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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/49316完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊馥菱(Fu-Ling Yang) | |
| dc.contributor.author | Che-Wei Yeh | en |
| dc.contributor.author | 葉哲維 | zh_TW |
| dc.date.accessioned | 2021-06-15T11:23:23Z | - |
| dc.date.available | 2021-08-26 | |
| dc.date.copyright | 2016-08-26 | |
| dc.date.issued | 2016 | |
| dc.date.submitted | 2016-08-17 | |
| dc.identifier.citation | [1] AMCA Standard 210-99 Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/49316 | - |
| dc.description.abstract | 全密閉式風扇冷卻馬達廣泛應用於工業界，為了達成提高馬達致冷效果以及符合國家工廠噪音管制標準之目的，風扇冷卻系統氣動和聲學特性研究成為重要的研究課題。本研究主要使用計算流體力學軟體ANSYS Fluent內建之多重參考座標系統和滑移網格進行旋轉流場模擬。我們首先建立一數值風洞模型，針對Multi-Wing軸流式風扇採用傳統方法和下游流阻法兩種邊界條件進行風扇性能曲線的量測驗證。模擬結果和實驗數據相比，傳統方法最大誤差可達65.8%，而下游流阻法的結果較為精準，最大誤差僅8.72%。接著使用多重參考座標系統的擬穩態結果作為初始解代入滑移網格計算，誤差也皆小於5%，驗證了本研究之數值風洞是可行的。研究的後半段採用數值風洞計算包含安全網目、風扇、風罩和擋板的全密閉式風扇冷卻系統之系統性能曲線和聲場，安全網目以多孔隙材料簡化。我們嘗試四種幾何策略改善原始系統的性能，研究結果顯示幾何策略可大幅提升系統流量，但是由於後方斜流道和流體的交互作用產生多餘的聲源，和原始系統相比亦會造成少量噪音的產生。
關鍵字：全密閉式風扇冷卻馬達、多重座標參考系統、滑移網格、風扇性能曲線、流道設計、下游流阻法 | zh_TW |
| dc.description.abstract | Totally-Enclosed-Fan-Cooled (TEFC) motor is extensively utilized in modern industry. To reach the purposes of improving the motor cooling effect and according with the factory noise control standard, the research of aerodynamic and acoustic characteristics of the fan cooling system become important issues. In this study, we mainly use the computational fluid dynamics software, ANSYS Fluent and its build-in rotating model, Multiple Reference Frame (MRF) and sliding mesh (SM) models to simulate the swirling flow. We first construct a numerical wind tunnel which is conducted by two boundary conditions, the conventional method and the Downstream Flow Resistance (DFR) method, calculate the flow field of the Multi-Wing axial fan and verify the fan performance measurement. In comparison to the experimental data, the maximum error of the conventional method result is up to 65.8% and the DFR method result becomes more accurate and its maximum error is reduced to 8.72%. We then compute the transient result which begins from the quasi-steady initial solution by the sliding mesh model, and the errors are all less than 5%. These results verify that the numerical wind tunnel is feasible. In the last half of this research, we apply the previous numerical wind tunnel to compute the system performance curve and the acoustic field of the fan cooling system including the safety mesh, fan, shroud, and plate. The safety mesh is simplified by the porous zone. We try four strategies to modify the geometry of the system on the purposes of improving the volume flow rate and reducing the noise of the original system. The results show that the modified system has the ability to improve the system volume flow rate obviously, but the system noise also increases a little due to the interaction between the deflected pathway and the fluid in comparison to the original system.
