高扬程农用灌溉离心泵优化设计
发布时间：2019-04-11 13:51
【摘要】：我国南方丘陵山区因特殊的地理位置,抗旱排灌农用泵多为扬程高、重量轻、体积小、结构简单的低比转速离心泵,这类离心泵普遍存在三大问题：效率低、扬程曲线易出现驼峰、运行易过载。特别是易过载问题对用户构成了很大的安全隐患。 为深入了解低比转速离心泵易过载的问题,本文选择了一组具有代表性的参数作为设计实例,比较系统地按理论分析、水力设计和数值模拟等三方面进行了研究分析,对离心泵过流部件主要结构参数进行了优化,并在数值模拟的基础上对其进行了性能预测。主要包括以下内容： (1)介绍了离心泵现有水力设计方法以及其优缺点,总结了过流部件结构参数选择的一般原则；对低比转速离心泵高扬程、高效率、无驼峰、无过载性能进行了研究探讨,认为实现以上性能统一是存在可能的；分析了过流部件几何参数对离心泵特性曲线的影响,解决过载、驼峰问题可采取减小β2、b2、Z、F,和增大D2等措施。 (2)采用无过载设计法对离心泵过流部件进行了无过载性能设计,得到了过流部件主要结构参数和其水力图；利用参数化的UG软件对叶轮和蜗壳进行了三维建模,并将三维实体模型导入GAMBIT中进行网格划分,再将划分好的网格数据文件导入FLUENT中进行数值计算,获取离心泵内部流动信息。 (3)简述了离心泵内流体运动的控制方程、湍流模型以及边界条件等有关理论；比较分析了三种离心泵性能预测方法；对离心泵叶轮与蜗壳祸合进行了全三维流场的数值计算,获得了泵内部流体运动的压力分布图和速度分布图等信息,为优化离心泵过流部件提供了参考依据,指明了结构改进方向。 (4)数值模拟得到的离心泵内部流态与其实际运行的理论分析结果趋势基本一致,表明本文的无过载设计是合理的,对有关设计研究工作具有一定的参考价值和意义。 (5)最后,本文指出了研究中存在的不足之处,并对今后的研究工作提出了研究方向。
[Abstract]:Because of the special geographical position in the hilly and mountainous areas of southern China, the agricultural pumps for drought-resistant drainage and irrigation are mostly low specific speed centrifugal pumps with high lift, light weight, small volume and simple structure. There are three major problems in this kind of centrifugal pumps: low efficiency, low efficiency. Lift curve is easy to appear hump, easy to overload. In particular, the problem of easy overloading constitutes a great security hazard for users. In order to understand the overloading problem of centrifugal pump with low specific speed, this paper chooses a group of representative parameters as a design example, and makes a systematic research and analysis according to the theoretical analysis, hydraulic design and numerical simulation. The main structural parameters of centrifugal pump flow-through components are optimized and their performance is predicted on the basis of numerical simulation. The main contents are as follows: (1) the existing hydraulic design methods of centrifugal pumps and their advantages and disadvantages are introduced, and the general principles for selecting the structural parameters of flow-through components are summarized. The high lift, high efficiency, no hump and no overload performance of centrifugal pump with low specific speed are studied and discussed. It is considered that it is possible to realize the unity of above performance. The influence of the geometric parameters of the overflow component on the characteristic curve of centrifugal pump is analyzed. The overloading and hump problem can be solved by reducing 尾 _ 2, b _ 2, Z, F, and increasing D _ 2, etc. (2) the non-overload design method is used to design the over-flow component of centrifugal pump without overload, and the main structural parameters and hydrograph of the over-flow component are obtained. The three-dimensional modeling of impeller and volute was carried out by using parameterized UG software, and the three-dimensional solid model was imported into GAMBIT for mesh generation. Then the partitioned grid data file was imported into FLUENT for numerical calculation, and the internal flow information of centrifugal pump was obtained. (3) the governing equation, turbulence model and boundary condition of fluid movement in centrifugal pump are introduced, and three kinds of prediction methods of centrifugal pump performance are compared and analyzed. The numerical calculation of the whole three-dimensional flow field of centrifugal pump impeller and volute is carried out, and the pressure distribution diagram and velocity distribution diagram of the fluid movement inside the pump are obtained, which provides a reference for optimizing the flow-through parts of centrifugal pump. The direction of structural improvement is pointed out. (4) the internal flow pattern of centrifugal pump obtained by numerical simulation is basically consistent with the theoretical analysis results of its actual operation, which shows that the non-overload design in this paper is reasonable and has certain reference value and significance for the relevant design and research work. (5) at last, this paper points out the deficiency of the research, and puts forward the research direction of the future research.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311
本文编号：2456458
[Abstract]:Because of the special geographical position in the hilly and mountainous areas of southern China, the agricultural pumps for drought-resistant drainage and irrigation are mostly low specific speed centrifugal pumps with high lift, light weight, small volume and simple structure. There are three major problems in this kind of centrifugal pumps: low efficiency, low efficiency. Lift curve is easy to appear hump, easy to overload. In particular, the problem of easy overloading constitutes a great security hazard for users. In order to understand the overloading problem of centrifugal pump with low specific speed, this paper chooses a group of representative parameters as a design example, and makes a systematic research and analysis according to the theoretical analysis, hydraulic design and numerical simulation. The main structural parameters of centrifugal pump flow-through components are optimized and their performance is predicted on the basis of numerical simulation. The main contents are as follows: (1) the existing hydraulic design methods of centrifugal pumps and their advantages and disadvantages are introduced, and the general principles for selecting the structural parameters of flow-through components are summarized. The high lift, high efficiency, no hump and no overload performance of centrifugal pump with low specific speed are studied and discussed. It is considered that it is possible to realize the unity of above performance. The influence of the geometric parameters of the overflow component on the characteristic curve of centrifugal pump is analyzed. The overloading and hump problem can be solved by reducing 尾 _ 2, b _ 2, Z, F, and increasing D _ 2, etc. (2) the non-overload design method is used to design the over-flow component of centrifugal pump without overload, and the main structural parameters and hydrograph of the over-flow component are obtained. The three-dimensional modeling of impeller and volute was carried out by using parameterized UG software, and the three-dimensional solid model was imported into GAMBIT for mesh generation. Then the partitioned grid data file was imported into FLUENT for numerical calculation, and the internal flow information of centrifugal pump was obtained. (3) the governing equation, turbulence model and boundary condition of fluid movement in centrifugal pump are introduced, and three kinds of prediction methods of centrifugal pump performance are compared and analyzed. The numerical calculation of the whole three-dimensional flow field of centrifugal pump impeller and volute is carried out, and the pressure distribution diagram and velocity distribution diagram of the fluid movement inside the pump are obtained, which provides a reference for optimizing the flow-through parts of centrifugal pump. The direction of structural improvement is pointed out. (4) the internal flow pattern of centrifugal pump obtained by numerical simulation is basically consistent with the theoretical analysis results of its actual operation, which shows that the non-overload design in this paper is reasonable and has certain reference value and significance for the relevant design and research work. (5) at last, this paper points out the deficiency of the research, and puts forward the research direction of the future research.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311
【引证文献】
相关硕士学位论文 前1条
1 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：2456458
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