표제지
목차
용어 및 기호설명 11
요약 12
1. 서론 14
1.1. 연구배경 및 필요성 14
1.2. 연구목적 16
2. 필터 시스템의 구조해석 17
2.1. 해석 모델 및 구성 17
2.2. 구조해석 20
2.2.1. 벨로우즈 신축관 이음 20
2.2.2. 필터 바디 26
2.2.3. 배관-필터 시스템 32
2.3. 시스템의 모달해석 40
3. 필터 시스템의 유동해석 47
3.1. 해석방법 47
3.1.1. 입형도 47
3.1.2. 다공성 매질에서의 레이놀즈 수 51
3.1.3. Ergun Equation 54
3.2. 초기 필터 시스템 해석 56
3.2.1. 단일필터 59
3.2.2. 이중 필터 시스템 67
3.2.3. 삼중 필터 시스템 70
3.3. 개선 모델 필터 시스템 유동해석 75
3.3.1. 단일 필터 시스템 (개선 모델) 77
3.3.2. 개선 이중 필터 시스템 80
3.3.3. 개선 삼중 필터 시스템 84
3.4. 삼중 필터에 의한 유동특성 92
3.4.1. 필터 조밀도의 영향 92
3.4.2. 필터링 면적 102
V. 결론 112
참고문헌 114
Abstract 116
Table 1. Mechanical properties of bellows 23
Table 2. Results of structural analysis for single type bellows 25
Table 3. Results of structural analysis for double type bellows 25
Table 4. Nodes and elements of filter body 28
Table 5. Results of structural analysis for filter body 32
Table 6. Coordinate of load 34
Table 7. Results of structural analysis for pipe-filter system 39
Table 8. Source term in CFD analysis for each filter 56
Table 9. Summary of analysis results for filter system 74
Table 10. Filtering area of filter system 76
Table 11. Summary of analysis results for improved filter system 88
Table 12. Resistances in CFD analysis for each filter 92
Table 13. Filtering area (filter length) 102
Table 14. Nodes and elements of triple filter system 103
Fig. 1. Modeling of valve room 17
Fig. 2. Pipe filter system 18
Fig. 3. Composition of pipe filter system 18
Fig. 4. Examples of cleaning and drain operation of developed products 19
Fig. 5. Component of bellows type expansion joint 21
Fig. 6. 3D modeling and FE model of bellows 22
Fig. 7. Boundary and loading condition of bellows 23
Fig. 8. Stress distribution results of bellows 24
Fig. 9. Geometry of filter body 26
Fig. 10. Filter body for structural analysis 27
Fig. 11. Structural analysis result of filter body (Case I) 28
Fig. 12. Structural analysis result of filter body (Case II) 29
Fig. 13. Structural analysis result of filter body (Case III) 30
Fig. 14. Structural analysis result of filter body (Case IV) 31
Fig. 15. Pipe-filter system 33
Fig. 16. Application load position 34
Fig. 17. Structural analysis result of pipe-filter system 35
Fig. 18. Stress distribution of bellows 36
Fig. 19. Stress distribution of T-elbow 36
Fig. 20. Stress distribution of connector 36
Fig. 21. Structural analysis result of support bar 37
Fig. 22. Structural analysis result of elbow 38
Fig. 23. Stress distribution of filter body 39
Fig. 24. FE modeling for modal analysis 40
Fig. 25. Boundary conditions of pipe-filter system for modal analysis 41
Fig. 26. Natural frequencies of pipe-filter system 41
Fig. 27. Mode shape(1st mode, 25.495Hz) 42
Fig. 28. Mode shape(2nd mode, 28.185Hz) 43
Fig. 29. Mode shape(3rd mode, 38.14Hz) 44
Fig. 30. Mode shape(4th mode, 36.66Hz) 45
Fig. 31. Mode shape(5th mode, 41.33Hz) 45
Fig. 32. Mode shape(6th mode, 47.52Hz) 46
Fig. 33. Filter-mesh structure 47
Fig. 34. Initial conditions for per porous medium filter 48
Fig. 35. Circularity value 49
Fig. 36. Conceptual illustration of equivalent sphere 51
Fig. 37. Structure and section of initial filters 57
Fig. 38. Geometry target range 57
Fig. 39. Mass flow rate of filter system 58
Fig. 40. Geometry of single filter 59
Fig. 41. Pressure variation between 0.5m and 0.9m range of single filter system(circularity, forward direction) 60
Fig. 42. Center section pressure and velocity of single filter system (circularity, forward direction) 60
Fig. 43. Pressure variation between 0.5m and 0.9m range of single filter system(sphericity, forward direction) 61
Fig. 44. Center section pressure variation and velocity of single filter system(sphericity, forward direction) 62
Fig. 45. Pressure variation between 0.5m and 0.9m range of single filter system(circularity, reverse direction) 63
Fig. 46. Center section pressure and velocity of single filter system(circularity, reverse direction) 63
Fig. 47. Pressure variation between 0.5m and 0.9m range of single filter system(sphericity, reverse direction) 65
Fig. 48. Pressure variation and velocity of single filter system(sphericity, reverse direction) 65
Fig. 49. Pressure variation of single-filter system between sphericity and circularity 66
Fig. 50. FE modeling of double filter system 67
Fig. 51. Pressure variation between 0.5m and 0.9m range of double filter system(forward direction) 68
Fig. 52. Pressure variation and velocity of double filter system (forward direction) 68
Fig. 53. Pressure variation between 0.5m and 0.9m range of double filter system(reverse direction) 69
Fig. 54. Pressure variation and velocity of double filter system(reverse direction) 69
