Journal
FUEL
Volume 323, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.124197
Keywords
Variable compression ratio; EGR dilution; NOx emissions; Methanol; Combustion; Taguchi and ANOVA method
Categories
Funding
- National Natural Science Foundation of China [51876079]
- Science and Technology Development Plan of Jilin Province [20200403150SF]
- Science and technology research projects of Jilin Province education department for 13th Five Year Plan [JJKH20211086KJ]
- Interdisciplinary Integra-tion and Innovation Project of Jilin University - special fund for basic scientific research in central colleges and universities [JLUXKJC2020202]
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This study investigated the effects of compression ratio (CR) and exhaust gas recirculation (EGR) on the performance of a methanol-fueled spark ignition engine. The results showed that increasing EGR rate slowed down flame propagation and decreased heat release rate. Higher compression ratio improved combustion stability and fuel economy performance.
Methanol is a promising alternative fuel, and the effects of compression ratio (CR) and exhaust gas recirculation (EGR) of a port fuel injection spark ignition engine modified from a diesel engine fueled with methanol were studied in this paper. The results showed that with the increase of the EGR rate, flame propagation slowed down, heat release rate and the pressure rise rate decreased, and the combustion lag phenomenon was more obvious in the high EGR range. Under light load and high engine speed conditions, the combustion parameters were more sensitive to the variation of EGR rate. Increasing the CR was beneficial to improve combustion stability. Higher CR and introducing exhaust gas into cylinder both can improve break thermal efficiency and fuel economy performance. EGR strategy showed great capacity on reducing NOx emissions. By Taguchi and ANOVA analysis, it was found that higher EGR rate and small CR were benefit for NOx emission, but higher CR was suitable for decreasing BSFC, 17:1 was an optimal CR for this engine. The influence ratio of EGR on NOx emissions reached 88%, and the engine operating condition had the greatest influence on BSFC, followed by EGR rate.
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