표제지
목차
Nomenclatures 11
I. 서론 12
1.1. 연구배경 12
1.2. 관련연구 15
1.3. 연구목적 17
1.4. 연구방법 18
II. 해석이론 20
2.1. 지배방정식 20
2.2. 유동해석 기법 21
III. 노즐 설계 및 실험 23
3.1. 노즐 설계 23
3.2. 노즐 실험 24
3.2.1. 실험장치 구성 24
3.2.2. 실험방법 26
3.2.3. 3-Hole 노즐 분무실험 결과 27
3.2.4. 4-Hole 노즐 분무실험 결과 29
3.2.5. 노즐 실험 결과 비교 30
IV. 노즐 유동해석 31
4.1. 3-Hole 노즐 유동해석 31
4.1.1. 해석모델 31
4.1.2. 격자생성 32
4.1.3. 경계조건 33
4.1.4. 해석결과 34
4.2. 4-Hole 노즐 유동해석 36
4.2.1. 해석모델 36
4.2.2. 격자생성 37
4.2.3. 경계조건 38
4.2.4. 해석결과 38
4.3. Hole 개수에 따른 해석결과 비교 40
V. Gas cooler 유동해석 44
5.1. 물의 유량변화에 따른 유동해석 44
5.1.1. 해석모델 44
5.1.2. 격자생성 45
5.1.3. 경계조건 46
5.1.4. 해석결과 48
5.2. 물의 입경변화에 따른 유동해석 61
5.2.1. 경계조건 61
5.2.2. 해석결과 62
5.3. 노즐분무각도에 따른 유동해석 71
5.3.1. 경계조건 71
5.3.2. 해석결과 72
5.4. 가스유량변화에 따른 유동해석 82
5.4.1. 경계조건 82
5.4.2. 해석결과 83
5.5. Gas cooler 높이변화에 따른 유동해석 91
5.5.1. 경계조건 91
5.5.2. 해석결과 92
VI. 결론 100
참고문헌 102
국문요약 106
ABSTRACT 108
Table 1-1. Design variable list 19
Table 4-1. Mesh statistics of 3-hole nozzle 32
Table 5-1. Mesh statistics of gas cooler 45
Table 5-2. Variables used in analysis of water flow rate 47
Table 5-3. Variables used in analysis of water particle size 61
Table 5-4. Variables used in analysis of nozzle angle 71
Table 5-5. Variables used in analysis of hot gas flow rate 82
Table 5-6. Variables used in analysis of gas cooler height 91
Fig. 1-1. Preexistence heat exchanger 13
Fig. 1-2. New gas cooler 14
Fig. 3-1. Principle of fine water spray nozzle 23
Fig. 3-2. Water inflow direction 23
Fig. 3-3. Equipment used in the experiment 25
Fig. 3-4. PMAS measurement principle 26
Fig. 3-5. High-speed camera used in the experiment 26
Fig. 3-6. Water mist spraying experiment 27
Fig. 3-7. Average particle diameter measurement in case of 3-hole nozzle 28
Fig. 3-8. Average particle diameter measurement in case of 4-hole nozzle 29
Fig. 3-9. Flow rate by pressure of power sprayer 30
Fig. 4-1. Computational domain of 3-hole nozzle 31
Fig. 4-2. Grid generation of 3-hole nozzle 32
Fig. 4-3. Plane explanation 34
Fig. 4-4. Analysis results in case of 3-hole 35
Fig. 4-5. Computational domain of 4-hole nozzle 36
Fig. 4-6. Grid generation of 4-hole nozzle 37
Fig. 4-7. Analysis results in case of 4-hole 39
Fig. 4-8. Differences in analysis results by number of hole 41
Fig. 4-9. Uniformity of water volume fraction distribution in to case of flow rate 43
Fig. 5-1. Computational domain of gas cooler 44
Fig. 5-2. Grid generation of gas cooler 45
Fig. 5-3. Temperature variation by No. of particle sprays 46
Fig. 5-4. Ship engine exhaust gas component 47
Fig. 5-5. Distribution of temperature by nozzle number 49
Fig. 5-6. Plane description for flow uniformity 50
Fig. 5-7. Distribution uniformity of water volume fraction by water flow rate variation 50
Fig. 5-8. Contours in case of N=2, Qw=6 L/min, d=120 ㎛(이미지참조) 51
Fig. 5-9. Distributions of temperature by water flow rate 53
Fig. 5-10. Distributions of velocity by water flow rate 54
Fig. 5-11. Distributions of retention time by water flow rate 56
Fig. 5-12. 3D graphs display by sections according to the water flow rate - Plane 1 57
Fig. 5-13. 3D graphs display by sections according to the water flow rate - Plane 2 59
Fig. 5-14. 3D graphs display by sections according to the water flow rate - Plane 3 60
Fig. 5-15. Distribution uniformity of water volume fraction by particle size variation 63
Fig. 5-16. Contours in case of N=2, Qw=6.6 L/min, d=60 ㎛(이미지참조) 64
Fig. 5-17. Analysis results by the change of particle diameter 65
Fig. 5-18. 3D graphs display by sections according to the particle diameter - Plane 1 67
Fig. 5-19. 3D graphs display by sections according to the particle diameter - Plane 2 68
Fig. 5-20. 3D graphs display by sections according to the particle diameter - Plane 3 70
Fig. 5-21. Distribution uniformity of water volume fraction by nozzle angle variation 72
Fig. 5-22. Contours of d=150 ㎛, α=120˚ 73
Fig. 5-23. Distributions of temperature by nozzle angle 75
Fig. 5-24. Distributions of retention time by nozzle angle 76
Fig. 5-25. 3D graphs display by sections according to the nozzle angle - Plane 1 78
Fig. 5-26. 3D graphs display by sections according to the nozzle angle - Plane 2 79
Fig. 5-27. 3D graphs display by sections according to the nozzle angle - Plane 3 81
Fig. 5-28. Distribution uniformity of water volume fraction by hot gas flow rate variation 83
Fig. 5-29. Contours of Qg=30 ㎥/min, d=200 ㎛(이미지참조) 84
Fig. 5-30. Analysis results by the change of hot gas flow rate 85
Fig. 5-31. 3D graphs display by sections according to the gas flow rate - Plane 1 87
Fig. 5-32. 3D graphs display by sections according to the gas flow rate - Plane 2 88
Fig. 5-33. 3D graphs display by sections according to the gas flow rate - Plane 3 90
Fig. 5-34. Distribution uniformity of water volume fraction by gas cooler height variation 92
Fig. 5-35. Contours of gas cooler height ratio 3.3 93
Fig. 5-36. Analysis results by the change of gas cooler height 94
Fig. 5-37. 3D graphs display by sections according to the gas cooler heigh - Plane 1 96
Fig. 5-38. 3D graphs display by sections according to the gas cooler heigh - Plane 2 97
Fig. 5-39. 3D graphs display by sections according to the gas cooler heigh - Plane 3 99