离心水泵叶轮工作曲面有限元分析及优化设计
发布时间：2018-10-14 17:58
【摘要】：随着工农业的发展,泵的应用范围不断扩大。对泵的水力特性和运行稳定性要求越来越高。离心泵叶轮是离心水泵的重要过流部件,其工作性能、效率直接影响着离心泵的工作性能。叶轮在工作状态下受离心力和水压力的共同作用,其受力状况复杂。传统的设计方法工作量大、效率低。随着数值模拟技术和有限元分析法在叶轮机械领域的应用,为结构设计及内部流场分析提供了依据。 本文以一个中高比转数的离心泵为对象研究了叶轮内流场模拟、叶轮的ANSYS静力和模态分析以及叶轮几何参数优化。首先在UG中进行叶轮实体的三维建模,将模型进行网格划分,并利用计算流体动力学(CFD)技术得到了离心泵叶轮内部流动的压力、速度分布和叶片上的压力分布状况。通过ANSYS进行静力和模态分析。最后用遗传算法工具箱优化了叶轮的几何参数。 通过离心泵的木模图建立了叶轮的三维实体模型,采用曲面工具分析了叶轮叶片的曲面质量,使叶轮的造型更加的合理准确,提高了叶轮设计的效率。 介绍了离心泵内部流动数值模拟的理论和方法,在GAMBIT中对叶轮进行网格划分和边界条件设定。使用FLUENT软件对离心泵内部流场进行求解,准确得到了离心泵内部流动的压力、速度分布情况,输出了分布于叶片上的压力数据。 针对以水为介质的离心水泵叶轮的强度和模态分析的还比较少,本文采用ANSYS的APDL程序语言把流场分析输出的压力数据加载到叶片上,实现了离心泵的流固耦合分析,并进行了叶轮静力分析和模态分析,得到了水压力和离心力作用下叶轮的应力应变情况及频率特性,计算结果表明设计工况下叶轮工作可靠。 建立了以叶轮的圆盘摩擦损失、水力损失和容积损失最小为目标函数,编写了目标函数的M文件,确定了优化变量的取值范围,使用Matlab的遗传算法工具箱对叶片的进口、出口角和出口宽度进行了优化,经理论反算效率比优化前提高了2.3%。 本文将数值模拟技术和有限元分析法相结合应用于叶轮结构设计分析,对提高叶轮的安全性与可靠性,缩短设计周期,降低成本具有重要意义。
[Abstract]:With the development of industry and agriculture, the scope of application of pump is expanding. The hydraulic characteristics and operating stability of the pump are required more and more. Centrifugal pump impeller is an important part of centrifugal pump. Its working performance and efficiency directly affect the working performance of centrifugal pump. The impeller is subjected to the combined action of centrifugal force and water pressure in the working state. The traditional design method has large workload and low efficiency. With the application of numerical simulation and finite element analysis in the field of impeller machinery, it provides the basis for structural design and internal flow field analysis. In this paper, the flow field simulation of impeller, the ANSYS static and modal analysis of impeller and the optimization of impeller geometric parameters are studied with a centrifugal pump with medium and high specific rotation. Firstly, the three-dimensional modeling of impeller entity is carried out in UG, the model is meshed, and the pressure, velocity distribution and pressure distribution on the blade of centrifugal pump impeller are obtained by using computational fluid dynamics (CFD) technique. Static and modal analysis are carried out by ANSYS. Finally, the geometric parameters of impeller are optimized by genetic algorithm toolbox. The three-dimensional solid model of impeller is established by the wood model of centrifugal pump, and the surface quality of impeller blade is analyzed by curved surface tool, which makes the shape of impeller more reasonable and accurate, and improves the efficiency of impeller design. The theory and method of numerical simulation of flow in centrifugal pump are introduced. The impeller is meshed and the boundary conditions are set in GAMBIT. The internal flow field of centrifugal pump is solved by FLUENT software, and the pressure and velocity distribution of centrifugal pump is obtained accurately, and the pressure data distributed on the blade are outputted. In view of the less strength and modal analysis of centrifugal pump impeller with water as medium, the pressure data of flow field analysis is loaded into the blade by APDL program language of ANSYS, and the fluid-solid coupling analysis of centrifugal pump is realized. The static analysis and modal analysis of impeller are carried out, and the stress-strain and frequency characteristics of impeller under the action of water pressure and centrifugal force are obtained. The calculation results show that the impeller works reliably under the design condition. Taking the minimum of disk friction loss, hydraulic loss and volume loss of impeller as objective function, the M file of objective function is compiled, the value range of optimization variable is determined, and the inlet of blade is obtained by using genetic algorithm toolbox of Matlab. The outlet angle and outlet width are optimized, and the efficiency of theoretical inverse calculation is increased by 2.33% compared with that before optimization. In this paper, the application of numerical simulation and finite element analysis in impeller structure design and analysis is of great significance in improving the safety and reliability of impeller, shortening the design period and reducing the cost.
