若干因素对导叶式混流泵水力性能的影响  

Effects of some factors on hydraulic performance of mixed-flow pump with guide vanes

作　　者：常书平[1] 王永生[1] 苏永生[1] 

机构地区：[1]海军工程大学船舶与动力学院,湖北武汉430033

出　　处：《排灌机械工程学报》2012年第6期646-649,676,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51009142)

摘　　要：为提高导叶式混流泵的水力性能,开展了叶顶间隙、叶轮叶片数、叶轮叶片安放角和叶轮叶片厚度对导叶式混流泵水力性能影响的研究.运用CFD软件Ansys CFX 12.0,基于剪切应力输运(SST)湍流模型和SIMPLEC算法,采用分块结构化网格技术,对导叶式混流泵内流场进行了数值模拟.计算结果表明:导叶式混流泵的扬程、功率和效率都随叶顶间隙的增大而降低;扬程和功率随叶轮叶片数的增加而增大的幅值渐小,叶轮叶片数过多或过少对导叶式混流泵效率都不利;不同叶片安放角时扬程、功率的差别随流量增大而逐渐增大,通过叶片安放角的调整可实现泵最高效率点的偏移并改变高效区的范围;泵最高效率点随叶片厚度减薄而向大流量偏移,且最高效率有所提高.在满足制造工艺与安装要求的前提下,对影响导叶式混流泵水力性能的各因素进行优化选择可提高导叶式混流泵的水力性能.In order to improve hydraulic performance of a mixed-flow pump with guide vanes,effects of several factors such as tip clearance,number of blades,blade angle and blade thickness on the performance were explored numerically.The SST turbulence model and SIMPLEC algorithm in the Ansys CFX 12.0 software were used to simulate the internal flow fields of the pump by means of multi-block structured meshes.The results showed that the head,shaft-power and efficiency are declined with increasing tip clearance.The head and power show gradually less increase with increasing number of blades and too many blades or too few blades are all unfavorable to pump efficiency.The changes in both head and power caused from a variable blade stagger angle become dominated with increased flow rate,suggesting the best efficiency point location and the shape of the efficiency curve are adjustable by altering the angle.The best efficiency point is moved to a high flow rate and the slightly increased peak efficiency is observed with decreasing maximum blade thickness.Under the premise of meeting manufacturing process and installation requirements,those factors optimally chosen can improve hydraulic performance of a mixed-flow pump with guide vanes.

关 键 词：混流泵 叶顶间隙 安放角 叶片数 厚度 

分 类 号：S277.9[农业科学—农业水土工程] TH313[农业科学—农业工程]