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系統識別號 U0002-0808202121492000
中文論文名稱 網目再生器之流力數值分析
英文論文名稱 Simulation Study of Fluid Flow in Wire Mesh Regenerator
校院名稱 淡江大學
系所名稱(中) 機械與機電工程學系碩士班
系所名稱(英) Department of Mechanical and Electro-Mechanical Engineering
學年度 109
學期 2
出版年 110
研究生中文姓名 博樊
研究生英文姓名 Kuttum Pavan Kumar
電子信箱 kuthumpavan@gmail.com
學號 608375035
學位類別 碩士
語文別 英文
口試日期 2021-07-15
論文頁數 61頁
口試委員 指導教授-康尚文 博士
委員-陳育堂
委員-蔡孟昌
中文關鍵字 史特靈冷凍機  再生器  雷諾數  摩擦係數  單向流  多孔結構 
英文關鍵字 Stirling Refrigerator  Regenerator  Friction Factor  Reynolds Number  Steady Flow  Porous Structure 
學科別分類 學科別應用科學機械工程
中文摘要 本文介紹了史特靈引擎再生器中壓降與熱傳特性之初步實驗和數值分析研究。
設計史特靈再生器測試平台用於分析評估與比較不同再生器在穩態條件下的壓降特性,同時進行三維 (3-D) 數值模擬以數值表徵在不同孔隙率和流動邊界條件下通過絲網再生器的壓降現象。
在實驗中,以#300目、#400目、#500目三種不銹鋼網目,以及#300/400/500和 #500/400/300的混合網目,製成直徑5 mm與長45 mm之再生器。穩流測試平台由氦氣罐、浮子流量計、兩個壓力傳感器、與一個特別設計的組件組成,其組件主要放置多孔性結構樣品。目的是在單向流實驗中測量再生器流力特性,如摩擦係數(Cf)、雷諾數(Re)、壓降等。
在數值研究中,使用CFD(計算流體力學)中的FVM(有限體積法)對不同配置的金屬網目進行研究。由標準的二參數 Ergun equation分析計算出之壓降和雷諾數關係式,可應用於等效多孔介質再生器之流力設計。
英文摘要 In this study, the pressure drops and friction factor characteristics of the Stirling engine regenerator were experimentally and numerically studied. The Stirling regenerator test bench is designed to analyze and evaluate different wire mesh regenerators' pressure drop characteristics under steady-state flow conditions. At the same time, 3-D numerical simulations are performed to numerically characterize the pressure loss inside the wire mesh regenerator under different porosity and flow boundary conditions.
In the experiment, three stainless steel Meshes of #300 Mesh, #400 Mesh, #500 Mesh and a hybrid mesh of #300/400/500 and #500/400/300 mesh of 5 mm diameter and a length of 45 mm were fabricated. The steady flow test bench comprises a helium gas tank, rotameter, two pressure transducers, and a specially designed module that houses the porous structure sample. The goal is to measure the hydrodynamic properties of the regenerator during the single flow experiment. In addition, pressure drop and friction factor correlation were calculated for the set of regenerator wire mesh.
For different configurations of wire mesh regenerators, the numerical research uses a finite volume method on CFD (computational fluid dynamics) models. The conventional two-parameter Ergun is obtained from the pressure drop and Reynolds number equations, and it may be confidently applied in an identical porous media for future regenerator flow.
論文目次 Acknowledgement iv
List of Figures vii
List of tables ix
Nomenclature x
CHAPTER 1. INTRODUCTION 1
1.1 Working principle of Stirling Regenerator 2
1.2 Literature Study 4
1.3 Aim and Scope of Research 8
CHAPTER 2. THEORY OF STIRLING REGENERATOR 9
2.1 Flow characteristics of the Stirling regenerator 9
CHAPTER 3. EXPERIMENTAL METHODOLOGY 13
3.1 Experimental components 13
3.1.1 regenerator 13
3.1.2 Flowmeter 16
3.1.3 Pressure sensor 17
3.2 Experimental measurement 18
CHAPTER 4. DESIGN AND CFD ANALYSIS 22
4.1 Design of regenerator mesh screens 22
4.2 Computational fluid dynamics 24
4.1.1 Computational domain 25
4.1.2 Meshing 27
4.1.3 Boundary conditions 28
4.1.4 Numerical approach 28
4.1.5 Mesh Independence Study 30
4.3 CFD Results 33
CHAPTER 5. CONCLUSION 41
References 43
Appendix Ⅰ 47
Appendix Ⅱ 52
List of Figures
Figure 1. Stirling engine design by R. Stirling in the 19th century [1]. 2
Figure 2. (a) Pressure–Volume diagram of the Stirling cycle and (b) Temperature vs. Specific entropy diagram of Stirling cycle. 3
Figure 3. Piston motion of Stirling cycle 3
Figure 4. Actual Stirling cycle 4
Figure 5. Shows regenerator mesh screen parameters. 10
Figure 6. Types of Stirling regenerator matrix. (a) Wire mesh regenerator with a uniform porosity (b) Wire mesh regenerator with multiple porosities. 14
Figure 7. SEM analysis of various wire mesh numbers (a) #300, (b) #400 and (c) #500 wire mesh screens. 15
Figure 8. Regenerator mesh screen filler 15
Figure 9. Experimental setup regenerator housing 16
Figure 10. Flowmeter 17
Figure 11. Pressure sensor 17
Figure 12. (a) The experimental setup and (b) Illustration of the experimental setup. 19
Figure 13. Steady flow pressure drops vs velocity 21
Figure 14. Friction coefficient vs Reynolds Number. 21
Figure 15. Comparison of steel wire mesh with mesh design. 23
Figure 16. Design layouts of stacked wire mesh screens (a) Stacked aligned and (b) Stacked misaligned configurations. 23
Figure 17. Typical CFD modelling workflow. 25
Figure 18. 3-D view of computational fluid domain. 26
Figure 19. Meshing of the fluid domain. 27
Figure 20. Comparasion of pressure drop for different designs. 31
Figure 21. Comparison of a velocity profile for different mesh designs. 32
Figure 22. Pressure drops vs velocity for aligned mesh configuration of regenerator. 34
Figure 23. Pressure drops vs Velocity for misaligned mesh configuration of regenerator. 35
Figure 24. Friction coefficient and Reynolds number for aligned mesh configuration. 36
Figure 25. Friction coefficient and Reynolds number for misaligned mesh configuration. 37
Figure 26. Comparison of friction factor vs reynold’s number for aligned and misaligned mesh configuration 40
Figure 27. Comparison of CFD friction factor with the other researchers. 40
List of tables
Table 1. Wire mesh Regenerator parameters. 15
Table 2. Number of mesh screen for different regenerators 26
Table 3. Comparison of Skewness and Orthogonal quality for different design. 31
Table 4. Inlet and Outlet (a) Pressure drop data and (b) Velocity data. 32
Table 5. Correlation equation for aligned wire mesh. 36
Table 6. Correlation equation for misaligned wire mesh. 38
Table 7. Comparison of friction Factor correlation obtained from cited researchers and the present study. 39
Table 8. Summary of steady flow tests for 300 mesh 47
Table 9. Summary of steady flow tests for 400 mesh. 48
Table 10. Summary of steady flow tests for 500 mesh 49
Table 11. Summary of steady flow tests for 300/400/500 mesh 50
Table 12. Summary of steady flow tests for 500/400/300 mesh 51
Table 13. CFD pressure drop contour for aligned mesh and misaligned mesh configuration. 52
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