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研究生：	蔡正杰 Tsai, Cheng-Chieh
論文名稱：	仿生過濾器之最佳化設計 Optimal Design of Biomimetic Filters
指導教授：	胡潛濱 Hwu, Chyan-Bin
學位類別：	碩士 Master
系所名稱：	工學院 - 航空太空工程學系 Department of Aeronautics & Astronautics
論文出版年：	2024
畢業學年度：	112
語文別：	英文
論文頁數：	77
中文關鍵詞：	仿生科技、過濾器設計、計算流體力學、離散相模型、最佳化設計
外文關鍵詞：	biomimetic technology, filter design, Computational fluid dynamics (CFD), Discrete phase modeling (DPM), optimization
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在鬼蝠魟鰓葉結構中發現一種有別於傳統過濾方法的新型過濾機制，通過使用其翼剖面外型的鰓葉，在過濾過程中將浮游生物反彈開並在鰓葉間距產生小型渦流來達到分離顆粒的效果。這種過濾機制被稱為彈跳分離法(Ricochet separation)。本研究通過設計一種具備此過濾機制的航空燃油過濾器，將這種獨特的固液分離方法轉化為實際應用。使用計算流體力學(Computational fluid dynamics)和離散相模型(Discrete phase model)，研究四個葉片幾何設計變數對過濾器壓力損失與蒐集效率的影響，包含: 葉片最大曲率、攻角、葉片排列的長度和葉片數量。利用響應曲面方法來探討這四個設計變數與過濾器性能的關係，並根據這四個設計變數近似計算出不同流量條件下的過濾器性能曲線。最佳化方法採用基因演算法(Genetic Algorithm)在擬合的響應曲面上，以蒐集效率為限制條件，最小化壓力損失為目標。搜尋能夠在不同的流量需求下保持蒐集效率並實現最小壓力損失的最佳的過濾葉片組合，從而得到一款具有低壓力損失、不易堵塞和能夠蒐集比孔隙直徑更小的顆粒等優勢的初篩級過濾器，適用於有高流量需求的過濾系統。

A new filtration mechanism found in the gill structure of manta rays distinguishes itself from conventional filtration methods as manta rays employ their wing-shaped lobes to deflect plankton away and create small vortices between the gill slits during the filtration process. This mechanism is termed “Ricochet separation”. By designing an air vehicle fuel filter featuring this filtration mechanism, in this study we turn this unique solid-liquid separation method into a practical application. Computational fluid dynamics and Discrete phase model were employed to investigate the impact of four geometric design variables on filter performance: maximum camber, angle of attack, length of filter lobe arrangement, number of filter lobe. Utilizing response surface methodology, we explored the relationship between these four design variables and filter performance, approximating the filter performance curve under various flow rate conditions. The optimization process used a Genetic Algorithm on the fitted response surface to minimize pressure drop while maintaining collection efficiency, aiming to find the optimal combination of filter lobe geometry that can accommodate different flow rate requirement, resulting in a preliminary filter with advantages such as low pressure drop, non-clogging, and the capability to collect particles smaller than pore size. Suitable for filtration systems with high flow rates demands.

摘要 i
Abstract ii
Acknowledgements iii
CONTENTS v
LIST OF TABLES vii
LIST OF FIGURES viii
Nomenclature xi
Chapter 1 Introduction 1
1.1 Literature Review 1
1.2 Research Motivation and Objectives 4
1.3 Structure of Thesis 5
Chapter 2 Geometry design 6
2.1 Geometry models 6
2.1.1 Filter model-1st stage 8
2.1.2 Filter model-2nd stage 9
2.1.3 Filter model-3rd stage 11
2.2 Concept of Geometry Design and Biomimetic filter prototype 13
2.3 Filter lobes geometric variables 15
Chapter 3 Computational framework and Simulation result 18
3.1 CFD & DPM 18
3.2 Boundary Condition & Output parameters 19
3.2.1 Boundary Condition 19
3.2.2 Output Parameter 21
3.3 Literature Validation 23
3.3.1 Geometry and Boundary condition 23
3.3.2 Mesh Setting 25
3.3.3 Results and Discussion 26
3.4 Mesh Independent Test 28
3.5 Wing vs. Spoiler configuration 30
Chapter 4 Optimization of Biomimetic Filter 38
4.1 Optimization Formulation 38
4.2 Response Surface Methodology 40
4.2.1 Design of Experiment 40
4.2.2 Response Surface 41
4.2.3 Optimization 43
4.3 Results & Discussion 46
4.3.1 DP1 vs. DP2 vs. DP3 46
4.3.2 Biomimetic filter vs. Conventional filter 51
Chapter 5 Conclusion & Future work Suggestion 56
Appendix 58
Particle motion Equations[16] 58
References 61
                                    

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