the pressure surface of the impeller. At the same time, based on the theoretical head of centrifugal pump with different vane outlet angles, the Stodala slip formula is modified by mathematical statistics and regression analysis.
【作者单位】： 江苏大学国家水泵及系统工程技术研究中心;
【基金】：江苏省自然科学基金资助项目(BK20131256) 江苏高校优势学科建设工程项目
【分类号】：TH311
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