請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/81021完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張建成(Chien-Cheng Chang),朱錦洲(Chin-Chou Chu) | |
| dc.contributor.author | Yuan-Shuo Chang | en |
| dc.contributor.author | 張元碩 | zh_TW |
| dc.date.accessioned | 2022-11-24T03:26:32Z | - |
| dc.date.available | 2021-09-11 | |
| dc.date.available | 2022-11-24T03:26:32Z | - |
| dc.date.copyright | 2021-09-11 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-09-01 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/81021 | - |
| dc.description.abstract | " 本研究在探討有限長度圓柱繞流的Magnus效應，運用長寬比 (AR)為2到10、轉速比(α)為0到7，在各雷諾數(Re)從10到1000之間，分析圓柱所受到的升力、阻力以及流線分布，整理出之間的趨勢關聯性，並以物理現象去描述解釋。 本研究使用一般商業軟體Ansys Fluent CFD，模擬設想是以甘油為低Re工作流體，圓柱採用雙邊自由端(兩側皆無固定端)。 選擇在雷諾數10到1000的層流，其中低雷諾數在三維流場中，流經圓柱的流體分離可以分為橫向流場分離(transverse flow separation, TFS)與縱向流場分離(longitudinal flow separation, LFS)，前此研究，發現圓柱在靜止不旋轉時: (a)在雷諾數介於50到120之間之定常流在圓柱中間橫截面的流線會有一類源點(source-like point)，是因為不同AR會造成兩側流場的分歧匯集能力變動、TFS和LFS相互抗衡，原本封閉渦旋被拉扯而改變路線，形成流線從源點散開的景象；且升力係數會隨著Re增加而單調上升，而阻力係數亦然。 (b)低雷諾數下當圓柱轉速增加時，流體因受環流渦度而改變流線，先前的類源點逐漸消失，取而代之的是渦旋，並有數個鞍點的出現。(i)阻力係數CD在低轉速比時是低AR的短圓柱較大，接著會出現交錯反轉情形。(ii)而升力係數CL在圓柱低速旋轉時，所有長寬比AR的圓柱有接近的值，並隨轉速線性上升。然而隨AR遞增依序會到達一穩定值後停止上升。從升力阻力比(CL/CD)的結果可以發現在高轉速長圓柱有最佳值，且必須在轉速比介於1到2之間，可以說產生升力的效果最好。超過該轉速區間後升阻比即開始下降。 " | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-24T03:26:32Z (GMT). No. of bitstreams: 1 U0001-3008202117083800.pdf: 11196050 bytes, checksum: 052af00351cd68425946019d52570bb6 (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | "致謝 i 摘要 iii Abstract iv 目錄 vi 圖目錄 viii 表目錄 xi 第一章 緒論 1 1.1 前言 1 1.2範圍 2 1.3文獻 8 1.3.1圓柱流場 8 1.3.2旋轉圓柱 12 1.3.3其他馬格努斯效應 18 第二章 原理 21 2.1連續方程式 21 2.2動量方程式 22 第三章 方法與架設條件 25 3.1 基本參數 25 3.2 測試區條件 26 3.3 數值方法 27 3.3.1網格大小 27 3.3.2網格設定 28 3.3.3時間步長 31 3.3.4數值 31 第四章 結果 40 4.1三維效應 40 4.2旋轉 52 4.2.1 α=0.1 52 4.2.2 α=1 58 4.2.3 α=2 61 4.2.4 α=3 64 4.2.5 α=4 65 4.2.6 α=5, 6, 7 67 4.3受力 69 4.3.1阻力 69 4.3.2升力 70 4.3.3升阻比 71 4.3.4黏滯阻力、壓力阻力 72 4.4渦漩脫離條件 75 第五章 結論 77 5.1靜止圓柱 77 5.2旋轉圓柱 77 5.3升、阻力 78 5.4 渦旋脫落 78 第六章 未來展望 79 Reference 80" | |
| dc.language.iso | zh-TW | |
| dc.subject | 阻力 | zh_TW |
| dc.subject | 升力 | zh_TW |
| dc.subject | 類源 | zh_TW |
| dc.subject | 旋轉圓柱 | zh_TW |
| dc.subject | 低雷諾數 | zh_TW |
| dc.subject | source-like | en |
| dc.subject | lift | en |
| dc.subject | drag | en |
| dc.subject | low Reynolds number | en |
| dc.subject | spinning cylinder | en |
| dc.title | 有限圓柱旋轉時之馬格努斯效應 | zh_TW |
| dc.title | Magnus effect of flow past a rotational finite-span circular cylinder | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳國慶(Hsin-Tsai Liu),陳瑞琳(Chih-Yang Tseng),張家歐 | |
| dc.subject.keyword | 低雷諾數,旋轉圓柱,類源,升力,阻力, | zh_TW |
| dc.subject.keyword | low Reynolds number,spinning cylinder,source-like,lift,drag, | en |
| dc.relation.page | 87 | |
| dc.identifier.doi | 10.6342/NTU202102858 | |
| dc.rights.note | 同意授權(限校園內公開) | |
| dc.date.accepted | 2021-09-02 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 應用力學研究所 | zh_TW |
| 顯示於系所單位： | 應用力學研究所 | |
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