Insights into the potential of EGR for reducing unregulated emissions and enhancing the performance of methanol-diesel RCCI engines at different altitudes DOI
Fenlian Huang, Yongjia Wang,

Mingding Wan

et al.

International Journal of Engine Research, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

The unburned methanol and formaldehyde emission levels at low loads partly restrain fuel application in diesel engines. Therefore, the potential of exhaust gas recirculation (EGR) for reducing unregulated emissions enhancing plateau adaptability a methanol-diesel reactivity controlled compression ignition (RCCI) engine was investigated by changing EGR ratio altitude different speed load conditions. results revealed that environment exert notable impacts on combustion behaviors RCCI At A25 condition (25% 1400 rpm), increase reduces excess air coefficient, improving overly lean mixture quality cylinder enhances efficiency. altitudes 1000 2000 m, concentrated heat release phenomenon is observed, with peak rate (HRR) increases as increases, leading to improved thermal efficiency economy. Additionally, phase delay effect caused changes specific capacity due increased partially compensated combustion-promoting diesel-methanol mixture, resulting little increasing under condition. B50 (50% 1800 continues reduce coefficient. cooling higher dominate, slowing down rate. A more noticeable lag observed Regardless operating conditions, effectively emissions. Formaldehyde are primarily related temperature. condition, lower temperature leads slight ratio, while decrease ratio. rise oxidation reaction pipe, both Under m 40% brake (BTE) highest, economy optimal, BTE 35.95%, equivalent consumption (ESFC) 235.65 g/(kW·h), 640.0 ppm, 100.0 ppm. 20% 38.09%, ESFC 222.40 654.7 100.7

Language: Английский

Insights into the potential of EGR for reducing unregulated emissions and enhancing the performance of methanol-diesel RCCI engines at different altitudes DOI
Fenlian Huang, Yongjia Wang,

Mingding Wan

et al.

International Journal of Engine Research, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

The unburned methanol and formaldehyde emission levels at low loads partly restrain fuel application in diesel engines. Therefore, the potential of exhaust gas recirculation (EGR) for reducing unregulated emissions enhancing plateau adaptability a methanol-diesel reactivity controlled compression ignition (RCCI) engine was investigated by changing EGR ratio altitude different speed load conditions. results revealed that environment exert notable impacts on combustion behaviors RCCI At A25 condition (25% 1400 rpm), increase reduces excess air coefficient, improving overly lean mixture quality cylinder enhances efficiency. altitudes 1000 2000 m, concentrated heat release phenomenon is observed, with peak rate (HRR) increases as increases, leading to improved thermal efficiency economy. Additionally, phase delay effect caused changes specific capacity due increased partially compensated combustion-promoting diesel-methanol mixture, resulting little increasing under condition. B50 (50% 1800 continues reduce coefficient. cooling higher dominate, slowing down rate. A more noticeable lag observed Regardless operating conditions, effectively emissions. Formaldehyde are primarily related temperature. condition, lower temperature leads slight ratio, while decrease ratio. rise oxidation reaction pipe, both Under m 40% brake (BTE) highest, economy optimal, BTE 35.95%, equivalent consumption (ESFC) 235.65 g/(kW·h), 640.0 ppm, 100.0 ppm. 20% 38.09%, ESFC 222.40 654.7 100.7

Language: Английский

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