农业机械学报2017，Vol.48Issue(12)：141-146,113,7.DOI:10.6041/j.issn.1000-1298.2017.12.016
立式轴流泵装置进水流道出口流态与脉动试验分析
Experiment and Analysis on Outlet Flow Pattern and Pressure Fluctuation in Inlet Conduit of Vertical Axial-flow Pumping System
摘要
Abstract
Pressure fluctuation in vertical axial-flow pumping system caused by outlet flow pattern of inlet conduit is the primary sources of operation instability.By means of pressure transduces and red threads installed in outlet section of inlet conduit,fluctuating pressure signals were obtained and recorded under various operating conditions.The signals in time and frequency domains of the signals were analyzed by using short-time Fourier transform method.The results showed that when the flow rate was less than 0.7Qbep,the deviation direction of red threads of internal wall were the same as the impeller rotating direction in inlet conduit,while the flow rate was larger than 0.7Qbep,the deviation direction of red threads of internal wall was along the axial direction.With the increase of rotational speed,the pulsating amplitude of each measuring point was increased at Q ＜ 0.7Qbep,while with the increase of rotational speed,the pulsating amplitude was gradually decreased.The pulsating amplitude was decreased firstly and then increased with the increase of flow rate at the same rotational speed,and the pulsating amplitude was the minimum under the optimum operating condition.The main frequency of each measuring points was four times of rotational frequency at different rotational speeds.The subdominant frequency of each measuring points was one time of rotational frequency in Qbep.Both flow rate and rotational speed had significant influence on the subdominant frequency of outlet section in inlet conduit under small and large flow rate conditions.With the increase of rotational speed,the increase amplitudes of measuring point pulsating amplitudes were different under different operating conditions.The pressure fluctuation amplitude was larger in the frequency range of 0 ～ 8 times of rotational frequency for inlet conduit outlet section at different rotational speed.关键词
轴流泵装置/进水流道/试验/流态/压力脉动Key words
axial-flow pumping system/inlet conduit/test/flow pattern/pressure fluctuation分类
机械制造引用本文复制引用
杨帆,赵浩儒,刘超,何继业,汤方平..立式轴流泵装置进水流道出口流态与脉动试验分析[J].农业机械学报,2017,48(12):141-146,113,7.基金项目
国家自然科学基金项目(51609210)、江苏省自然科学基金项目(BK20150457)、中国博士后自然科学基金项目(2016M591932)、江苏省博士后科研资助计划项目(1601161B)、流体及动力机械教育部重点实验室开放课题项目(szjj2016-078)和江苏高校优势学科建设工程项目(PAPD) （51609210）
