双向潜水贯流泵装置性能试验与数值分析

该文针对城市防洪排涝泵站的特点,研发了2套双向潜水贯流泵装置,并采用CFD(computational fluid dynamics)技术计算了双向潜水贯流泵装置的内流场,分析了灯泡体段对泵装置正反向运行的影响,包括灯泡体段的水力损失、导叶体内部的流态及"S"形叶轮的水力性能,并经试验验证分析了数值计算结果的有效性。计算结果表明,反向运行时导叶体内部流态较好,反向运行工况优于正向运行;正向运行工况流量为4和5m3/s时,导叶体内均出现涡旋;灯泡体支撑件对"S"形叶轮的水力性能影响极小,但对泵装置水力性能影响较大;正向工况时"S"形叶轮所受轴向力小于反向工况。通过泵装置模型性能试验比较了2套泵装置的综合水力特性指标,并给出了供参考的潜水贯流泵装置的结构尺寸,其中导叶体扩散角为3°,灯泡体长度为2.43D、灯泡体直径为0.46D、泵装置总长为13.45D(D为叶轮名义直径),灯泡体采用流线型尾部及5片支撑件。

Numerical analysis and performance test on diving tubular pumping system with symmetric aerofoil blade

According to the characteristics of urban flood protection and drainage pump stations,two sets of dividing tubular pumping systems with symmetric aerofoil blade were developed.The three-dimensional fluid flow inside a diving tubular pumping system on dual-directional operation was described using computational fluid dynamics(CFD) technology.The effect of bulb section on the hydraulic performance of pumping system was analyzed,which included the hydraulic loss of bulb section,the internal flow of guide vane and the hydraulic performance of "S"shape impeller vane.Verification and analysis were done to the effectiveness of the numerical simulation results by model test.The results demonstrated that the internal flow pattern of guide vane was steady in the reverse operation conditions,while the flow pattern became turbulent,flow deviation and vortex were appeared in 4 and 5 m 3 /s of the main operation conditions.The hydraulic performance of pumping system in reverse operation conditions was better than that in main operation conditions,and axial force of impellers in which was smaller than that in reverse operation conditions.By comparing the comprehensive property index of two sets of pumping system,structure size of pumping system provided a reference for diving tubular pumping device.Diffusion angle of guide vane was 3°,the length of bulb and pumping system was 2.43 and 13.45D,respectively,and the diameter of bulb was 0.46 D.Bulb has streamlined tail and five supporting parts.