竖井型线演变及对泵装置水力性能的影响分析

Shaft Shape Evolution and Analysis of Its Effect on the Pumping System Hydraulic Performance

为研究系列竖井型线的演变规律及其对贯流泵装置内流机理及运行稳定性的影响,在归纳分析竖井型线演变的基础上采用一维水力设计方法设计了4种型体的竖井流道.基于ANSYS CFX对4种不同竖井型体的贯流泵装置进行了三维湍流场的数值计算,定量分析了4种竖井流道的水力性能.引入无因次动量参数分析法对比分析了各竖井流道对泵装置运行稳定性的影响,流量系数K Q在0.317—0.634范围内各方案的泵装置动量参数均随流量系数增大而减小,4种竖井流道对泵装置运行稳定性的影响差异性很小.提出了泵装置多工况性能加权评价指标(M.P.I)定量分析了不同竖井流道对多工况运行时泵装置综合水力性能的影响,该方法可用于不同泵装置水力性能的分析及泵装置方案的优选.为验证数值计算的准确性和可靠性,对泵装置进行了物理模型试验,对比分析结果表明,数值计算的结果是可信的.

In order to study on the evolution law of shaft profile line and the influence of shaft passages on internal flow mechanism and operational stability of pumping system, 4 different shaft passages were designed by using one-dimensional hydraulic design method based on the induction analysis of shaft profile lines. ANSYS CFX soft was used to simulate the threedimensional fluid flow of pumping system, and the hydraulic performance of different shaft inlet passages were analyzed quantitatively. Dimensionless momentum parameter analysis was used to compare the influence of different inlet passages on the operation stability of pumping system. With the increase of flow coefficient, the dimensionless momentum parameter decreases in the flow coefficient range from 0. 317 to 0. 634. Different inlet passages have little effect on the operation stability of pumping system. The effect of different inlet passages on the comprehensive hydraulic performance of pumping system was analyzed comparatively by using the weighted performance of multiple operating conditions evaluation method （M. P. I）, which could be used in comparison and analysis of comprehensive hydraulic performance and scheme optimization of pumping system. For verifying the accuracy and reliability of the calculation results, its performance experiments were conducted. It is found that the calculated results agreed well with the measured results.