표제지
ABSTRACT
요약문
목차
NOMENCLATURE 11
SUBSCRIPTS 12
GREEK LETTERS 12
CHAPTER 1. 서론 13
CHAPTER 2. 모델링 18
2.1. 형상과 성능 파라미터 18
2.2. 수치해석 조건 23
CHAPTER 3. 결과 29
3.1. 균일한 허니컴과 혼합형 허니컴 실의 비교 29
3.2. 삽입된 허니컴 셀 직경(D')의 영향 36
3.3. 베이스 허니컴 셀 직경(D)의 영향 43
CHAPTER 4. 결론 48
참고문헌 50
Table 1. Design parameters of the mixed honeycomb seal 22
Table 2. Numerical methods and boundary conditions. 26
Fig.1. Schematic of the effective clearance. 17
Fig.2. Schematic diagram of the mixed honeycomb seal. 20
Fig.3. Example of the calculation domain (D=6.44 mm, D'=3.22mm). 21
Fig.4. Example of the computational domain and meshes (D=6.44 mm, D'=3.22mm). 26
Fig.5. Influence of near-wall mesh setting on discharge coefficient. 27
Fig.6. Example of grid test results. 27
Fig.7. Comparison of experimental and CFD results for the solid seal. 28
Fig.8. Comparison of experimental and CFD results for the honeycomb seal (PR=1.3). 28
Fig.9. Variations in the discharge coefficients of the uniform and mixed honeycomb seals with pressure ratio and clearance (D=6.44 mm, D'=3.22 mm). 31
Fig.10. Total pressure and velocity vector plots (PR=1.6, S=1.204mm, D=6.44mm, D'=3.22 mm). 32
Fig.11. Velocity plots around the last fin (PR=1.6, S=1.204mm, D=6.44mm, D'=3.22 mm). 33
Fig.12. Variations in the discharge coefficients of the uniform and mixed honeycomb seals with pressure ratio and clearance (UHC : D=3.22mm, MHC : D=6.44 mm, D'=3.22 mm). 34
Fig.13. Static pressure plots & velocity vector for the mixed honeycomb seal (PR=1.6, S=3.192mm, UHC : D=3.22mm, MHC : D=6.44 mm, D'=3.22 mm). 35
Fig.14. Variation in the discharge coefficient of mixed honeycomb seal with pressure ratio & clearance (D=6.44mm). 39
Fig.15. Static pressure plots & velocity vector for the mixed honeycomb seal (PR=1.6, D=6.44mm, S=1.204mm). 40
Fig.16. Velocity plots around the last fin (PR=1.6, D=6.44mm, S=1.204mm). 41
Fig.17. Variation in discharge coefficient of the labyrinth seals with clearance (PR=1.6, D=6.44mm). 42
Fig.18. Variation in the discharge coefficient of mixed honeycomb seal with pressure ratio & clearance (D'=1.61mm). 45
Fig.19. Velocity plots for the mixed honeycomb seal (PR=1.6, S=1.988mm, D'=1.61mm). 46
Fig.20. Variation in discharge coefficient of the labyrinth seals with clearance (PR=1.6, D'=1.61mm). 47