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Modeling of the overall equivalence ratio effects on combustion process and unregulated emissions of an SIDI methanol engine

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  • Gong, Changming
  • Peng, Legao
  • Liu, Fenghua

Abstract

A non-uniform spray-line distribution nozzle was used to form a stratified charge distribution of methanol-air mixture in-cylinder. Computational fluid dynamics were employed to simulate the methanol chemical kinetics reaction mechanism. The effects of an overall methanol-air equivalence ratio on the mixture distribution of the in-cylinder, cylinder pressure, heat release rate, cylinder temperature, and unregulated formaldehyde and unburned methanol emissions of a stratified charge spark ignition direct injection methanol engines were investigated. The simulation agrees well with experimental results. The maximum cylinder pressure, maximum heat release rate, and maximum cylinder temperature, for an overall equivalence ratio of 0.67, are 65%, 172% and 51% higher than for 0.33, respectively. Formaldehyde and unburned methanol emissions for an overall equivalence ratio of 0.67 are 97% and 95% lower than for 0.33, respectively. Formaldehyde and unburned methanol are mainly from the region close to the cylinder wall. Larger cylinder temperatures produce faster oxidation and hence generate lower concentrations of formaldehyde and unburned methanol, and vice versa. When the maximum cylinder temperature exceeds 1500 K, formaldehyde and unburned methanol emissions are approximately 30 and 300 ppm, respectively.

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  • Gong, Changming & Peng, Legao & Liu, Fenghua, 2017. "Modeling of the overall equivalence ratio effects on combustion process and unregulated emissions of an SIDI methanol engine," Energy, Elsevier, vol. 125(C), pages 118-126.
    • Handle: RePEc:eee:energy:v:125:y:2017:i:c:p:118-126
    DOI: 10.1016/j.energy.2017.02.045
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    1. Gong, Changming & Liu, Jiajun & Peng, Legao & Liu, Fenghua, 2017. "Numerical study of effect of injection and ignition timings on combustion and unregulated emissions of DISI methanol engine during cold start," Renewable Energy, Elsevier, vol. 112(C), pages 457-465.
    2. Sheng Su & Yunshan Ge & Xin Wang & Mengzhu Zhang & Lijun Hao & Jianwei Tan & Fulu Shi & Dongdong Guo & Zhengjun Yang, 2020. "Evaluating the In-Service Emissions of High-Mileage Dedicated Methanol-Fueled Passenger Cars: Regulated and Unregulated Emissions," Energies, MDPI, vol. 13(11), pages 1-15, May.
    3. Gong, Changming & Li, Zhaohui & Sun, Jingzhen & Liu, Fenghua, 2020. "Evaluation on combustion and lean-burn limitof a medium compression ratio hydrogen/methanol dual-injection spark-ignition engine under methanol late-injection," Applied Energy, Elsevier, vol. 277(C).
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    5. Gong, Changming & Si, Xiankai & Wang, Kang & Wei, Fuxing & Liu, Fenghua, 2018. "Numerical analysis of carbon monoxide, formaldehyde and unburned methanol emissions with ozone addition from a direct-injection spark-ignition methanol engine," Energy, Elsevier, vol. 144(C), pages 432-442.
    6. Kumar, T. Sathish & Ashok, B., 2021. "Critical review on combustion phenomena of low carbon alcohols in SI engine with its challenges and future directions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 152(C).

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