표제지
목차
ABSTRACT 9
제1장 서론 11
1.1. 연구배경 및 목적 11
1.2. 연구동향 16
1.3. 연구내용 18
제2장 이론적 배경 20
2.1. 수차의 종류 20
2.2. 비속도 24
2.3. 수차의 이론 28
2.3.1. 낙차 28
2.3.2. 동력과 효율 28
2.3.3. 수차의 손실 29
2.4. 지배방정식 32
2.5. k-ω turbulence model 34
2.6. SST k-ω turbulence model 35
제3장 연구방법 38
3.1. 2차원 형상설계 39
3.1.1. 입구 39
3.1.2. 가이드베인, 점차축소관부 39
3.1.3. 흡출관 39
3.2. 2차원 형상에 대한 수치해석 40
3.2.1. 2차원 Geometry 40
3.2.2. 격자계 40
3.2.3. 경계조건 40
3.3. 3차원 형상설계 44
3.3.1. 입구 44
3.3.2. 가이드베인, 점차축소관부 44
3.3.3. 회전차 45
3.3.4. 흡출관 46
3.4. 3차원 형상에 대한 수치해석 47
3.4.1. 3차원 Geometry 47
3.4.2. 격자계 47
3.4.3. 경계조건 47
제4장 연구 결과 및 고찰 49
4.1. 2차원 형상에 대한 수치해석 결과 49
1. β각 선정 50
2. α각 선정 50
4.2. 3차원 형상에 대한 수치해석 결과 53
제5장 결론 65
참고문헌 67
Table. 1-1. Classification of hydro power generation by generation capacity 14
Table. 1-2. Small hydro power development potential 15
Table. 2-1. Turbine, generator efficiency 31
Table. 3-1. Boundary conditions for 2D numerical analysis 43
Table. 3-2. Boundary conditions for 3D numerical analysis 48
Table. 4-1. Total pressure difference between inlet and outlet of runner 63
Table. 4-2. Comparison of total efficiency using 3D analysis results 64
Fig. 1-1. Renewable power generation 14
Fig. 2-1. Type of the turbine 21
Fig. 2-2. Type of impulse water turbine 21
Fig. 2-3. Type of reaction water turbine 23
Fig. 2-4. Application range of turbine according to head and specific speed 26
Fig. 2-5. Relationship between turbine efficiency and specific speed 26
Fig. 2-6. Relationship between effective head and specific speed 27
Fig. 2-7. Effective head and head loss 31
Fig. 3-1. Parameters details of bulb turbine pipe 42
Fig. 3-2. Detailed shape for 2D numerical analysis according to α, β angle changes 42
Fig. 3-3. 2D geometry grid in the runner section 43
Fig. 3-4. Geometry for 3D numerical analysis 48
Fig. 3-5. Grid system for 3D numerical analysis 48
Fig. 4-1. Location classification of pipe 54
Fig. 4-2. Static pressure head comparison according to β angle changes 54
Fig. 4-3. Dynamic pressure head comparison according to β angle changes 55
Fig. 4-4. Total pressure head comparison according to β angle changes 56
Fig. 4-5. Static pressure difference between inlet and outlet of draft tube 57
Fig. 4-6. Dynamic pressure difference between inlet and outlet of draft tube 58
Fig. 4-7. Total pressure difference between inlet and outlet of runner 59
Fig. 4-8. Static pressure difference between inlet and outlet of draft tube 60
Fig. 4-9. Dynamic pressure difference between inlet and outlet of draft tube 61
Fig. 4-10. Total pressure difference between inlet and outlet of runner 62
Fig. 4-11. Velocity-vector contour 63