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研究生:馬柏心
研究生(外文):MADAN, IBRAHIM-ABDULLAH-ALI
論文名稱:沿海油輪nabla型球鼻艏長度參數之數值研究
論文名稱(外文):Numerical Study on the Length Parameter of Nabla Type Bulbous Bow of Coastal Tanker
指導教授:陳長仁
指導教授(外文):CHEN, CHANG-REN
口試委員:黎靖陳世雄周煥銘張育斌
口試委員(外文):LEE, JINGCHEN, SHIH-HSIUNGCHOU, HUANN-MINGCHANG, YUH-PING
口試日期:2023-06-01
學位類別:博士
校院名稱:崑山科技大學
系所名稱:機械與能源工程研究所
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:2023
畢業學年度:111
語文別:英文
論文頁數:80
外文關鍵詞:Bulbous bowCFDResistance performanceHull drag reduction
相關次數:
  • 被引用被引用:0
  • 點閱點閱:27
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  • 下載下載:3
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A numerical study was carried out to predict the effect of different lengths of Nabla- type bulbous bow of coastal tanker scaled model by using a commercial Computational Fluid Dynamic (CFD) code. Three different speed values were chosen for this study namely 1.5 m/s, 2 m/s, and 3 m/s which are corresponding to the Froude number of 0.15, 0.2, and 0.3. Five cases have been considered for this study namely, the original bulbous bow, the 15% extended bulbous bow, the 25% extended bulbous bow, the 50% extended bulbous bow, and the 75% extended bulbous bow. The main objective of this study is to investigate the effect of bulbous bow length and shape on the resistance reduction of the ship. The results obtained indicate that the case of the 25% extended bulbous bow is the most effective case among all cases at all speed ranges on resistance reduction with 10.6 % reduction at 1.5 m/s, 11.6% reduction at 2 m/s, and 27.1% reduction at 3 m/s. Furthermore, it has been noticed that as the speed increases the influence of the bulbous bow on resistance reduction increases. In addition, the case of 15% is the most effective at 3 m/s and achieved a 28.7% resistance reduction. Finally, the case of the 25% extended bulbous bow is recommended due to its efficiency at low, medium, and high-speed ranges.
TABLE OF CONTENTS I
ABSTRACT III
LIST OF TABLES IV
LIST OF FIGURES V
NOMENCLATURES IX
CHAPTER 1: INTRODUCTION 1
1.1. Introduction 1
1.2. The Objective of the Study 4
1.3. Scopes of the Study 4
1.4. Problem Statement 5
1.5. Hypothesis 5
CHAPTER 2: LITERATURE REVIEW 6
2.1. General 6
2.2. The Theory and Design of the Bulbous Bow 7
2.3. The Ship’s Total Resistance and Powering 10
2.4. The Effect of a Bulbous Bow on a Ship’s Drag Reduction versus Froude Number……………………………………………………………………………………………………..16
2.5. The Effect of Bulbous Bow Relative Length, Width, Depth, and Shape on Total Resistance 20
CHAPTER 3: METHODOLOGY 39
3.1. Ship Design 39
3.2. Bulbous Bow Design 41
3.3. Numerical Domain 47
3.4. Meshing 47
3.5. Numerical Method 48
3.5.1. Navier Stokes Equation and Boundary Condition 48
3.6. Mesh Independence Study 50
3.7. Convergence Condition 50
CHAPTER 4: RESULTS AND DISCUSSION 51
4.1. Original Bulbous Bow Length 52
4.2. 15% Extended Bulbous Bow 57
4.3. 25% Extended Bulbous Bow 61
4.4. 50% Extended Bulbous Bow 65
4.5. 75% Extended Bulbous Bow 69
4.6. Flow Separation 72
4.7. Comparison of All Cases 73
CHAPTER 5: CONCLUSIONS 75
REFERENCES 76

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