發(fā)布時間：2018-08-31 17:22

【摘要】：多級離心泵是廣泛應用于石油化工、水循環(huán)與處理、油氣儲運、能源發(fā)電以及建筑工程等各行各業(yè)的通用流體機械設備，而級間導葉作為其中一種重要的過流部件對多級泵性能有著直接的影響。因此本文著重開展依托于多級泵模型而針對于導葉的研究工作，最終得到多級泵級間導葉內流場的分布狀況以及實現(xiàn)徑向導葉參數的優(yōu)化設計，為實現(xiàn)多級泵性能的改善并為降低能耗提供幫助。 為了輔助本課題的研究工作，，借助了合作方佛山水泵廠提供的KDW65型多級泵模型以及相關的實驗測試平臺，其中的泵模型為帶有徑向導葉且為四級三出口的節(jié)段式多級離心泵。本文中主要采用了CFD數值模擬、MATLAB優(yōu)化計算以及性能試驗等的研究方法來實現(xiàn)論文的研究工作。 首先，利用三維軟件Pro/E實現(xiàn)了KDW65型多級泵的水體計算域的建模與裝配，然后分別借助于ICEM與CFX軟件最終實現(xiàn)了網格劃分與整機的數值模擬計算，分析得到了多級泵導葉流道內關于壓力、速度矢量以及流線等內流場的分布規(guī)律。并借助于測試平臺完成了該模型泵在不同流量工況下的性能試驗，通過數值模擬與性能試驗得到的特性曲線的匹配程度來驗證了基于CFD計算方法的準確性。其次，本課題建立了兩種導葉結構模型，分別是徑向導葉與流道式導葉，然后選擇了兩種過流介質，常溫清水和粘性油品。探究了在不同的流量工況，不同的過流介質以及不同的導葉結構下的離心泵外特性表現(xiàn)。另外，徑向導葉相關設計參數優(yōu)化的實現(xiàn)主要借助于基于CFD的單變量篩選法以及基于MATLAB的遺傳算法優(yōu)化設計法兩種方法。方法一建立了十幾組不同的導葉參數模型來對泵的性能進行比較，以此實現(xiàn)導葉參數的篩選；方法二通過找到葉輪與導葉的匹配關系來建立起包含導葉參數的目標函數，然后借助于MATLAB遺傳算法工具箱實現(xiàn)參數優(yōu)化設計。優(yōu)化設計的實現(xiàn)，一方面可以實現(xiàn)包括基圓直徑、喉部尺寸、葉片數等重要參數在內的眾多參數的優(yōu)化篩選，另外一方面可以得到徑向導葉各設計參數對泵性能的影響規(guī)律。
[Abstract]:Multi-stage centrifugal pump is widely used in petrochemical industry, water cycle and treatment, oil and gas storage and transportation, energy generation and construction engineering and other industries of general fluid machinery equipment, and the guide vane as one of the important flow components has a direct impact on the performance of multi-stage pump. In order to improve the performance of the multi-stage pump and reduce energy consumption, the flow field distribution in the guide vane of the multi-stage pump and the optimization design of the radial guide vane parameters are obtained.
In order to assist the research work of this subject, the KDW65 multi-stage pump model provided by Foshan Water Pump Factory and the related experimental test platform are used. The pump model is a segmental multi-stage centrifugal pump with radial guide vane and four stages and three outlets. The method of research is to realize the research work of this paper.
Firstly, the modeling and assembly of KDW65 multi-stage pump's water body calculation domain are realized by using three-dimensional software Pro/E. Then, the grid division and numerical simulation of the whole pump are realized by using ICEM and CFX software respectively. The distributions of pressure, velocity vector and streamline in the guide vane passage of the multi-stage pump are analyzed and obtained. It is helpful for the test platform to complete the performance test of the model pump under different flow conditions. The accuracy of CFD calculation method is verified by the matching degree between numerical simulation and performance test. Secondly, two kinds of guide vane structure models are established, which are radial guide vane and runner guide vane, and then selected. Two kinds of flow media, normal temperature water and viscous oils, were used to study the performance of centrifugal pumps under different flow conditions, different flow media and different guide vane structures. Methods One is to establish more than ten sets of different vane parameter models to compare the performance of the pump, so as to realize the selection of vane parameters; the other is to establish the objective function containing vane parameters by finding the matching relationship between the impeller and vane, and then optimize the parameters with the help of MATLAB genetic algorithm toolbox. Design. The realization of the optimal design, on the one hand, can realize the optimization of many parameters including basic circle diameter, throat size, blade number and other important parameters, on the other hand, can get the design parameters of the radial guide vane on the pump performance.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH311

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