【摘要】：多級離心泵由具有同樣功能的兩個以上的泵集合在一起組成,具有運行安全平穩(wěn)、低噪音、長壽命、安裝維修方便等優(yōu)點。高揚程、高效率是目前多級離心泵的發(fā)展趨勢。葉輪和導葉是重要的過流部件,直接影響著多級離心泵的揚程和效率。本文以D(p)450-60型自平衡多級離心泵為研究對象,基于CFD方法對其內流場進行分析和結構優(yōu)化,以提高多級泵的性能,降低能耗。主要進行的工作如下:(1)根據(jù)多級離心泵的二維結構圖建立了泵三維流道模型,并用非結構網格進行了流道域的網格劃分�；贑FD分析方法,運用Fluent軟件預測了額定工況和非額定工況下該自平衡多級離心泵各部件流道內部的內流場分布和整機的水力性能,發(fā)現(xiàn)了導葉是該泵主要的能量損失部件。根據(jù)離心泵試驗標準,設計并完成了多級離心泵部分性能試驗。通過試驗值與預測值的對比,驗證了該泵模型的正確性和模擬方法的合理性。為后文的流場分析和優(yōu)化設計奠定了基礎。(2)通過對導葉的內流場分析,確定了對本文所研究泵中導葉影響較大的幾何參數(shù)為正導葉進口安放角、反導葉進口安放角、反導葉進口直徑和反導葉軸向寬度。利用泵設計方法,重新計算并確定了這4個幾何參數(shù)的取值范圍,并在每個參數(shù)中分別選取了3組模型作為研究對象。根據(jù)CFD數(shù)值模擬,分析了各結構參數(shù)對泵性能的影響。(3)根據(jù)多級離心泵的流動特性,選取了其中的兩級泵體作為計算域。利用正交試驗法,對影響導葉的4個幾何參數(shù)進行了對比分析,并通過試驗結果確定了各參數(shù)的最優(yōu)值。經模擬顯示優(yōu)化后計算域相比于原計算域揚程增幅為5.78m,泵效率增幅為4.22%。分析了不同葉片數(shù)對葉輪和導葉的影響,并確定了兩級計算域中葉輪和導葉的最佳葉片數(shù)匹配方式。分析發(fā)現(xiàn)優(yōu)化后計算域模型的揚程相比于原計算域揚程增幅為7.92m,效率增幅為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.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH311

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