张人会,陈学炳,郭广强,李仁年.低比转数离心泵叶轮内流场重构与模态分析[J].农业机械学报,2018,49(12):143-149.
ZHANG Renhui,CHEN Xuebing,GUO Guangqiang,LI Rennian.Reconstruction and Modal Analysis for Flow Field of Low Specific Speed Centrifugal Pump Impeller[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(12):143-149.
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低比转数离心泵叶轮内流场重构与模态分析   [下载全文]
Reconstruction and Modal Analysis for Flow Field of Low Specific Speed Centrifugal Pump Impeller   [Download Pdf][in English]
投稿时间:2018-05-07  
DOI:10.6041/j.issn.1000-1298.2018.12.018
中文关键词:  离心泵  叶轮  本征正交分解法  径向基函数  优化设计  模态分析
基金项目:国家重点研发计划项目(2016YFB0200901)、国家自然科学基金项目(51469014)和甘肃省陇原创新人才计划项目
作者单位
张人会 兰州理工大学 
陈学炳 兰州理工大学 
郭广强 兰州理工大学 
李仁年 兰州理工大学 
中文摘要:针对传统离心泵水力性能优化设计的复杂性,提出采用本征正交分解-径向基函数(POD-RBF)混合代理模型方法对离心泵叶轮内流场进行重构分析。由三次Bezier曲线对低比转数离心泵二维叶片型线进行参数化控制,通过对叶片包角、进出口安放角等控制参数进行适量的扰动得到叶片型线的样本集。由叶片型线参数及叶轮CFD内流场数据构成样本的快照矢量集,根据几何相似及网格变形方法插值得到各相似节点的流场参数,依据本征正交分解法(POD)将快照集分解为一系列正交基的线性组合。由径向基函数(RBF)拟合目标叶型所对应的正交基系数,实现了对目标叶轮内流场的重构。采用POD-RBF方法对MH48-12.5型低比转数离心泵叶轮内流场进行了重构,其压力预测均方根误差为0.84%,速度预测误差基本在0.5m/s以内,流场预测所需时间约为CFD计算的1/240。对样本集进行POD基模态分析,得到了各阶基模态流场特征及能量分布特性。
ZHANG Renhui  CHEN Xuebing  GUO Guangqiang  LI Rennian
Lanzhou University of Technology,Lanzhou University of Technology,Lanzhou University of Technology and Lanzhou University of Technology
Key Words:centrifugal pump  impeller  proper orthogonal decomposition  radial basis function  optimization design  modal analysis
Abstract:According to the complexity of traditional hydraulic performance optimization design of centrifugal pump, the hybrid surrogate model method which is the combination of proper orthogonal decomposition and radial basis function was proposed for the flow reconstitution of centrifugal pump impeller. The blade of low specific speed centrifugal pump was parameterized by cubic Bezier curve, and the experiment samples can be designed by introducing small perturbation of control parameters which included wrap angle, inlet and outlet blade angles. The snapshot set consisted of the control parameter for blade shape and the flow field data. According to the geometric similarity of the impeller flow passage and the mesh deformation technology, the flow field data of the similar position were interpolated. The snapshot set can be decomposed as linear combination of orthogonal basis by using proper orthogonal decomposition. The orthogonal basis coefficients for the objective blade were fitted by using radial basis function. The flow field data of the objective impeller were reconstructed. In the calculation case for the type of MH48-12.5 centrifugal pump, the flow field in impeller was reconstructed. The root-mean-square error for pressure prediction was 0.84%, and the velocity prediction error was within 0.5m/s. The computation time for the flow field prediction was less than 1/240 of the CFD. POD base modal analysis was carried out on the sample set. The base modal characteristic of flow field and its energy distribution were analyzed.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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