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当前位置: 首页 > 文章 > 隔墩对轴流泵装置直管式出水流道内流及脉动的影响 农业机械学报 2018 (5) 212-217
Position: Home > Articles > Influence of Division Pier on Pressure Fluctuation and Internal Flow Pattern in Outlet Conduit of Axial-flow Pumping System Transactions of the Chinese Society for Agricultural Machinery 2018 (5) 212-217

隔墩对轴流泵装置直管式出水流道内流及脉动的影响

作  者：
杨帆;陈世杰;刘超;王茂运;周济人
关键词：
轴流泵装置;出水流道;隔墩;流场;压力脉动;模型试验
摘  要：
为分析隔墩对直管式出水流道内部流态及压力脉动的影响规律,基于立式轴流泵装置物理模型,采用在直管式出水流道壁面布置丝状红线和压力脉动传感器的方法进行了试验。结果表明,小流量工况时,有无隔墩的直管式出水流道内壁面红色丝线均呈大角度倾斜状;在最优工况和大流量工况时,直管式出水流道内壁面红色丝线趋于水平状,流量越大红色丝线越趋于水平。无隔墩的直管式出水流道脉动幅值均方根的平均值均高于有隔墩的直管式出水流道脉动幅值均方根的平均值。相同转速时,有无隔墩的直管式出水流道各监测点的脉动幅值均方根均随流量的增大而减小;相同流量比时,各监测点的脉动幅值均方根随转速的增加而增加。不同转速下各最优工况时,有隔墩的直管式出水流道各监测点的脉动主频与转频呈整倍数关系。隔墩对直管式出水流道内部水流流态有一定的调整作用,可降低脉动幅值,但不同工况时隔墩对直管式出水流道内流的改善效果还取决于导叶体出口剩余环量和流量。
译  名：
Influence of Division Pier on Pressure Fluctuation and Internal Flow Pattern in Outlet Conduit of Axial-flow Pumping System
作  者：
YANG Fan;CHEN Shijie;LIU Chao;WANG Maoyun;ZHOU Jiren;School of Hydraulic Energy and Power Engineering,Yangzhou University;Jiangsu Provincial Flood Control and Drought Relief Center;
关键词：
axial-flow pumping system;;outlet conduit;;division pier;;flow field;;pressure fluctuation;;model test
摘  要：
In order to investigate the influence of division pier on the pressure fluctuation and internal flow of outlet conduitat different rotational speeds,some high-precision digital pressure sensors CY302 and red threads were installed in the straight outlet conduit,fluctuating pressure signals were obtained and recorded under different operating conditions. The results showed that read threads were inclined under the small flowrate condition,while red threads were horizontal approximately under the optimal and large flowrate conditions. With the increase of flowrate,read threads were more horizontal. Under the same conditions of rotational speed and flowrate,the average values of pulsating amplitude root mean square in the straight outlet conduits without division pier were larger than that in the straight outlet conduits with division pier. With the increase of flowrate,the root mean square of pulsating amplitude was decreased gradually at the same rotational speed for straight outlet conduits with and without division pier. At the same flowrate,with the increase of rotational speed,the root mean square of pulsating amplitude was increased gradually for straight outlet conduits with and without division pier. The main frequency of each measuring points was the integer multiple relationship with the rotational frequency under the optimal operating condition of different rotational speeds for the straight outlet conduit with division pier,while the main frequency of each measuring points was not that. Division pier can improve flow pattern of straight outlet conduit,decrease the pulsating amplitude,but the improvement effect was also depended on guide vane outlet velocity circulation and flowrate under different operating conditions.

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