표제지
목차
Nomenclatures 12
I. 서론 13
1.1. 연구배경 13
1.2. 연구내용 및 목적 17
II. 연구동향 18
2.1. 국내 연구동향 18
2.2. 국외 연구동향 24
2.3. 특허동향 분석 28
III. 극저온 액중펌프 유동해석 32
3.1. 극저온 액중펌프 임펠러 이론 검증 32
3.2. 임펠러 유동해석 36
3.3. 극저온 액중펌프 유동해석 48
IV. 극저온 액중펌프 진동해석 75
4.1. 극저온 액중펌프 주요부품 고유진동수 측정 및 모달해석 75
4.2. 극저온 액중펌프 임펠러 및 샤프트 조립체 고유진동수 해석 87
4.3. 극저온 액중펌프 임펠러 및 샤프트 회전체 동적해석 91
V. 극저온 액중펌프 구조해석 97
5.1. 극저온 액중펌프 구조해석 97
5.2. 극저온 액중펌프 임펠러 수명평가 108
VI. 극저온 액중펌프 제작 116
6.1. 극저온 액중펌프 제작 116
6.2. 극저온 액중펌프 주요 부품 제작 117
6.3. 극저온 액중펌프 유도전동기 제작 124
6.4. 극저온 액중펌프 최종 완성 128
VII. 극저온 액중펌프 성능시험 129
7.1. 극저온 액중펌프 1차 성능시험 장치 129
7.2. 극저온 액중펌프 2차 성능시험 장치 140
7.3. 극저온 액중펌프 성능시험 147
VIII. 결론 173
참고문헌 175
국문요약 178
ABSTRACT 180
[Table 2-1] The status of patent application by coteries 30
[Table 3-1] Specifications of cryogenic liquid submerged pumping system 33
[Table 3–2] Major specifications of cryogenic submerged pump 49
[Table 3–3] Control volume information by analysis domain 59
[Table 3–4] Boundary conditions for steady state 60
[Table 3–5] Boundary conditions for cavitation 61
[Table 3-6] Results of performance forecast at rated operating point 70
[Table 4–1] Results of modal test and analysis for suction part 85
[Table 4–2] Results of modal test and analysis for diffuser part 86
[Table 4–3] Results of modal test and analysis for manifold part 86
[Table 4–4] Material proprieties 88
[Table 4–5] Results of impeller and shaft rotor dynamics analysis 93
[Table 5–1] B earing load at bearing point 1 106
[Table 5–2] B earing load at bearing point 2 106
[Table 6-1] Material analysis table of major parts 116
[Table 7-1] Specification of thermal image camera 134
[Table 7-2] Result of 1st environmental experiment(이미지참조) 135
[Table 7-3] Test result comparison 146
Fig.1-1. Cryogenic liquid submerged pumping system 13
Fig.1-2. Types of cryogenic liquid pumps for operating mechanism 14
Fig.1-3. Applications of cryogenic liquid pump 15
Fig.1-4. Applications of cryogenic liquid submerged pump 16
Fig.1-5. Cryogenic submerged pump shape and internal structure 17
Fig.2-1. Cryogenic liquid submerged pump in developed countries 24
Fig.2-2. Cryogenic pump modules and systems in developed countries 25
Fig.2-3. Patent application trend 28
Fig.2-4. Patent application trend by countries 29
Fig.3-1. Impeller dimensions and velocity triangles 32
Fig.3-2. Final impeller velocity triangle 34
Fig.3-3. Comparison of impeller inner blade shape and outlet area 35
Fig.3-4. Shape of calculation grid for submerged pump impeller 38
Fig.3-5. Distribution of velocity vector in impeller 39
Fig.3-6. Flow analysis models of impeller 40
Fig.3-7. Comparisons of velocity distribution according to blade angle 41
Fig.3-8. Comparisons of streamline according to blade angle 42
Fig.3-9. Analysis models according to blade number 44
Fig.3-10. Comparisons of velocity distribution according to blade number 46
Fig.3-11. Comparisons of streamline according to blade number 47
Fig.3-12. Internal structure of cryogenic submerged pump 49
Fig.3-13. Configuration of major hydraulic components 50
Fig.3-14. Three-dimensional modeling of the inducer flow zone 51
Fig.3-15. Final closed volume for CFD 52
Fig.3-16. Final configuration of LNG submerged pump for CFD 53
Fig.3-17. Comparison of control volume for CFD at calculation domain 56
Fig.3-18. Analysis domain 59
Fig.3-19. Result of stream line 62
Fig.3-20. Results of velocity and pressure distribution at inducer 63
Fig.3-21. Results of streamline and pressure distribution at inlet parts 64
Fig.3-22. Results of velocity and pressure distribution at impeller surface span 0.5 65
Fig.3-23. Results of velocity and streamline distribution at 1st return channel(이미지참조) 66
Fig.3-24. Results of velocity and streamline distribution at 2nd impeller&diffuser(이미지참조) 67
Fig.3-25. Results of velocity and streamline distribution at 2nd diffuser&discharge pipe(이미지참조) 68
Fig.3-26. Results of cavitation break curve 69
Fig.3-27. Classification of calculation area 71
Fig.3-28. Result of total head at each point 71
Fig.3-29. Distribution of total head at 4,808rpm 72
Fig.3-30. Distribution of shaft power at 4,808rpm 72
Fig.3-31. Distribution of hydraulic efficiency 73
Fig.3-32. Result of NPSH 74
Fig.4-1. Experimental setup for impeller modal test 75
Fig.4-2. Impeller modal analysis shape and material property 76
Fig.4-3. Comparison of modal test and numerical analysis at impeller 79
Fig.4-4. LNG pump construction diagram 80
Fig.4-5. Main parts of cryogenic pump 81
Fig.4-6. Results of total deformation for suction part 82
Fig.4-7. Results of total deformation for diffuser part 83
Fig.4-8. Results of total deformation for manifold part 84
Fig.4-9. Experimental setup for main parts 85
Fig.4-10. Construction diagram of LNG submerged pump 87
