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研究生:陳永輝
研究生(外文):Yung-hui Chen
論文名稱:以PIV量測垂直射流在波浪作用下之流場特性
論文名稱(外文):Application of PIV Technique to Investigation of Vertical Round Jet Discharged into Wave Environment
指導教授:許泰文許泰文引用關係
指導教授(外文):Tai-wen Hsu
學位類別:碩士
校院名稱:國立成功大學
系所名稱:水利及海洋工程學系碩博士班
學門:工程學門
學類:河海工程學類
論文種類:學術論文
畢業學年度:96
語文別:中文
論文頁數:72
中文關鍵詞:紊流射流流場垂直射流質點影像測速儀渦流規則波
外文關鍵詞:PIVvertical jetturbulent jet flow fieldregular wavevortex
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本文利用質點影像測速技術 (PIV) 去量測並觀察規則波作用下的紊流射流流場。實驗藉由固定射流初始速度,改變不同的波浪週期,來比較不同射流與波浪流速比下的流場與渦度變化,並畫出不同高度的速度剖面,觀察射流沿程發展情況。根據試驗結果發現,射流出口附近的流體會被垂直射流一同往上帶出,而垂直流速會隨著高程增加而逐漸減少,在波浪的作用下射流主體會沿流向逐漸彎曲,並隨著波峰和波谷週期性擺動。當波浪水粒子向下運動時,會產生大尺度的渦流,發現波浪的相對水深 h/L 愈小,大尺度渦流的中心結構愈長。而且當週期愈大,射流的速度衰減愈快且分佈會愈平均。
The Particle Image Velocimetry (PIV) is applied to measure and visualize the effects of turbulent jet flow field with regular wave condition. In order to compare the difference of jet flow field and vorticity between various ratios of jet flow and wave flow velocity, we set jet speed as a constant value instead of changing wave speed as well. Besides, the trajectory of jet flow is also made by plotting velocity profile in various heights.
According to the experiment results, it is found that the vertical velocity of jet flow decrease along with the trajectory, and keep a periodic motion with wave crest and trough. Large scale vortex is observed when water particles move downward during the process. When the relative water depth, h/L, becomes smaller, the central structure of large scale vortex becomes longer as well. And when the wave period becomes longer, the jet velocity decrease hurry and distribution more homogenize.
中文摘要..................................................I
Abstract.................................................II
致謝....................................................III
目錄.....................................................IV
表目錄..................................................VII
圖目錄.................................................VIII
符號說明.................................................XI
第一章 緒論...............................................1
1.1 研究動機與目的.......................................1
1.2 前人研究.............................................6
1.2.1 射流之數值模擬研究................................6
1.2.2 射流之試驗研究....................................9
1.3 本文組織............................................13
第二章 試驗佈置與量測方法................................14
2.1 造波及波高擷取設備..................................14
2.2 流場可視化設備......................................17
2.2.1. 追蹤質點........................................17
2.2.2. 切面光源........................................17
2.2.3. 影像擷取設備....................................18
2.3 PIV量測系統.........................................19
2.3.1. 追蹤質點........................................19
2.3.2. 同步控制系統 (Synchronizer).....................20
2.3.3. CCD影像擷取系統 (CCD Camera)....................21
2.3.4. 雷射切光頁系統..................................22
2.3.5. 控制及分析軟體..................................22
2.3.6. PIV系統運作與分析原理...........................23
2.4 PIV量測方法.........................................25
2.5 試驗儀器調校........................................27
2.5.1. 雷射與焦距校正..................................27
2.5.2. 流量校正........................................28
2.5.3. 影像品質校正....................................28
2.6 試驗步驟............................................28
第三章 試驗配置與波浪條件................................30
3.1 試驗配置............................................30
3.2 試驗波浪條件........................................34
3.3 射流流速驗證........................................35
第四章 結果與討論........................................36
4.1 相位定義............................................36
4.2 波高水位驗證........................................38
4.3 渦度計算............................................41
4.4 流速、流線與渦度分佈................................42
4.4.1 自由射流.........................................42
4.4.2 射流與波流交互作用 (FOV1)........................46
4.4.3 射流與波流交互作用 (FOV2)........................56
第五章 結論與建議........................................66
5.1 結論................................................66
5.2 建議................................................68
參考文獻.................................................69
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