基于PIV测试的螺旋离心泵内部流动特性研究  

Internal Flow Characteristic of Screw Centrifugal Pump Based on PIV

作　　者：权辉[1,2] 李仁年[1,2] 苏清苗 韩伟[1,2] 蒋雷[1,2] 金毅[1,2] 

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050 [2]甘肃省流体机械及系统重点实验室,兰州730050 [3]兰州华宇航天技术应用有限责任公司,兰州730000

出　　处：《农业机械学报》2015年第4期28-32,58,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51079066;51209113);甘肃省自然科学基金资助项目(0906ZTB093)

摘　　要：为了研究螺旋离心泵内部流体流动机理,通过对螺旋离心泵改造和透明化处理,应用PIV测试技术,取螺旋离心泵轴截面和径向截面分阶段获得各截面上速度变化,进而得到各个截面上的流动信息,揭示螺旋离心泵内部流动状态。结果表明:整个轴向截面中,物理参量扰动大于径向截面,尤其在叶轮流道的轴截面,有明显的涡旋出现。在深入蜗壳的叶轮流道中,涡旋数量明显增加,这是因为该区域的流体方向在叶轮旋转和蜗壳使其变化过程中,同时受力分配促进了这种变化;在径向截面上,能明显看到速度方向和流线沿一个方向旋转,同时,流体均有由中心向外运动的趋势,这是叶轮螺旋段螺旋推进作用后又一个重要组成部分离心段的离心力作用决定的,叶轮的螺旋段螺旋推进作用和离心段的能量转换相互配合,构成了螺旋离心泵工作的过程。In order to research the internal flow mechanism of screw centrifugal pump, the PIV testing technology was used after the pump was improved with the transparent handling. The velocities of shaft section and radial section at different stages were obtained. The flow of each section was received and then the internal flow in screw centrifugal pump was revealed. The results showed that the perturbation of physical parameters at the whole shaft section was bigger than the one at radial section. The vortex was appeared obviously at shaft section of impeller passage and the vortex volume increased significantly in the impeller passage which was deep into volute. With the depth of the fluid flow, it caused fluid force reallocation by the spiral vane segment. At radial section, velocity was rotated along with the direction of the flow line. Simultaneously, there was a trend that fluid moved from the center to the outside due to the centrifugal force from the centrifugal section, which played an important role after the spiral section. The spiral propulsion of spiral section and the energy conversion of centrifugal section were cooperated with each other to make up the working process of screw centrifugal pump.

关 键 词：螺旋离心泵 内部流动特性 截面 粒子图像测速 

分 类 号：TH311[机械工程—机械制造及自动化]