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Numerical investigation of the effects of hydrogen enrichment on combustion and emissions formation processes in a gasoline rotary engine
- Source :
- Energy Conversion and Management. 151:136-146
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- The study aims to numerically investigate the combustion and emissions formation processes in a spark-ignition rotary engine fueled with hydrogen-gasoline blends. The Renormalization Group k-e turbulence coupled with a skeletal primary reference fuel mechanism were adopted to simulate the engine working process under 0%, 2% and 4% hydrogen volume fractions in CONVERGE software. The flow field variation and detailed combustion processes were analyzed and discussed. Results showed that a mainstream flow field along with the rotor movement was formed during the compression stroke and sustained in the combustion chamber until the exhaust valve opening. The center of the burned zone would move in same direction with the mainstream flow. Meanwhile, due to the effect of the mainstream flow, the flame propagation in direction of the mainstream flow was expedited. While the flame propagation in contrary direction was retarded, consequently, the unburned mixtures at rear region of combustion chamber suffered incomplete combustion. The distributions of nitric oxide and carbon monoxide emissions were also dominantly affected by the flow field in the combustion chamber. After hydrogen addition, the increased OH, H and O radicals concentrations combined with the intense flow flied accelerated the combustion process, which resulted in the improvement and advancement of in-cylinder pressure and temperature. Compared with original gasoline case, the peak in-cylinder pressure was increased by 9.1% and 13.7% with 2% and 4% hydrogen blends, respectively. With hydrogen enrichment, the increased in-cylinder temperature promoted the formation of nitric oxide emission. Besides, Carbon monoxide emission was decreased with the increase of hydrogen addition fraction.
- Subjects :
- Waste management
Hydrogen
Renewable Energy, Sustainability and the Environment
Chemistry
020209 energy
05 social sciences
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
Combustion
chemistry.chemical_compound
Fuel Technology
Nuclear Energy and Engineering
Volume (thermodynamics)
Internal combustion engine
Chemical engineering
0502 economics and business
0202 electrical engineering, electronic engineering, information engineering
Stroke (engine)
050207 economics
Combustion chamber
Gasoline
Carbon monoxide
Subjects
Details
- ISSN :
- 01968904
- Volume :
- 151
- Database :
- OpenAIRE
- Journal :
- Energy Conversion and Management
- Accession number :
- edsair.doi...........2fcca7a804f3f2a5657df424be351d6d