臺灣博碩士論文加值系統

在現今社會中，泵浦(Pump)的應用與我們的生活息息相關，從農業中的灌溉水利設施到工業設備中液體加壓運輸，泵浦皆為工作中的核心設備。當泵浦葉片高速旋轉時，葉片附近的部分流場會因壓力降低而產生空蝕現象，空蝕現象不僅會生振動、噪音以及降低泵浦之效率，同時也會造成葉片的破壞以及降低其使用壽命。本研究探討目的為針對泵浦轉子葉片進行改良設計，以及在不降低泵浦效率之情況下，使葉片周遭空蝕區域下降。
本研究利用Solidworks軟體繪製雙級泵浦模型同時也利用此軟體設計與改良轉子葉片，再利用Ansys Workbench 增設內外流場並設置網格，最後使用計算流體模擬軟體Fluent 20進行流場模擬，分析其流量、速度與壓力分佈。從分析結果得出不論在各種角度下第一級轉子葉片根部壓力會有部分區域低於飽和蒸汽壓，故此區域易產生空蝕現象，而在轉子葉片與轉軸夾角少時，空蝕區域下降；在第二級轉子葉片上由於泵浦內部壓力上升，因此空蝕區域較小。

In recent years, the application of pump is closely related to our life, from irrigation and water conservancy facilities in agriculture to liquid pressurization and transportation in industrial equipment, pump is the core machine in the work. When the pump impeller rotates at high speed, cavitation will occur in the flow field near the impeller due to the lower pressure, which will not only generate vibration, noise and reduce the pump efficiency, but also cause damage to the impeller and reduce its service life. The purpose of this study is to improve the design of the pump rotor blade in order to reduce the cavitation area around the blade without reducing the pump efficiency.
This study uses Solidworks software to draw a model of a two-stage pump as well as this software to design and modify the rotor blades. Ansys Workbench was then used to create the internal and external flow fields as well as to set up the mesh. Finally, computational fluid dynamics simulation software Fluent 20 was used to simulate the flow field and analyze the flow, velocity and pressure distribution. From the analysis results, it is concluded that the pressure at the root of the first stage rotor blade is partly below the saturated steam pressure under various models, so the area is susceptible to cavitation, while the cavitation area decreases when the angle between the rotor and the shaft is lower; the cavitation area is smaller in the second stage rotor blade due to the increase in the internal pressure of the pump.

摘要...i
Abstract...ii
誌謝...iv
目錄...v
表目錄...viii
圖目錄...ix
符號說明...xiv
1 第一章 緒論...1
1.1 前言...1
1.2 研究動機...1
1.3 研究目的...2
2 第二章 文獻回顧...3
2.1 泵浦模型設計...3
2.2 數值模擬方法研究紊流模組...5
2.3 空蝕現象...6
3 第三章 研究內容與方法...8
3.1 泵浦類型介紹...8
3.2 泵浦模型...10
3.3 網格設定...16
3.4 邊界條件設定...18
4 第四章 數學模式與數值方法...21
4.1 數學公式...21
4.1.1 統御方程式與假設...21
4.1.2 壓力與流量方程式...22
4.1.3 k-ε紊流方程式...23
4.1.4 SIMPLE C算法公式...24
4.2 數值方法...25
5 第五章 結果與討論...27
5.1 繪製模型...27
5.2 網格建立...27
5.3 設置流場狀態與邊界條件...28
5.4 初始模型之數值分析...28
5.4.1 流量與速度分析...29
5.4.2 壓力分析...29
5.4.3 紊流動能與紊流消散率分析...29
5.4.4 空蝕區域分析...30
5.5 葉片角度增加模型之數值分析...30
5.5.1 流量與速度分析...30
5.5.2 壓力分析...31
5.5.3 紊流動能與紊流消散率分析...32
5.5.4空蝕區域分析...32
5.6 葉片角度減少模型之數值分析...33
5.6.1 流量與速度分析...33
5.6.2 壓力分析...34
5.6.3 紊流動能與紊流消散率分析...35
5.6.4 空蝕區域分析...35
5.7 初始模型與角度變化模型分析結果比較...35
5.7.1 流量與速度分析...36
5.7.2 壓力分析...37
5.7.3 紊流動能與紊流消散率分析...37
5.7.4 空蝕區域分析...38
第六章 結論...39
參考文獻...112
Extended Abstract...115

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