Fig.4-11. Analysis model and FEM model 88
Fig.4-12. Shapes of impeller and shaft at each mode 89
Fig.4-13. Result of frequency distribution for impeller and shaft module 90
Fig.4-14. Designation of bearing stiffness and damping area 92
Fig.4-15. Selection of the natural frequency measurement section 92
Fig.4-16. Campbell diagram of impeller and shaft 93
Fig.4-17. Results of model shaft at 7,000 rpm 96
Fig.5-1. Diagram of axial fluid flow 98
Fig.5-2. Diagram of radial fluid flow 99
Fig.5-3. FEM model of impeller and shaft 101
Fig.5-4. Boundary and load conditions 102
Fig.5-5. Results of structural analysis at impeller and shaft 103
Fig.5-6. Results of bearing load 104
Fig.5-7. Assembly shape of manifold and motor housing 105
Fig.5-8. Bearing fixing positions 105
Fig.5-9. Constraint and load conditions for structural analysis at manifolder and motor... 106
Fig.5-10. Results of structure analysis on manifold and motor housing 107
Fig.5-11. 3D modeling and sectional shape of submerged pump impeller assembly 108
Fig.5-12. Material and FEM model for impeller 109
Fig.5-13. Load and contact condition at impeller 110
Fig.5-14. Principal stress distribution on torque load 111
Fig.5-15. Principal stress distribution on centrifugal load 111
Fig.5-16. Principal stress distribution on torque and centrifugal load 112
Fig.5-17. Comparison of total displacement and equivalent plastic strain 112
Fig.5-18. Results of maximum. principal stress and failure cycle at pump impeller 114
Fig.5-19. Definition of load component for life calculation 115
Fig.5-20. Result of fatigue life and damage at pump impeller 115
Fig.6-1. Wooden mould of impeller for cryogenic submerged pump 117
Fig.6-2. Wooden mould of impeller housing for cryogenic submerged pump 118
Fig.6-3. Wooden mould of diffuser for cryogenic submerged pump 118
Fig.6-4. Metal mould of impeller for cryogenic submerged pump 119
Fig.6-5. Metal mould of diffuser for cryogenic submerged pump 120
Fig.6-6. Comparisons of 3D modeling and final key product 123
Fig.6-7. Manufacturing of the other component product 123
Fig.6-8. Progress of stator manufacture 124
Fig.6-9. Manufacturing of stator core 125
Fig.6-10. Stator polishing for final product 125
Fig.6-11. Winding and final manufacturing for stator 126
Fig.6-12. Manufacturing of rotor core and assembly 126
Fig.6-13. Key components of final motor and assembly 127
Fig.6-14. Final assembly and install of cryogenic submerged pump 128
Fig.7-1 Design of 1st experimental device for cryogenic submerged pump(이미지참조) 129
Fig.7-2. 1st experimental device setup and sensor board(이미지참조) 130
Fig.7-3. Flow meter and transmitter 131
Fig.7-4. Temperature sensor and transmitter 132
Fig.7-5. Pressure gage and transmitter 133
Fig.7-6. Thermal image camera 134
Fig.7-7. Temperature distribution of 1st environmental experiment at cryogenic...(이미지참조) 136
Fig.7-8. Nitrogen vapor pressure 137
Fig.7-9. Thermal image paragraphing 138
Fig.7-10. Results of thermal image photographing 139
Fig.7-11. Design of final experimental device for cryogenic submerged pump 140
Fig.7-12. Final experimental device setup and sensor board 141
Fig.7-13. Results of thermal image photographing at final device 143
Fig.7-14. Temperature distribution of final environment experiment at cryogenic... 146
Fig.7-15. Comparison of temperature distributions at 3,000rpm 148
Fig.7-16. Comparison of pressure distributions at 3,000rpm 149
Fig.7-17. Distribution of differential head at 3,000rpm 150
Fig.7-18. Comparison of flow rate at 3,000rpm 151
Fig.7-19. Distribution of differentia head according to flow rate at 3,000rpm 152
Fig.7-20. Comparison of temperature distributions at 4,000rpm 154
Fig.7-21. Comparison of pressure distributions at 4,000rpm 155
Fig.7-22. Distribution of differential head at 4,000rpm 156
Fig.7-23. Comparison of flow rate at 4,000rpm 157
Fig.7-24. Distribution of differentia head according to flow rate at 4,000rpm 158
Fig.7-25. Comparison of temperature distributions at 4,500rpm 160
Fig.7-26. Comparison of pressure distributions at 4,500rpm 161
Fig.7-27. Distribution of differential head at 4,500rpm 162
Fig.7-28. Comparison of flow rate at 4,500rpm 163
Fig.7-29. Distribution of differentia head according to flow rate at 4,500rpm 164
Fig.7-30. Comparison of temperature distributions at 5,000rpm 166
Fig.7-31. Comparison of pressure distributions at 5,000rpm 167
Fig.7-32. Distribution of differential head at 5,000rpm 168
Fig.7-33. Comparison of flow rate at 5,000rpm 169
Fig.7-34. Distribution of differentia head according to flow rate at 5,000rpm 170
Fig.7-35. Comparison of differential head according to flow rate at LN₂ 171
Fig.7-36. Comparison of differential head according to flow rate at LNG 172