Comparative study on air dilution and hydrogen-enriched air dilution employed in a SI engine fueled with iso-butanol-gasoline |
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| Affiliation: | 1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, 100083, China;2. School of Transportation Science and Engineering, Beihang University, Beijing, 100191, China;3. School of Automotive and Engineering, Jilin Engineering Normal University, Changchun, 130052, China;1. Danang University of Science and Technology, The University of Danang, Viet Nam;2. Future Technology Research Center, National Yunlin University of Science and Technology, Douliou, Yunlin, 64002, Taiwan;3. Univeristy of Split, FESB, Rudjera Boskovica 32, 21000, Split, Croatia;4. University of Technology and Education, The University of Danang, Viet Nam;5. Alternative Fuels Research Laboratory (AFRL), Energy Division, Department of Mechanical Engineering, Faculty of Engineering, Erciyes University, 38039, Kayseri, Turkey;6. Department of Electronics, Faculty of Electrical Engineering and Computer Science, V?B-Technical University of Ostrava, Ostrava, Czech Republic;7. School of Engineering, The Catholic University of America, USA;8. Institute of Engineering, HUTECH University, Ho Chi Minh City, Viet Nam;1. School of Mechanical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, China;2. Key Laboratory for Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China;3. Mechanical Engineering Department, Benha Faculty of Engineering, Banha University, Benha 13512, Egypt;1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. School of Automotive and Engineering, Jilin Engineering Normal University, Changchun 130052, China |
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| Abstract: | Hydrogen and iso-butanol are notable potential alternative fuels. Hydrogen addition under air dilution conditions was investigated in this study in an attempt to enhance the thermal efficiency of spark ignition (SI) engines fueled with iso-butanol-gasoline (B33) at partial load. Hydrogen appears to have positive effect on combustion progress that is prolonged during air dilution. Under lean hydrogen-enriched mixture conditions, the brake thermal efficiency was increased by about 4% and combustion instability was reduced; the lean burn limit migrated from 1.4 to 1.8 for B33 engine after hydrogen addition. Under lean burn conditions, the durations of initial flame development and rapid burning were shortened markedly by hydrogen; both were extended by air dilution. After hydrogen addition, the unburnt HC emissions of iso-butanol-gasoline decreased markedly and carbon monoxide (CO) emissions decreased slightly. NOx emissions from hydrogen-enriched iso-butanol-gasoline increased as lambda grew near to 1.0, at a significant reduction with increasing excess air rate regardless of fuel type. The combination of hydrogen addition and air dilution exhibited a positive inhibition on particle matter (PM) emissions regardless particle in nucleation or the accumulation mode, and the particle surface concentration was reduced significantly. Finally, an improved combustion progress was observed after hydrogen addition during air dilution, as well as a higher brake thermal efficiency and wider lean burn limit with acceptable combustion stability. |
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| Keywords: | Engine Hydrogen Iso-butanol Combustion Lean burn PM |
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