Influence of specific speed on hydraulic performances and pressure fluctuations in mixed-flow pumps  

作　　者：FU Yanxia JIA Qi SHEN Yang PACE Giovanni 

机构地区：[1]School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China [2]Zhenjiang Fire and Rescue Division,Zhenjiang,Jiangsu 212000,China [3]Sitael S.P.A.,Pisa 56121,Italy

出　　处：《排灌机械工程学报》2023年第10期981-987,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：National Natural Science Foundation of China(51976078);Senior Personnel Scientific Research Foundation of Jiangsu University:(15JDG073);Open Research Subject of Key Laboratory of Fluid and Power Machinery,Ministry of Education(szjj2016-065)。

摘　　要：A series of steady and unsteady numerical calculations of the internal flow in mixed-flow pumps with three different specific speeds were carried out based on the N-S equation coupled with the standard k-εturbulence model under different operating conditions to investigate the relationship between the impeller specific speed and the pump performance as well as pressure pulsations.Meanwhile,the pump performance and pressure pulsations inside the mixed-flow pump with three different specific speeds were also analyzed and compared with the corresponding test data.From the results,the averaged deviations between the predicted and tested head among different impellers are below 5%,and with respect to the equivalent impeller specific speeds of 280 and 260,the values are 4.30%and 3.69%,respectively.For all the impeller schemes,the best efficiency point of the mixed-flow pump is found at the flow rate of 1.2 Q_(d) and the higher head deviation occurs at lower flow rates.Especially,it can be found that the specific speed has a slight effect on the pressure fluctuation in the impellers.Eventually,it is determined that the pump performance curves calculated by numerical simu-lations have good agreement with the relevant experimental results,which verifies that the numerical methods used in the present study are accurate to a certain extent.Furthermore,the results also provide some references to the pressure pulsation analysis and the performance improvement of the mixed-flow pump design.

关 键 词：mixed-flow pumps impeller specific speed hydraulic performance pressure pulsation numerical simulation EXPERIMENT 

分 类 号：S277.9[农业科学—农业水土工程]