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研究生:胡晉寧
研究生(外文):Chin-Ning Hu
論文名稱:螺槳片狀空化及艉端跡流之實驗觀測與分析
論文名稱(外文):Experimental Investigation and Analysis of Sheet Cavitations and Wakes Associated with Marine Propellers
指導教授:周一志
指導教授(外文):Yi-Chih Chow
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:系統工程暨造船學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2010
畢業學年度:98
語文別:中文
論文頁數:109
中文關鍵詞:空化影像處理艉跡流質點影像測速法
外文關鍵詞:cavitationimage processing and analysiswakePIV (Particle Image Velocimetry)
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船用螺槳在高速運轉下,會產生多種空化現象(cavitation),例如:片狀空化(sheet cavitation)、葉尖渦空化(tip cavitation)、汽泡空化(bubble cavitation)等等,而空化現象會影響螺槳的效率甚至可能造成螺槳浸蝕(erosion),因此促使本論文採用目前普遍被使用的新翼形(New-Section)螺槳和KCA螺槳,並建立一研究方法來探討它們的空化特性。
本論文所建立的研究方法為拍攝螺槳空化影像並進行影像分析處理找出螺槳空化的位置和區域大小,並使用質點影像測速法(particle image velocimetry,PIV)測量螺槳艉跡流的流場結構。這些數據會與聯合船舶設計發展中心(USDDC)之數值模擬結果進行比對,以建立數值模型改善之方向與基礎。
本論文之影像處理分析方法可以有效地捕捉到關於兩顆螺槳空化區域位置的訊息,由螺槳跡流PIV量測之實驗結果可以清楚看到螺槳艉跡流的發展,而平均渦度的分佈也顯示出跡流特有的雙層結構(two-layer structure);在跡流區中,也可觀察到較高的紊流動能分布。將數值分析結果與實驗結果比對後發現,雖然在量上有些差距,但是趨勢上是相符合的。

There are many types of cavitation occurring on the surfaces of marine propellers when they operate at high speeds, for example, sheet cavitation, tip cavitation, bubble cavitation, etc. Cavitation can affect propellers, performances and/or make damages to them. This motivates us to study two commonly-used propellers, New-Section and the KCA propellers, by establishing and using a methodology for the research on the characteristics of cavitation.
This methodology focuses on image processing and analysis of cavitation to detect its location and area. And PIV (Particle Image Velocimetry) is also used to measure the flow fields of the propeller wakes. These experimental data are compared with the simulation results provided from USDDC for the purposes of numerical model improvement.
The image processing and analysis procedures enable us to effectively obtain the information about the position and the area of the sheet caviation. The results of PIV measurements clearly show the two-layer structure of the wake. In the wake region, higher distribution of turbulent kintic energy is also observed. Comparisons between result of experiments and simulations conclude that they are matched in trends.

摘要 I
Abstract II
目錄 III
圖目錄 V
符號說明 X
第一章 前言 1
第二章實驗設備與研究方法 7
2-1實驗設備 7
2-2前期研究 9
2-3實驗方法 10
2-4影像處理的方法及公式 11
2-5誤差分析 15
第三章結果分析 22
3-1螺槳R線強化步驟 22
3-2螺槳R線定位步驟 22
3-3螺槳邊界強化和定位步驟 23
3-4螺槳空化影像強化和偵測 24
3-5空化產生機率分析 25
3-6空化影像偵測誤差分析 25
3-7分析結果 27
第四章PIV測量結果 65
4-1分析程序 65
4-2 P4012 66
4-3 P4016 67
4-4實驗、數值比對分析 68
第五章結論與未來展望 91
參考文獻 93


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蔡文川、周一志,運用質點影像測速法測量螺槳葉尖渦/空泡之紊流流場,國立臺灣海洋大學碩士論文,2003

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