직접 분사식 수소 엔진의 연료 분사 각도와 당량비에 따른 연소 특성에 관한 수치적 연구
- Author(s)
- 오세현
- Issued Date
- 2023
- Keyword
- Hydrogen, Direct injection, Spray angle, Equivalence ratio, Combustion characteristics
- Abstract
- Hydrocarbon-based fuels currently dominate the global energy system. Hydrocarbon-based fuel are very easy to transport, store, and use, but have a fatal disadvantage of emitting a large amount of harmful exhaust gases including greenhouse gases. As environment issues emerge, national and corporate efforts are being made to achieve carbon net zero.
Many researches have been conducted to increase the thermal efficiency and performance of internal combustion engines using existing hydrocarbon fuels and to reduced their emissions. However, in order to ultimately achieve carbon neutrality, it is essential to fundamentally decarbonize fuels rather than simply reducing the reliance on internal combustion engines. Therefore, it is necessary to stop using hydrocarbon-based fuels and pursue the selective evolution of the internal combustion engine into a clean engine through the use of hydrogen, a carbon-free fuel.
In this study, a 2.0 L class research engine was designed, and research was conducted through numerical methods. Simple performance, emissions, and combustion characteristics of the research engine were analyzed through 1D simulation. Based on the 1D numerical analysis result, 3D CFD analysis was performed. The behavior of the hydrogen spray in the cylinder was visually analyzed through 3D CFD analysis. The spray pattern and behavior were analyzed by changing the spray angle considering various equivalence ratio.
A 45-degree spray angle results in the largest turbulent kinetic energy in the cylinder for all equivalence ratio conditions; however, misfires occur in the lean condition. Although hydrogen has a wide flammability range, poor mixture formation under lean conditions can result in misfires. A 60-degree spray angle results in the highest combustion temperatures and pressures for all equivalence ratio conditions and, correspondingly, the highest emissions of nitrogen oxides.
- Alternative Title
- A Numerical Analysis on Combustion Characteristics of Direct Injection Hydrogen Engine: Effect of Injection Angle and Equivalence Ratio
- Alternative Author(s)
- Sehyun Oh
- Affiliation
- 조선대학교 일반대학원
- Department
- 일반대학원 기계공학과
- Advisor
- 박정수
- Awarded Date
- 2023-08
- Table Of Contents
- CHAPTER 1. INTRODUCTION 1
1.1 Motivation and objective 1
1.2 Organization of the thesis 12
CHAPTER 2. RESEARCH BACKGROUND 14
2.1 Research background 14
2.1.1 Mixture of hydrogen and gasoline 14
2.1.2 Mixture of hydrogen and methane 18
2.1.3 Mixture of hydrogen, diesel, and ammonia 21
2.1.4 Summary 23
2.2 Commercialization of hydrogen engine 24
CHAPTER 3. METHODOLOGY 29
3.1 Introduction 29
3.2 Model descriptions 32
3.2.1 1D Simulation 35
a. Combustion model 39
3.2.2 3D CFD simulation 41
a. Turbulence model 41
b. Combustion model 41
c. Emissions model 42
d. Mesh refinement 42
CHAPTER 4. RESULTS AND DISCUSSION 45
4.1 Effect of injector angle on combustion characteristics 45
4.1.1 Mixture formation 45
4.1.2 Combustion characteristics 60
4.2 Effect of equivalence ratio on combustion characteristics 65
4.2.1 Mixture formation 65
4.2.2 Combustion characteristics 65
CHAPTER 5. CONCLUSION 72
5.1 Conclusions 72
REFERENCE 74
APPENDIX 80
A.1 Reaction mechanism 80
- Degree
- Master
- Publisher
- 조선대학교 대학원
- Citation
- 오세현. (2023). 직접 분사식 수소 엔진의 연료 분사 각도와 당량비에 따른 연소 특성에 관한 수치적 연구.
- Type
- Dissertation
- URI
- https://oak.chosun.ac.kr/handle/2020.oak/17849
http://chosun.dcollection.net/common/orgView/200000682658
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Appears in Collections:
- General Graduate School > 3. Theses(Master)
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