주행거리 연장용 소형 디젤엔진 구현을 위한 1D-3D 연계해석 기반 Model in the loop 연구
- Issued Date
- 2021
- Abstract
- 본 논문은 기존의 압축 착화 디젤엔진을 소형 디젤엔진으로 변환하는 과정에 있어 엔진의 연소 및 배출 특성을 평가하여 전기 자동차의 주행거리를 연장하기 위해 사용되는 발전용 디젤엔진의 실현 가능성을 조사한다. 1250RPM부터 2500RPM으로 넓은 범위의 운전조건을 채택하여 연구를 진행했다. 시뮬레이션 모델을 기반으로 EGR 적용에 따른 열적 특성과 Boost Pressure의 증가에 따른 연소 성능의 응답성을 분석하기 위해 시뮬레이션을 수행한다. EGR의 적용은 점화지연을 유발하여 낮은 연소온도로 인해 NOx의 발생을 감소시킨다. 또한 Boost Pressure의 증가는 EGR 로 인한 낮아진 성능을 보완 및 증가시켜 소형 디젤엔진이 발전용으로서 타당성을 입증해줄 수 있다. 각 운전영역의 최대 부하에서 적절한 advanced injection timing의 적용은 연소 성능의 증가와 Brake specific fuel consumption (BSFC)가 개선되었음을 확인할 수 있으며 NOx 배출량 또한 EURO-VI 배출규제에 충족하는 모습을 보여준다. 소형 디젤엔진의 성능 및 배출가스의 검증을 통해 소형 디젤엔진이 EV의 발전용 엔진으로 효과적임을 입증한다.|This study investigates the feasibility of a diesel engine to be applied as a power generator to extend the driving range of electric vehicles by evaluating the combustion and emission characteristics of the engine in the process of converting an existing diesel engine to a downsized diesel engine. The study was conducted under a wide range of operating conditions from 1250 to 2500 RPM. In addition, a simulation was performed to analyze the thermal characteristics of the engine under the application of exhaust gas recirculation (EGR) and the responsiveness of the combustion performance to an increase in the boost pressure. The EGR application caused ignition delay and reduced nitrogen oxide (NOx) emissions due to the low combustion temperature. In addition, the increase in boost pressure proved the feasibility of a downsized diesel engine to be used as power generator by improving the lowered performance with the application of EGR. By applying an appropriate advanced injection timing at the maximum load under each operating condition, both the combustion performance and brake-specific fuel consumption were improved; moreover, the NOx emission met the EURO-VI emission regulation. Through verification of the performance and emission of a downsized diesel engine, it was proved that the downsized diesel engine is an effective electric vehicle for power generators.
- Alternative Title
- Model in the loop simulation based on 1D-3D coupling analysis for down-sized diesel engine for range extender
- Alternative Author(s)
- KANGMIN JU
- Affiliation
- 조선대학교 일반대학원
- Department
- 일반대학원 기계공학과
- Advisor
- 박정수
- Awarded Date
- 2021-08
- Table Of Contents
- TABLE OF CONTENTS i
LIST OF FIGURES v
LIST OF TABLES viii
DEFINITONS & NOMENCLATURE ix
ABSTRACT xi
CHAPTER 1. INTRODUCTION 1
1.1 Motivation and objective 1
1.2 Overview of research 5
CHAPTER 2. RESEARCH BACKGROUND
2.1 Fundamental principles of internal combustion engine 7
2.1.1 Gasoline engine 7
2.1.2 Diesel engine 9
2.2 Exhaust gas recirculation (EGR) system 12
2.2.1 Fundamental principle of EGR system 12
2.2.2 High pressure EGR (HPEGR) 15
2.2.3 Low pressure EGR (LPEGR) 16
2.3 Downsized engine 17
2.3.1 Overview of downsized engine 17
2.3.2 Downsized engine based on injection strategy 18
2.3.3 Downsized engine with EGR system and turbocharger system 20
2.3.4 REEV for downsized engine 21
CHAPTER 3. METHODOLOGY 23
3.1 One-dimensional numerical analysis 23
3.1.1 Diesel engine modeling 23
a. Combustion model (DIjet) 29
b. Emission model (Extended Zeldovich & Hiroyasu) 32
3.1.2 Optimization strategy 33
a. DoE (Design of experiment) setup 33
b. Design optimizer, multi-objective Pareto 35
c. Operating conditions of engine 36
3.2 Three-dimensional CFD 38
3.2.1 Multi-cylinder modeling 38
a. Detailed chemistry solver (SAGE) 40
b. Turbulence model (RNG k-ε) 40
c. PISO algorithm 40
3.2.2 1D-3D coupling 41
CHAPTER 4. RESULTS AND DISCUSSION 43
4.1 Fundamental results for simulation 43
4.1.1 Validation of reference engine 43
4.1.2 Comparative analysis of downsized diesel engine 46
4.1.3 Prediction of downsized diesel engine with EGR-off 51
4.2 Parametric study on downsized diesel engine 57
4.2.1 The effect of EGR rate 57
4.2.2 The effect of reduced fuel mass 62
4.3 Numerical results with optimization strategy 66
4.3.1 The effect of boost pressure with DoE strategy 66
4.3.2 The effect of advanced injection timing 80
4.3.3 Multi-objective Pareto optimization at load 75%, 100% 86
4.4 The results of 1D-3D coupling 107
4.4.1 Analysis of coupled 1D-3D results 107
CHAPTER 5. CONCLUSION 119
5.1 Summary of the research 119
5.2 Future work 127
REFERENCE 128
- Degree
- Master
- Publisher
- 조선대학교 대학원
- Citation
- 주강민. (2021). 주행거리 연장용 소형 디젤엔진 구현을 위한 1D-3D 연계해석 기반 Model in the loop 연구.
- Type
- Dissertation
- URI
- https://oak.chosun.ac.kr/handle/2020.oak/17083
http://chosun.dcollection.net/common/orgView/200000489772
- Appears in Collections:
- General Graduate School > 3. Theses(Master)
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주행거리 연장용 소형 디젤엔진 구현을 위한 1D-3D 연계해석 기반 Model in the loop 연구.pdf
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