多级离心泵水力性能分析及优化设计
发布时间：2018-08-16 10:07
【摘要】：多级离心泵由具有同样功能的两个以上的泵集合在一起组成,具有运行安全平稳、低噪音、长寿命、安装维修方便等优点。高扬程、高效率是目前多级离心泵的发展趋势。叶轮和导叶是重要的过流部件,直接影响着多级离心泵的扬程和效率。本文以D(p)450-60型自平衡多级离心泵为研究对象,基于CFD方法对其内流场进行分析和结构优化,以提高多级泵的性能,降低能耗。主要进行的工作如下:(1)根据多级离心泵的二维结构图建立了泵三维流道模型,并用非结构网格进行了流道域的网格划分。基于CFD分析方法,运用Fluent软件预测了额定工况和非额定工况下该自平衡多级离心泵各部件流道内部的内流场分布和整机的水力性能,发现了导叶是该泵主要的能量损失部件。根据离心泵试验标准,设计并完成了多级离心泵部分性能试验。通过试验值与预测值的对比,验证了该泵模型的正确性和模拟方法的合理性。为后文的流场分析和优化设计奠定了基础。(2)通过对导叶的内流场分析,确定了对本文所研究泵中导叶影响较大的几何参数为正导叶进口安放角、反导叶进口安放角、反导叶进口直径和反导叶轴向宽度。利用泵设计方法,重新计算并确定了这4个几何参数的取值范围,并在每个参数中分别选取了3组模型作为研究对象。根据CFD数值模拟,分析了各结构参数对泵性能的影响。(3)根据多级离心泵的流动特性,选取了其中的两级泵体作为计算域。利用正交试验法,对影响导叶的4个几何参数进行了对比分析,并通过试验结果确定了各参数的最优值。经模拟显示优化后计算域相比于原计算域扬程增幅为5.78m,泵效率增幅为4.22%。分析了不同叶片数对叶轮和导叶的影响,并确定了两级计算域中叶轮和导叶的最佳叶片数匹配方式。分析发现优化后计算域模型的扬程相比于原计算域扬程增幅为7.92m,效率增幅为6.01%。
[Abstract]:The multistage centrifugal pump is composed of two or more pumps with the same function, which has the advantages of safe operation, low noise, long life, convenient installation and maintenance, etc. High head and high efficiency are the development trend of multistage centrifugal pump. Impeller and guide vane are important flow components, which directly affect the lift and efficiency of multistage centrifugal pump. In this paper, the internal flow field of D (p) 450-60 self-balanced multistage centrifugal pump is analyzed and optimized based on CFD method in order to improve the performance of multi-stage pump and reduce energy consumption. The main works are as follows: (1) according to the two-dimensional structure diagram of the multistage centrifugal pump, the three-dimensional flow channel model of the pump is established, and the flow channel domain is meshed with the unstructured grid. Based on the CFD analysis method, the internal flow field distribution and hydraulic performance of the various components of the self-balanced multistage centrifugal pump are predicted under rated and non-rated working conditions by using Fluent software, and the guide vane is found to be the main energy loss component of the pump. According to the test standard of centrifugal pump, the partial performance test of multistage centrifugal pump is designed and completed. The correctness of the model and the rationality of the simulation method are verified by comparing the experimental values with the predicted values. It lays a foundation for the flow field analysis and optimization design. (2) through the analysis of the inner flow field of the guide vane, the geometric parameters which have a great influence on the guide vane of the pump studied in this paper are the positive guide vane inlet placement angle and the antimissile vane inlet placement angle. The inlet diameter and axial width of the antimissile vanes. By using pump design method, the range of the four geometric parameters is re-calculated and determined, and three groups of models are selected as the research objects in each parameter. According to CFD numerical simulation, the influence of structural parameters on pump performance is analyzed. (3) according to the flow characteristics of multi-stage centrifugal pump, the two-stage pump body is selected as the calculation field. By using the orthogonal test method, the four geometric parameters affecting the guide vane are compared and analyzed, and the optimum values of each parameter are determined by the test results. The simulation results show that the increase of head and pump efficiency are 5.78 m and 4.22 m respectively. The influence of different blade numbers on impeller and guide vane is analyzed, and the optimum matching method of impeller and guide vane in two-stage calculation domain is determined. It is found that the increase of the head and efficiency of the optimized model is 7.92 m and 6.01 m, respectively, compared with the original one.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH311
本文编号：2185660
[Abstract]:The multistage centrifugal pump is composed of two or more pumps with the same function, which has the advantages of safe operation, low noise, long life, convenient installation and maintenance, etc. High head and high efficiency are the development trend of multistage centrifugal pump. Impeller and guide vane are important flow components, which directly affect the lift and efficiency of multistage centrifugal pump. In this paper, the internal flow field of D (p) 450-60 self-balanced multistage centrifugal pump is analyzed and optimized based on CFD method in order to improve the performance of multi-stage pump and reduce energy consumption. The main works are as follows: (1) according to the two-dimensional structure diagram of the multistage centrifugal pump, the three-dimensional flow channel model of the pump is established, and the flow channel domain is meshed with the unstructured grid. Based on the CFD analysis method, the internal flow field distribution and hydraulic performance of the various components of the self-balanced multistage centrifugal pump are predicted under rated and non-rated working conditions by using Fluent software, and the guide vane is found to be the main energy loss component of the pump. According to the test standard of centrifugal pump, the partial performance test of multistage centrifugal pump is designed and completed. The correctness of the model and the rationality of the simulation method are verified by comparing the experimental values with the predicted values. It lays a foundation for the flow field analysis and optimization design. (2) through the analysis of the inner flow field of the guide vane, the geometric parameters which have a great influence on the guide vane of the pump studied in this paper are the positive guide vane inlet placement angle and the antimissile vane inlet placement angle. The inlet diameter and axial width of the antimissile vanes. By using pump design method, the range of the four geometric parameters is re-calculated and determined, and three groups of models are selected as the research objects in each parameter. According to CFD numerical simulation, the influence of structural parameters on pump performance is analyzed. (3) according to the flow characteristics of multi-stage centrifugal pump, the two-stage pump body is selected as the calculation field. By using the orthogonal test method, the four geometric parameters affecting the guide vane are compared and analyzed, and the optimum values of each parameter are determined by the test results. The simulation results show that the increase of head and pump efficiency are 5.78 m and 4.22 m respectively. The influence of different blade numbers on impeller and guide vane is analyzed, and the optimum matching method of impeller and guide vane in two-stage calculation domain is determined. It is found that the increase of the head and efficiency of the optimized model is 7.92 m and 6.01 m, respectively, compared with the original one.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH311
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