立式管道泵进水弯管和叶轮的参数化分析与验证  

Parametric analysis and verification of curved inlet pipe and impeller of vertical inline pump

作　　者：司乔瑞[1] 唐亚静 甘星城 李浩[1,2] 杨松[3] Si Qiaorui;Tang Yajing;Gan Xingcheng;Li Hao;Yang Song(National Research Center of Pumps,Jiangsu University,Zhenjiang 212013,China;Key Laboratory of Water-Saving Agriculture of Henan Province,Farmland Irrigation Research Institute,of Chinese Academy of Agricultural Sciences,Xinxiang 453003,China;Nuclear Power Institute of China,Chengdu 610213,China.)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,镇江212013 [2]中国农业科学院农田灌溉研究所河南省节水农业重点实验室,新乡453003 [3]中国核动力研究设计院,成都610213

出　　处：《农业工程学报》2020年第17期54-63,F0003,共11页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51976079);中国博士后科学基金项目(2019M661745);江苏省产学研合作项目(BY2019059);江苏省研究生科研创新计划项目(KYCX20_3018)。

摘　　要：管道泵的肘形弯曲进口结构影响了叶轮的入流,导致管道泵内部流动特性复杂,整体性能下降。为了探究管道泵不同设计参数对内部流动的影响,该研究基于三维非定常雷诺时均Navier-Stokes方程,结合剪切应力传输模型对管道泵入流畸变特性展开了数值模拟,并进行了试验验证。同时,选取了进水弯管和叶轮的40个设计参数,使用拉丁超立方设计方法创建了300组设计样本,通过Pearson相关性分析,数值研究了进水弯管和叶轮的设计参数对管道泵效率、扬程及入流不均匀度的影响。结果表明:数值计算结果与试验结果的吻合良好,模拟方法具有较好的预测精度;进口流道内发现了伴有二次流涡对的流动分离区,且其内部流动分布不对称,在设计流量和小流量工况下,进口流道内部流动分别以反向涡对和回流旋涡为主;管道泵的性能与叶片安放角及叶片数显著相关。研究表明具有40°~50°进口安放角、20°~40°出口安放角及较大进水弯管长度的管道泵具有更好的性能和稳定性,此区间内的样本相较于原始模型效率平均提高了5%。研究结果可为管道泵的设计优化提供参考。The vertical inline pump is a centrifugal pump with the elbowed inlet pipe,which has excellent characteristics of simple structure,small volume,easy for installation,and so on.Therefore,it is widely applied in where the constraint is installation space.However,the curved inlet structure also has a negative impact on the inflow conditions before the impeller,which will result in the complex flow phenomenon and decrease of the pump performance.In order to study the features of flow distortion and its impact on the performance and stability of the inline pump,the three-dimensional unsteady Reynolds average Naiver-Stokes equations with the shear stress transfer model were solved by commercial CFD code for the selected pump model in this study.Meanwhile,the Bezier curves were adopted to fit the profiles of the curved inlet pipe and the impeller.Thirty-nine coordinates of the control points of those Bezier curves and the number of the impeller blades were selected as the design variables for the parametric design of the inlet pipe and the impeller.Based on the Latin Hypercube Sampling method,300 groups of cases were generated in the decision space,and the influence of these design variables on the inflow features and the performance of the inline pump was studied based on Pearson correlation analysis.In order to ensure the reliability of the numerical simulation,a validation experiment on the original pump was carried out.The comparison between the computational results and experimental results showed that the calculation has good accuracy on flow prediction,which could meet the requirements of further study.During the numerical investigation on the original case,a large flow separation area with a pair of secondary flow vortices was found in the inlet passage,which extended along the outer side of the inlet pipe,blocked the flow passage seriously,and deteriorated the outflow conditions of the inlet pipe.Under the nominal and part-load conditions,the main flow features in the inlet pipe were reverse vortex pair and bac

关 键 词：泵 数值模拟 模型 入流畸变 参数化分析 进水弯管 

分 类 号：TH311[机械工程—机械制造及自动化] O357.1[理学—流体力学]