农业工程学报2012，Vol.28Issue(17)：32-37,293,7.DOI:10.3969/j.issn.1002-6819.2012.17.005
轴流泵叶轮出口尾迹区非定常压力和速度场特性
Property of unsteady pressure and meridional velocity in wake region of axial-flow pump impeller
摘要
Abstract
In order to study the rotor-stator interaction in the wake region of the axial-flow impeller, the axial-flow pump model for South-to-North Water Diversion Project model was simulated based RNG k-e turbulence model and the SIMPLE algorithm. The calculated values by steady simulation were compared with the experimental results to verify the computational grid and the applicability of turbulence model, and the unsteady field was simulated based on the steady results. The numerical results show that the relative error of Head is 4.56% and efficiency is 2.78% in optimal condition compared with the experimental data. In small flow rata condition, three peaks and three second peaks occur on the meridional velocity at axial flow impeller outlet in the circumferential direction. As the flow rate increases, the number of the velocity peak at impeller outlet is same to the guide-vane blade number. In the small flow rate and design conditions, the single-cycle time-domain of the pressure fluctuation in the impeller wake region appears three peaks and the additional three secondary peaks when flow rate increases. The main frequency of pressure fluctuation in different flow conditions is mainly blade frequency, and the other harmonic frequencies are the times of the fundamental blade frequency. The amplitude of pressure fluctuation frequency increases rapidly as the flow rate decreases.关键词
轴流泵叶/轮/数据模拟/非定常流动/尾迹/轴面速度压力脉动Key words
axial-flow pump/ impeller/ computer simulation/ unsteady flow/ velocity wake/ meridional velocity/ pressure fluctuation分类
机械制造引用本文复制引用
张德胜,施卫东,李通通,张华,关醒凡..轴流泵叶轮出口尾迹区非定常压力和速度场特性[J].农业工程学报,2012,28(17):32-37,293,7.基金项目
国家自然科学基金(51109093,51079063) （51109093,51079063）
江苏省自然科学基金(BK2011503) （BK2011503）
国家博士后科学基金(2011M500117) （2011M500117）
江苏省博士后基金(1101019B) （1101019B）
江苏大学高级人才启动基金(11JDG038). （11JDG038）