Keywords: Totally-Enclosed-Fan-Cooled motor, Multiple Reference Frame, Sliding mesh, Fan performance curve, Downstream flow resistance method | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T11:23:23Z (GMT). No. of bitstreams: 1 ntu-105-R03522105-1.pdf: 5352929 bytes, checksum: 3b37a3b3110e9aadff8fea818e5f83ea (MD5) Previous issue date: 2016 | en |
| dc.description.tableofcontents | 中文摘要 III
ABSTRACT IV LISTS OF FIGURES VIII LIST OF TABLES XI Chapter1 Introduction 1 1.1 Objectives 1 1.2 Background 3 1.2.1 Fan Performance Curve 3 1.2.2 Lighthill’s Acoustic Analogy 6 1.2.3 Ffowcs Williams and Hawkings Model (FW-H Model) 9 1.2.4 Broadband Noise Source Model (BNS Model) 16 1.2.5 Sound 17 1.3 Literature Survey 22 1.3.1 Fan Performance Curve 22 1.3.2 Aerodynamic Noise 24 1.4 Outline 26 Chapter2 Numerical Scheme and Setup 27 2.1 Governing Equations 27 2.2 Turbulence Model 28 2.2.1 Turbulence model I: Renormalization Group k-ε (RNG) 29 2.2.2 Turbulence model II: Large Eddy Simulation (LES) 31 2.3 Rotating Model 33 2.3.1 Multiple Reference Frame Model (MRF) 34 2.3.2 Sliding Mesh Model (SMM) 35 2.4 Setup 36 2.4.1 Numerical Scheme and Discretization 36 2.4.2 Rotating Model Strategy 38 2.4.3 Porous Zone 38 Chapter3 Fan Performance Analysis 40 3.1 Numerical Model 40 3.1.1 Multi-Wing Fan 40 3.1.2 Computational Zone, Strategy and Mesh 43 3.1.3 Boundary Condition 45 3.1.4 Mesh Independence Analysis 46 3.2 Fan Performance Curve 47 3.3 Discussions 50 Chapter4 Performance and Acoustic Analysis of Fan System 53 4.1 Numerical Model 53 4.1.1 Fan System 53 4.1.2 Computational Zone, Boundary Condition, and Mesh 56 4.1.3 Parallel Computing 58 4.1.4 Mesh Independence Analysis 60 4.2 Implement of Safety Meshes 61 4.2.1 Resistance curve as a porous segment 61 4.2.2 Fan System Performance Curve 64 4.3 Flow Field Analysis the Fan System 65 4.4 Acoustic Analysis of the Fan System 72 4.4.1 Surface sound power by the Broadband Noise Model 72 4.4.2 Flow transiting from MRF to Sliding Mesh Model 74 4.4.3 Transient Acoustic Results of FW-H Model 77 4.5 Improved Design of Modified Fan System 85 4.5.1 The Principles of Designing the System 85 4.5.2 System Performance Curve 90 4.5.3 Flow Field Analysis of the Modified System 94 4.5.4 Quasi-steady Acoustic Results of Broadband Noise Model 99 4.5.5 Transient Acoustic Results of FW-H Model 104 Chapter5 Conclusions 108 References 110 | |
| dc.language.iso | en | |
| dc.subject | 多重座標參考系統 | zh_TW |
| dc.subject | 下游流阻法 | zh_TW |
| dc.subject | 全密閉式風扇冷卻馬達 | zh_TW |
| dc.subject | 流道設計 | zh_TW |
| dc.subject | 風扇性能曲線 | zh_TW |
| dc.subject | 滑移網格 | zh_TW |
| dc.subject | Totally-Enclosed-Fan-Cooled motor | en |
| dc.subject | Downstream flow resistance method | en |
| dc.subject | Fan performance curve | en |
| dc.subject | Sliding mesh | en |
| dc.subject | Multiple Reference Frame | en |
| dc.title | 針對軸流風扇系統其性能曲線與聲學特性之數值模擬研究 | zh_TW |
| dc.title | Numerical Investigation of Performance Curve and Aeroacoustic Characteristics of an Axial Fan System | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 104-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 黃美嬌(Mei-Jiau Huang),伍次寅(Tzu-Yin Wu) | |
| dc.subject.keyword | 全密閉式風扇冷卻馬達,多重座標參考系統,滑移網格,風扇性能曲線,流道設計,下游流阻法, | zh_TW |
| dc.subject.keyword | Totally-Enclosed-Fan-Cooled motor,Multiple Reference Frame,Sliding mesh,Fan performance curve,Downstream flow resistance method, | en |
| dc.relation.page | 113 | |
| dc.identifier.doi | 10.6342/NTU201603120 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2016-08-18 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
| 顯示於系所單位： | 機械工程學系 | |
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