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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

List of Tables

Table 1. Design specification of the centrifugal compressor 42

Table 2. Design specification of the normal centrifugal compressor 43

List of Figures

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