螺旋离心式诱导轮对旋流泵力学特性的影响  

Effect of screw centrifugal inducer on mechanical characteristics of vortex pump

作　　者：权辉[1,2] 程静 彭国义 QUAN Hui;CHENG Jing;PENG Guoyi(College of Energy and Power Engineering,Lanzhou University of Technology, Lanzhou, Gansu 730050, China;College of Engineering, Nihon University, Kiriyama 963-8642, Japan)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]日本大学工学部,郡山963-8642

出　　处：《排灌机械工程学报》2021年第4期345-350,357,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51609113,51969014);中国博士后基金资助项目(2018M633651XB);甘肃省自然科学基金资助项目(20JR5RA456);山东省博士后创新基金项目;兰州理工大学红柳优秀青年基金项目;甘肃省杰出青年基金项目(20JR10RA204)。

摘　　要：为了优化旋流泵输送含复杂介质、固相颗粒流体的能力和提高固液两相流输送效率,在叶轮前加置具有导向和推进作用的螺旋离心式诱导轮.通过对150WX-200-20型旋流泵进行数值计算及试验,获得了有、无诱导轮式旋流泵的性能变化,在此基础上,将旋流泵的力学特性与流动特性结合起来,分析螺旋离心式诱导轮对旋流泵力学特性的影响.研究结果表明,无叶腔内流体在诱导轮作用下,流体的运动形态发生变化,产生了旋涡、二次流等现象,加剧了压力脉动的强度,但压力脉动幅值有减小的趋势;蜗壳内压力脉动强度不仅与监测点和隔舌的相对位置有关,也和监测点所在流面的截面面积存在一定联系,当监测点所在断面面积既能保证流体受蜗壳的约束,且流体流动更加均匀时,该监测点的压力脉动越小;加置诱导轮后,进入叶轮流体由轴向运动转为径向运动,从而削弱轴向力的大小,同时,单叶片诱导轮非对称结构也会加剧波动变化.这一研究对了解旋流泵内的压力脉动变化、削弱轴向力及提高泵运行的稳定性具有重要意义.In order to optimize the performance of the vortex pump to transport complex medium and solid phase particle fluid and improve the efficiency of solid-liquid two-phase flow,the screw centrifugal inducer with guiding and propelling function was added in front of the impeller.Through the nume-rical calculation and test of 150WX-200-20 vortex pump,the performance change of vortex pump with and without inducer was obtained.On this basis,the mechanical characteristics of vortex pump and flow characteristics were combined to analyze the influence of screw centrifugal inducer on the mechanical characteristics of vortex pump.The results show that the fluid movement pattern in the bladeless cavity changes under the action of the inducer,generating vortices,secondary flows and other phenomena,intensifying the intensity of pressure pulsation,but the amplitude of pressure pulsation tends to decrease.The pressure pulsation intensity in the volute is not only related to the relative position of the monitoring point and the tongue,but also related to the cross section area of the flow surface where the monitoring point is located.When the section area of the monitoring point can ensure that the fluid is constrained by the volute and the fluid flow is more uniform,the pressure pulsation of the monitoring point is smaller.The addition of inducer will make the impeller fluid from the axial movement to radial movement,so as to weaken the size of the axial force.And meanwhile,the asymmetric structure of single blade inducer will aggravate the pulsation.This research is of great significance to understanding the change of pressure pulsation in the vortex pump,weakening the axial force and improving the running stability of the pump.

关 键 词：旋流泵 诱导轮 压力脉动 轴向力 径向力 

分 类 号：TH311[机械工程—机械制造及自动化]