此論文研究目的主要是探討在穩定流域中的傾斜往復震盪圓盤周圍的流場特徵模態，給予直徑60 mm、厚度1 mm的圓盤不同的傾斜角度，透過線性滑軌驅動圓盤連接桿，帶動圓盤整體做週期性的往復直線運動，調整移動速度做為控制雷諾數大小的控制變因，移動距離做為控制KC數大小的控制變因，以質點軌跡視流法紀錄下圓盤周圍的流場瞬時衍化照片，呈現圓盤周圍之縱切面上的流場特徵行為。並以影像處理技術觀測不同位移距離下圓盤周圍所呈現出的渦漩結構，隨位移衍化時不同雷諾數以及KC數之下，其圓盤周圍的渦漩結構會產生什麼樣的變化，針對流場的特徵行為，採用質點影像測速儀技術量化圓盤周圍的全域速度場，計算速度向量場、渦度分佈圖、速度分佈及剪應力分佈。在渦流環出現的區域附近，產生大的徑向速度。當環狀渦漩形成時，會產生最大剪應力。本研究探討圓盤雷諾數對渦漩結構尺寸、等渦度分佈、速度分佈特性及剪應力特性的影響。實驗中所使用的圓盤雷諾數介於269到2295之間，移動速度位於4.5 ~ 38.4 mm/s之間，移動距離介於10 ~ 50 mm之間。

The flow characteristics of an inclined circular disk oscillating in the quiescent water were experimentally investigated. The diameter and thickenss of the circular disk are 60 mm and 1 mm, respectively. The inclined angles were varied from 0 degree to 30 degree. A linear trasversing machine was used to drive the circular disk with a linear reciprocating motion. The experimental parameters including the Reynolds number and KC (Keulegan–Carpenter) number were monitored by controlling the linear traversing machine. The instantaneous flow image in the median plane around the inclined circular disk was captured by laser-assisted particle flow visualization method. The flow characteristic regimes in the domain of Reynolds number and KC number are classified by examining the flow evolution process around the oscillating circular disk. The phased-resolved ensemble-averaged flow fields of the inclined circular disk at various flow regimes were quantified by particle image velocimetry (PIV) technique. The velocity vectors, isovorticity contours, velocity distributions, and wall shear stress distributions were calculated. The large tangential velocity is formed at around the area where the annular vortex ring appears. The maximum shear stress is therefore induced. The effect of Reynolds number, KC number, inclined angle of circular disk on the vortical structures, velocity vector fields, vorticities, velocity distributions, and wall shear stress distributions were discissed.

摘要......................................i
Abstract.................................ii
誌謝.....................................iv
目錄......................................v
表目錄..................................viii
圖目錄...................................ix
符號索引..................................xv
第一章 緒論...............................1
1.1 研究動機...........................1
1.2 文獻回顧...........................1
1.2.1 圓盤於靜止流體中自由落下...............1
1.2.2 圓盤固定在等速流場中..................2
1.2.3震盪圓盤在靜止流體中的流場行為..........3
1.3 研究目標...............................4
第二章 實驗設備、儀器與方法................. 5
2.1 實驗設備...........................5
2.2 實驗儀器...........................5
2.3 實驗方法...........................6
2.3.1 流場可視化...........................7
2.3.2 質點影像速度儀.......................7
第三章 圓盤的流場特徵衍化過程................9
3.1 圓盤傾斜10°流場特徵.....................9
3.2 圓盤傾斜20°流場特徵....................15
3.3 圓盤傾斜30°流場特徵....................21
3.4 流場特徵模態...........................27
第四章 平均速度場..........................28
4.1 平均速度向量場.........................28
4.1.1 圓盤傾斜10°速度場....................28
4.1.2 圓盤傾斜20°速度場....................31
4.1.3 圓盤傾斜30°速度場....................32
4.2 環狀渦漩特徵分析.......................35
4.2.1 圓盤傾斜10°渦度......................35
4.2.2 圓盤傾斜20°渦度......................37
4.2.3 圓盤傾斜30°渦度......................39
第五章 剪應力..............................42
5.1 速度分佈圖.............................42
5.2 剪應力分析.............................43
第六章 結論與建議...........................45
6.1 結論...................................45
6.2 建議...................................47
參考文獻...................................150
Extended Abstract.........................152

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