رسالة ماجستير بعنوان Investigation of Oil Flow and Heat Transfer in Transformer Radiator

رسالة ماجستير بعنوان
Investigation of Oil Flow and Heat Transfer in Transformer Radiator
A Thesis Submitted to
The Graduate School of Engineering and Sciences of
Izmir Institute of Technology
In Partial Fulfillment of the Requirements for the Degree of
MASTER OF SCIENCE
in Energy Engineering
by
Özben KAYMAZ
TABLE OF CONTENTS
CHAPTER 1. INTRODUCTION . 1
1.1. What is Transformer? . 5
1.2. Transformer Losses . 14
1.3. Cooling Modes 14
1.3.1. ONAN (Oil Natural – Air Natural) 16
1.3.2. ONAF (Oil Natural – Air Forced) . 17
1.3.3. OFAF (Oil Forced – Air Forced) . 18
1.3.4. ODAF (Oil Directed Air Forced) 18
CHAPTER 2. LITERATURE REVIEW 20
2.1. Transformer Life . 20
2.2. Reducing the Hot-spot Temperature . 21
2.3. Further Developments of New Methods . 24
2.4. Comparison Between CFD Simulations and Experiments . 25
2.5. Porous Media Approach in CFD Simulations 30
2.6. Complete and Slice Models 31
2.7. Transformer Winding 35
2.8. Transformer Cooling Fluids 37
2.9. Overview of Thesis According to Literature 39
CHAPTER 3. TRANSFORMER OILS 41
CHAPTER 4. NUMERICAL ANALYSIS . 48
4.1. Problem Statement 50
4.2. Modelling 51
4.3. Meshing . 53
4.4. General Settings 55
4.5. Viscous Model 55
4.6. Material Properties 56vii
4.7. Boundary Conditions 58
4.8. Solution . 60
CHAPTER 5. RESULTS AND DISCUSSION 62
5.1. CFD Results 63
5.1.1. Temperature Distribution 63
5.1.2. Velocity Vectors 65
5.1.3. Velocity Streamlines . 66
5.1.4. Heat Flux . 69
5.1.5. Comparison of Oils . 71
5.1.6. Dimensionless Numbers 74
5.2. Mesh Independence 82
CHAPTER 6. CONCLUSION . 84
REFERENCES .

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