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동의어 포함
Title Page
요약문
ABSTRACT
Contents
I. Introduction 9
II. Numerical Analysis 11
II-1. Reference Centrifugal Compressor 11
II-2. Turbulence Models 11
II-3. Boundary Conditions and Grid Dependency Test 13
II-4. Parametric Study 14
III. Results and Discussion 16
IV. Conclusion 44
References 45
Figure 1. Geometry of the reference centrifugal compressor 19
Figure 2. Structure of the grid system 20
Figure 3. The results of grid dependency test 21
Figure 4. Definition of geometric parameters 22
Figure 5. Variations of the peak adiabatic efficiency with the geometric variables 26
Figure 6. Variations of the stall margin with the geometric variables 30
Figure 7. Relative Mach number distributions at 50% blade height in impeller for different diameters of holes 32
Figure 8. Relative Mach number distributions at 50% blade height in impeller for different lengths of holes 34
Figure 9. Relative Mach number distributions at 50% blade height in impeller for different distances between holes and impeller 36
Figure 10. Relative Mach number distributions at 50% blade height in impeller for different numbers of holes 38
Figure 11. Relative Mach number distributions at 90% blade height in impeller for different diameter ratio of holes 39
Figure 12. Relative Mach number distributions at 90% blade height in impeller for different length of holes 40
Figure 13. Relative Mach number distributions at 90% blade height in impeller for different number of holes 41
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