표제지
요약문
Abstract
목차
기호목록 11
제1장 서론 12
제2장 GP3 RTE 엔진 개요 14
2.1. 개발 엔진의 구조적 개요 14
2.2. GP3 엔진의 포트 타이밍에 따른 행정 특성 20
제3장 수치해석 방법 24
3.1. 계산 대상 모델 24
3.2. 지배 방정식 24
3.3. 난류 모델 25
3.4. 연소 모델 28
3.4.1. 화학종 보존식 28
3.4.2. SAGE 연소모델 29
3.4.3. 반응기구 및 축소법(Reduced mechanism) 31
3.5. 경계 조건 34
3.5.1. 입·출구 조건 34
3.5.2. 벽면 조건 36
제4장 수치해석 방법의 타당성 검토 38
4.1. 격자 수렴성 검토 38
4.2. 사이클에 따른 압력 온도 변화 44
4.3. 실험 결과와 성능 비교 46
4.4. 상세 반응 기구 축소법(Reduced mechanism) 검증 48
제5장 열·유동 및 연소특성 분석 54
5.1. GP3 로터리 엔진의 4행정 및 유동 특성 54
5.2. 연소 특성 58
5.3. 반응 기구 축소법에 따른 배기 특성 60
5.4. 반응 기구 축소법에 따른 출력 및 성능 특성 62
제6장 결론 65
참고문헌 67
Table 2.1. Specifications of three GP3 rotary engine 19
Table 5.1. Engine performance indexes for reduction methods 64
Fig. 2.1. Configuration of a GP3 rotary engine. 15
Fig. 2.2. Engine core architecture showing flow of rotary engine. 17
Fig. 2.3. Engine's Rotor and housing configuration of a developing GP3 rotary engine. 22
Fig. 2.4. Comparison of IP/EP open timing between 1st and 3rd engines 23
Fig. 3.1. Example for DMR(Dynamic mechanism reduction) description. 33
Fig. 3.2. Modeled computational geometry and mesh generation(SRA=0°). 35
Fig. 4.1. Comparison of pressure during combustion duration according to base grid sizes. 40
Fig. 4.2. Comparison of fuel's burnt mass fraction during combustion duration according to base grid sizes. 41
Fig. 4.3. Temperature distribution during combustion duration according to grid sizes. 43
Fig. 4.4. Pressure and temperature variation of 1st cylinder with SRA starting from the calculation start. 45
Fig. 4.5. Comparison of experimental and CFD P-V diagram of third engine (3,000 RPM) 47
Fig. 4.6. Comparison of P-V diagrams with the GRI-Mech 3.0 reaction methods. 50
Fig. 4.7. Comparison of P during combustion duration according to GRI-Mech 3.0 reaction methods. 52
Fig. 4.8. Comparison of fuel's burned fuel fraction during combustion duration according to GRI-Mech 3.0 reaction methods. 53
Fig. 5.1. Variation of streamline, IC and EC pressure (3,000RPM firing condition) with SRA. 56
Fig. 5.2. Turbulent Kinetic Energy(TKE) at various zones of the GP3 RTE (3,000RPM firing condition) with SRA. 57
Fig. 5.3. CO₂ mole fraction at various zones of the GP3 RTE (3,000 RPM firing condition) with SRA. 59
Fig. 5.4. Emission mole fractions of exhaust gas for three reduction methods. 61