Fig. 55. FE modeling of triple filter system 70
Fig. 56. Pressure varation between 0.5m and 0.9m range of triple filter system(forward direction) 71
Fig. 57. System center section pressure and flow rate of existing triple filter (circularity, forward direction) 71
Fig. 58. Pressure variation between 0.5m and 0.9m range of triple filter system(reverse direction) 73
Fig. 59. Pressure variation and velocity of triple filter system(reverse direction) 73
Fig. 60. Structure and section of improvement filter system 75
Fig. 61. Principle of calculating filtering area 76
Fig. 62. FE modeling of improvement model for single filter system 77
Fig. 63. Pressure variation between 0.4m and 0.9m of improved single filter system(forward direction) 78
Fig. 64. Central section pressure and velocity for improved single filter system(forward direction) 78
Fig. 65. Pressure variation between 0.4m and 0.9m of improved single filter system(reverse direction) 79
Fig. 66. Central section pressure variation and velocity for improved single filter system(reverse direction) 79
Fig. 67. FE modeling of imploved double filter system 80
Fig. 68. Pressure chart and sectional pressure between 0.4m and 0.9m of improved double filter (circularity, forward direction) 81
Fig. 69. Improvement system central section pressure and flow rate for double filter (circularity, forward direction) 81
Fig. 70. Pressure chart and sectional pressure between 0.4m and 0.9m of improved double filter (circularity, reverse direction) 82
Fig. 71. Center section pressure variation for double filter system (circularity, reverse direction) 82
Fig. 72. FE modeling of improved triple filter system 84
Fig. 73. Pressure variation between 0.4m and 0.9m of improved triple filter system(forward direction) 84
Fig. 74. Improvement system central section pressure and flow rate for triple filter (circularity, forward direction) 85
Fig. 75. Pressure variation between 0.4m and 0.9m of improved triple filter system(Reverse direction) 86
Fig. 76. Central section pressure and velocity for improved triple filter system(reverse direction) 87
Fig. 77. Central section pressure variation for improved triple filter system 89
Fig. 78. Central section pressure variation for improved filter system 90
Fig. 79. Central section velocity variation for improved filter system(forward direction) 91
Fig. 80. Pressure variation between 0.4m and 0.9m of improved triple filter system(ƒ₁=ƒ₂=ƒ₃, forward direction) 93
Fig. 81. Center section pressure and velocity of improved triple filter system(ƒ₁=ƒ₂=ƒ₃, forward direction) 94
Fig. 82. Center section pressure and velocity of improved triple filter system(ƒ₁=ƒ₂=ƒ₃, reverse direction) 94
Fig. 83. Pressure variation between 0.4m and 0.9m of improved triple filter system(ƒ₁〉 ƒ₂〉 ƒ₃) 95
Fig. 84. Center section pressure and velocity of improved triple filter system(ƒ₁〉 ƒ₂〉 ƒ₃, forward direction) 96
Fig. 85. Center section pressure and velocity of improved triple filter system(ƒ₁〉 ƒ₂〉 ƒ₃, reverse direction) 96
Fig. 86. Pressure variation between 0.4m and 0.9m of improved triple filter system(ƒ₁ 〈 ƒ₂ 〈 ƒ₃) 97
Fig. 87. Center section pressure and velocity of improved triple filter system(ƒ₁ 〈 ƒ₂ 〈 ƒ₃, forward direction) 98
Fig. 88. Center section pressure and velocity of improved triple filter system(ƒ₁ 〈 ƒ₂ 〈 ƒ₃, reverse direction) 98
Fig. 89. Ratio of pressure drop of filter system 99
Fig. 90. Maximum pressure of filter system 100
Fig. 91. Maximum velocity of filter system 101
Fig. 92. Filtering area (filter length) 102
Fig. 93. FE modeling of filter system 103
Fig. 94. Pressure variation between 0.4m and 0.8m of improved triple filter system(Case I, 396mm) 104
Fig. 95. Central section pressure variation and velocity for triple filter system(Case I, 396mm) 104
Fig. 96. Pressure variation between 0.4m and 0.85m of improved triple filter system(Case II, 450mm) 106
Fig. 97. Central section pressure variation and velocity for triple filter system(Case II, 450mm) 106
Fig. 98. Pressure variation between 0.4m and 0.9m of improved triple filter system(Case III, 512mm) 107
Fig. 99. Central section pressure variation and velocity for triple filter system(Case III, 512mm) 107
Fig. 100. Pressure variation between 0.4m and 0.9m of improved triple filter system(Case V, 620mm) 109
Fig. 101. Central section pressure variation and velocity for triple filter system(Case V, 620mm) 109
Fig. 102. Ratio of pressure drop of triple filter system according to filter length 110
Fig. 103. Maximum pressure of triple filter system according to filter length 110