农业机械学报2018，Vol.49Issue(3)：144-149,165,7.DOI:10.6041/j.issn.1000-1298.2018.03.017
轴流泵装置出水流道内流脉动与流动噪声试验分析
Experiment Analysis on Flow-induced Pulsation and Noise in Outlet Conduit of Vertical Axial-flow Pumping System
摘要
Abstract
The pressure pulsation and flow-induced noise of outlet conduit have become two of important problems which have negative effect on axial-flow pumping system reliability.In order to investigate the flow-induced noise and pressure fluctuation characteristics of outlet conduit in axial-flow pumping system under different operating conditions,the fluctuating pressure and noised signals were obtained by pressure transduces mounted at different positions and a hydrophone in middle of outlet conduit.The experimental data were further analyzed by using short-time Fourier transform method at speeds of 1 450 r/min,1 800 r/min and 2 200 r/min.The results showed that with the increase of rotational speed,the root mean square of the pulsating amplitude of each measuring point was increased in the same flow rate ratio.With the increase of flow rate ratio,the root mean square of pulsating amplitude was decreased for each measuring point at the same rotational speed,while there were differences in the dominant frequency of each measuring point in different flow rate ratios.The latter was adjacent to 51 Hz for the same measuring point at different flow rate ratios with different rotational speeds.The dominant frequency and subdominant frequency were not multiple relation with rotational frequency.The dominant frequency and subdominant frequency was in the range of 200 Hz.With the increase of rotational speed,sound pressure level of flow-induced noise was increased in the same flow rate ratio.With the increase of flow rate,the sound pressure level of flow-induced noise was decreased firstly and then increased at the same rotational speed.The rotational speed had great influence on sound pressure level of flow-induced noise under the optimal condition.The research result had reference value for study on pressure pulsation and flowinduced noise in outlet conduit of pumping system.关键词
轴流泵装置/出水流道/压力脉动/流动噪声/试验Key words
axial-flow pumping system/outlet conduit/pressure fluctuation/flow-induced noise/test分类
机械制造引用本文复制引用
杨帆,高慧,刘超,赵浩儒,汤方平..轴流泵装置出水流道内流脉动与流动噪声试验分析[J].农业机械学报,2018,49(3):144-149,165,7.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)、中国博士后科学基金项目(2016M591932)、江苏省博士后科研计划项目(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）