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311
本文编号：2271203
[Abstract]:With the development of industry and agriculture, the scope of application of pump is expanding. The hydraulic characteristics and operating stability of the pump are required more and more. Centrifugal pump impeller is an important part of centrifugal pump. Its working performance and efficiency directly affect the working performance of centrifugal pump. The impeller is subjected to the combined action of centrifugal force and water pressure in the working state. The traditional design method has large workload and low efficiency. With the application of numerical simulation and finite element analysis in the field of impeller machinery, it provides the basis for structural design and internal flow field analysis. In this paper, the flow field simulation of impeller, the ANSYS static and modal analysis of impeller and the optimization of impeller geometric parameters are studied with a centrifugal pump with medium and high specific rotation. Firstly, the three-dimensional modeling of impeller entity is carried out in UG, the model is meshed, and the pressure, velocity distribution and pressure distribution on the blade of centrifugal pump impeller are obtained by using computational fluid dynamics (CFD) technique. Static and modal analysis are carried out by ANSYS. Finally, the geometric parameters of impeller are optimized by genetic algorithm toolbox. The three-dimensional solid model of impeller is established by the wood model of centrifugal pump, and the surface quality of impeller blade is analyzed by curved surface tool, which makes the shape of impeller more reasonable and accurate, and improves the efficiency of impeller design. The theory and method of numerical simulation of flow in centrifugal pump are introduced. The impeller is meshed and the boundary conditions are set in GAMBIT. The internal flow field of centrifugal pump is solved by FLUENT software, and the pressure and velocity distribution of centrifugal pump is obtained accurately, and the pressure data distributed on the blade are outputted. In view of the less strength and modal analysis of centrifugal pump impeller with water as medium, the pressure data of flow field analysis is loaded into the blade by APDL program language of ANSYS, and the fluid-solid coupling analysis of centrifugal pump is realized. The static analysis and modal analysis of impeller are carried out, and the stress-strain and frequency characteristics of impeller under the action of water pressure and centrifugal force are obtained. The calculation results show that the impeller works reliably under the design condition. Taking the minimum of disk friction loss, hydraulic loss and volume loss of impeller as objective function, the M file of objective function is compiled, the value range of optimization variable is determined, and the inlet of blade is obtained by using genetic algorithm toolbox of Matlab. The outlet angle and outlet width are optimized, and the efficiency of theoretical inverse calculation is increased by 2.33% compared with that before optimization. In this paper, the application of numerical simulation and finite element analysis in impeller structure design and analysis is of great significance in improving the safety and reliability of impeller, shortening the design period and reducing the cost.
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311
【引证文献】
相关硕士学位论文 前3条
1 怓永泰;三元叶轮的计算机辅助设计及其气动性能分析[D];大连理工大学;2013年
2 王雪岩;坩埚试水平台的设计和分析[D];内蒙古农业大学;2013年
3 千勃兴;离心泵叶轮叶片的有限元分析及优化[D];西北农林科技大学;2013年
，本文编号：2271203
本文链接：https://www.wllwen.com/kejilunwen/jixiegongcheng/2271203.html
