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系統識別號 U0026-2301201804203000
論文名稱(中文) 開縫圓柱渦流溢放現象之研究
論文名稱(英文) Investigation of Slits Effects on Vortex Shedding Phenomena from a Flow over Circular Cylinder
校院名稱 成功大學
系所名稱(中) 航空太空工程學系碩士在職專班
系所名稱(英) Department of Aeronautics & Astronautics (on the job class)
學年度 106
學期 1
出版年 107
研究生(中文) 劉力愷
研究生(英文) Li-Kai Liu
學號 P47011011
學位類別 碩士
語文別 中文
論文頁數 107頁
口試委員 指導教授-呂宗行
口試委員-張政仁
口試委員-魏欽益
中文關鍵字 渦流溢放  快速傅立葉轉換  開縫圓柱 
英文關鍵字 vortex shedding  FFT  cylinder with silt 
學科別分類
中文摘要 自Strouhal發現流場中的圓柱產生渦流溢放現象之後,流體力學在其理論上的推導及工程上的應用皆有相當的發展。而鈍形體表面流場的研究始終為許多專家熱衷的研究課題之一,其原因乃是其空氣動力特性,不論在航空、土木、建築、海洋、量測等工程領域,均有重要之應用。圓柱流場是個複雜且經典的流體力學基本問題,均勻流通過圓柱後常見上下搖擺的渦流溢放現象,這是尾部渦流上下交互作用,導致的週期性變化。然而渦流溢放現象常在我們的日常生活裡發生,就如同飛機翼後渦流的形成及電塔鋼索的震盪;近年來,如何改善渦流溢放現象一直是受到許多研究人員所重視的課題,而利用開縫圓柱來改善渦流溢放現象研究也行之有年,但甚少有人探討開縫圓柱中角度對於其流場特性之影響。本研究希望藉由改變開縫圓柱的角度,探討其對渦流溢放現象造成影響。
英文摘要 Ever since Strouhal’s discovery of Vortex Shedding Phenomenon in the circular cylinder in a flow field, the development of fluid mechanics in its theoretical deduction and application in engineering has shown significant growth. The study on the flow field of the surface of blunt body has remained one of the most popular research topics among the professionals. The key reason is its aerodynamic characteristics and the application in engineering fields such as aerospace engineering, civil engineering, construction, ocean engineering and measurement. The flow field of circular cylinder is a classic yet complicated question of fluid mechanics. Vortex Shedding Phenomenon, an oscillating flow occurred because of the cross interaction of vortices at the bottom of cylinder when the flows past the circular cylinder. The Vortex Shedding Phenomenon can be easily observed in our everyday life. For example, the swirling flow of air produced behind the airplane wings and the vibration of steel cables in electrical towers. Researchers have been working hard in recent years to suppress the phenomenon of vortex shedding. The research on reduction of vortex shedding phenomenon by adopting circular cylinder with silt has been studied for years. However, few researchers study the effect of changes of the angle of circular cylinder with silt on its flow field characteristics. Therefore, this research aims to investigate the phenomenon of vortex shedding being affected by the changes of the angle of circular cylinder with silt.
論文目次 摘要 I
Abstract I
誌謝 IV
目錄 VII
表目錄 IX
圖目錄 X
符號 XVI
第一章 緒論 1
1-1前言 1
1-2文獻回顧 3
1-2-1 圓柱渦流流場 3
1-2-2渦漩剝離控制 5
1-3研究動機與目的 10
第二章 流場模擬 19
2-1流場模擬 19
2-2 CFD-RC數值模擬軟體簡介 19
2-3模擬規劃 24
第三章 分析方法與規劃 29
3-1圓柱繞流現象 29
3-2渦流溢放行為之分析參數 30
3-3模擬網格測試 33
3-4開縫圓柱之觀測點 34
3-5 圓柱開縫角度 35
第四章 結果與討論 45
4-1數值模擬討論 45
4-2模擬圓在固定雷諾數下探討分離點的位置 45
4-3雷諾數5000下開縫圓柱隨角度不同的變化 47
4-4雷諾數5000下不同開縫圓柱的壓力表現 48
4-5雷諾數5000下開縫圓柱內流體頻率的變化 49
4-6當雷諾數改變不同開縫圓柱的影響 51
第五章 結論與建議 103
5-1結論 103
5-2建議 104
參考文獻 105
參考文獻 參考文獻
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