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22대 대한민국 국회 국회정보길라잡이 국회의원검색
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Title Page

Contents

NOMENCLATURE 9

ABSTRACT 13

1. Introduction 16

1. EV burner 16

2. Gas turbine Combustor with vortex generator I, II 18

2. Research Methodologies 21

1. Experimental apparatus and methods 21

1.1. EV burner 21

1.2. Gas-turbine Combustor with a Vortex Generator I 26

2. Numerical methods 32

2.1. Governing equations 32

2.2. Boundary condition 33

2.3. Grid of combustor 35

2.4. Solution methods 40

2.5. Chemical reaction 41

3. Results & Discussions 43

1. Experimental results of EV burner 43

2. Experimental, Numerical study results of gas turbine combustor with a vortex generator I 59

3. Numerical combustion study results of gas turbine combustor with a vortex generator II 71

4. Conclusion 82

REFERENCES 85

국문초록 92

List of Tables

Table 1. Experimental conditions(EV burner) 25

Table 2. Experimental conditions_rated condition (combustor with a vortex generator I) 31

Table 3. Inlet conditions (combustor with a vortex generator II) 34

Table 4. Wall y+ values with respect to the number of cells for grid generation(combustor with a vortex generator I) 37

Table 5. Activation energy, pre-exponential factor, and temperature index for each reaction step 42

Table 6. Modified unmixeddness (combustor with a vortex generator I) 61

Table 7. Modified unmixeddness (combustor with a vortex generator II) 76

List of Figures

Fig. 1. EV burner geometry 21

Fig. 2. Experimental apparatus with a premixed flame combustor 23

Fig. 3. Locations of measured temperature 24

Fig. 4. Pictures and drawings of the combustor and combustor assembly 27

Fig. 5. Experimental apparatus for a lean-premixed flame test combustor 29

Fig. 6. Geometry and unstructured grids of combustor with a vortex generator I 36

Fig. 7. Geometry and unstructured grids of combustor with a vortex generator II 39

Fig. 8. Effect of inlet air temperature on NOx emissions(이미지참조) 44

Fig. 9. Effect of inlet air temperature on CO emissions 45

Fig. 10. Effect of Various Load on NOx emissions (Inlet temperature 370℃)(이미지참조) 47

Fig. 11. Effect of Various Load on CO emissions (Inlet temperature 370℃) 48

Fig. 12. Temperature characteristics at the front wall of the burner 50

Fig. 13. Temperature characteristics at the side wall of the burner 52

Fig. 14. Temperature characteristics of combustor liner 54

Fig. 15. Characteristics of pressure loss across the burner 56

Fig. 16. Characteristics of Flame extinction point 58

Fig. 17. Recirculation flow patterns without and with the vortex generator (streamline of the recirculation flow within the combustor liner at nozzle exit velocity, 20m/s) 59

Fig. 18. Shear stress calculation results with and without vortex generator (at combustor nozzle exit velocity, 20m/s) 60

Fig. 19. NOx emission characteristics relative to the changes of combustor exit velocity and equivalence ratio(이미지참조) 63

Fig. 20. CO emission characteristics relative to the changes of combustor exit velocity and equivalence ratio 65

Fig. 21. OH radical's chemiluminescence images at various operating conditions 68

Fig. 22. Location of maximum intensity of OH radical's chemiluminescence 70

Fig. 23. Vortex core regions calculated in case 0(upper plot) and case 1(lower plot) 72

Fig. 24. Cross-sectional view of burner and liner including burner-inside line 73

Fig. 25. Static-pressure profiles along the burner-inside line in case 0 and case 1(pressure value is expressed in gauge pressure) 74

Fig. 26. Radial profiles of NOx concentration at 3 different sections in cases 0 and 1(이미지참조) 78

Fig. 27. Temperature fields on xz plane in the liner 79

Fig. 28. Axial velocity fields on xz plane in a burner 81

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