臺灣博碩士論文加值系統

這篇文章呈現在一台離心式泵浦裡面的一個三維流動數值模擬。 計算該泵
浦有一台寬153毫米出口葉輪直徑的一台商業的離心水泵浦， 後曲的彎曲葉片，額
定流量為65公升/分鐘和36米高的壓頭。

這模擬由一個不穩定的計算做出並且使用滑動的網格技術並考慮到葉輪與渦殼相互作用。 由於他們，在舌端前方可正確地模擬葉片通路，流動由壓力波動引起。 數值結果與模擬特性曲線相比較，壓力波動在渦形殼裡測量。

獲得的數據為在泵浦內主要現象的分析， 如壓力改變在不同的渦形流動速率； 主要在不同流動條件葉片發生； 由於渦形寬度改變在葉輪和渦形之間而產生二次流擾動。

This paper shows a numerical simulation of the three dimensional fluid flow inside a centrifugal pump. The pump is a commercial centrifugal water pump with a 153 mm outlet impeller diameter, backward curved blades, nominal flow of 65 /min and 36 m of head.

This simulation has been made with an unsteady calculation and using the sliding meshes technique to take into account the impeller-volute interaction. With them, it is possible to simulate correctly the blade passage in front of the tongue and the flow and pressure fluctuations induced. Numerical results are compared with the experimental characteristic curve and pressure fluctuations measured in the volute.

The data obtained allow the analysis of the main phenomena existent in these pumps, such as: pressure changes in the volute for different flow rates; the incidence at the leading edge of the blade with different flow conditions; and the secondary flow generated in the volute due to the width change between the impeller and the volute.

誌謝

摘要

Abstract

目錄..........................................i

表錄........................................ v

圖錄..........................................vi

符號說明.....................................X

一、緒論......................................1

1.1 研究動機..................................1

1.2 文獻回顧...................................2

二、研究方法...................................6

2.1模型圖......................................6

2.2 模型描述和計算方法,泵浦,幾何學和細格欄.......8

2.3 數值模型 ....................................9

2.4 邊界條件...................................10

2.5 數值控制計算...............................10

2.6 後處理 ...................................11

三、數值分析.................................. 12

3.1 數值方法..................................12

3.2. Governing Equation 統御方程式............13

3.3 離散C.V.(控制體積)法.....................15

3.4 有限體積法.............................17

3.5 滑動網格(Sliding Mesh)方法..............20

四、結果與討論................................23

4.1 離心式泵出口區域和入口區域壓力曲線圖......23

4.1.1 0.5-1.5Kg出口壓力比較值...............29

4.1.2 0.5-1.5Kg入口壓力比較值...............29

4.2. 出口區壓力分佈表.........................30

4.2.1 模擬1秒-8秒間壓力值...................30

4.2.2 模擬9秒-16秒間壓力值.....................30

4.2.3 模擬17秒-23秒間壓力值...................31

4.3 入口區壓力分佈表.........................31

4.3.1 模擬1秒-8秒間壓力值....................31

4.3.2 模擬9秒-16秒間壓力值...................32

4.3.3 模擬17秒-23秒間壓力值..................32

4. 4 以 0.5 1.0 1.5 三 種 壓 力 分 別 在 5秒 10秒 15秒和 20秒 間
測試分析比較速度向量圖和壓力分佈圖.............33

第五章、結論與未來展望........................46

5.1 結論......................................46

5.2 未來展望.................................46

參考文獻.....................................47

作者簡介................................49

1.離心式泵 作者:蘇宗寶 出版社:徐氏基金會 出版年月:民國78年
2.泵浦與水輪機 作者:徐景褔 出版社:正言 出版年月:民國77年
3.REFERENCES(參考)
Adkins, D.R. and Brennen, C.E., 1988, “Analysis of Hydrodynamic
Radial Forces on Centrifugal Pump Impellers”, ASME Journal of
Fluids Engineering, Vol. 110, pp.20-28.
4.Dong, R., Chu, S. and Katz, J., 1997, “Effect of Modification to
Tongue and Impeller Geometry on Unsteady Flow, Pressure
Fluctuations and Noise in a Centrifugal Pump”, ASME Journal of
Turbomachinery, Vol. 119, pp. 506-515.
5.Denus, C.K. and Göde, E., 1999 “A Study in Design and CFD Analysis
of a Mixed-Flow Pump Impeller”, ASMEFEDSM 99-6858.
6.Croba, D. and Kueny, J.L., 1996, “Numerical Calculation of 2D,
Unsteady Flow in Centrifugal Pumps: Impeller and Volute
Interaction”, International Journal for Numerical Methods in
Fluids, Vol. 22, pp. 467-481.
7.http://www.cfd.pme.nthu.edu.tw/CFD.htm
8.泵浦 作者:許柏 出版社:正言 出版年月:民國55年
9.ACKNOWLEDGMENTS(承認)
The authors gratefully acknowledge the financial support of the 良
營 Design & Develop Company under the Project 華機93專案字 02 號.
10.Fernández, J. and Santolaria, C., 1993, “Esfuerzosde origen
fluidodinamico en una bomba centrífuga con rodete recortado”,
Actas del I Congreso Iberoamericano de Ingeniería Mecánica,
Madrid, Spain, Vol. 2, pp. 187-193.
11.Longatte, F. and Kueny, J.L., 1999, “Analysis of Rotor-Stator-
Circuit Interactions in a Centrifugal Pump”, ASMEFEDSM- 99-6866.
12.http://www.mrl.itri.org.tw/yflow/pub/cfd-98.htm
13.http://www.91tech.net/Article/MathsBase/200509/2374.html
14.http://www.mrl.itri.org.tw/yflow/chinese.htm
15.http://www.mrl.itri.org.tw/yflow/ger_c.htm
16.http://www.mrl.itri.org.tw/yflow/sli_c.htm