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Numerical analysis on original emissions for a spark ignition methanol engine based on detailed chemical kinetics

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  • Zhen, Xudong
  • Wang, Yang

Abstract

Nowadays, in order to meet the various emission regulations and improve the atmospheric environment, methanol has been used as a clean fuel to replace conventional fuels for engines. In this study, original emissions under various engine operating conditions are simulated, and the effects of different spark timings, engine speeds, mixture concentrations and combustion chamber shapes for emissions in a SI methanol engine are studied based on LES (large eddy simulation) with detailed chemical kinetics. A methanol reaction mechanism including 84-reactions, 21-species is used to simulate the methanol combustion. The results showed that carbon monoxide (CO) emission could be decreased by retarding ignition timing or increasing engine compression ratio. The formaldehyde (CH2O) had two effects, which were production and consumption. The produced formaldehyde was consumed quickly in the later stages of the combustion process, so the residual formaldehyde was very little after combustion. With the increase of equivalence ratio, the carbon monoxide emission was gradually increased, when the equivalence ratio was less than 0.9, the produced carbon monoxide was gradually decreased, and almost approached zero in lean conditions. It was difficult to improve the carbon monoxide emission for the present SI (spark ignition) methanol engine by optimizing the combustion chamber shape.

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  • Zhen, Xudong & Wang, Yang, 2015. "Numerical analysis on original emissions for a spark ignition methanol engine based on detailed chemical kinetics," Renewable Energy, Elsevier, vol. 81(C), pages 43-51.
    • Handle: RePEc:eee:renene:v:81:y:2015:i:c:p:43-51
    DOI: 10.1016/j.renene.2015.03.027
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    Cited by:

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    5. Nuthan Prasad, B.S. & Pandey, Jayashish Kumar & Kumar, G.N., 2020. "Impact of changing compression ratio on engine characteristics of an SI engine fueled with equi-volume blend of methanol and gasoline," Energy, Elsevier, vol. 191(C).
    6. 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.
    7. Gong, Changming & Wei, Fuxing & Si, Xiankai & Liu, Fenghua, 2018. "Effects of injection timing of methanol and LPG proportion on cold start characteristics of SI methanol engine with LPG enriched port injection under cycle-by-cycle control," Energy, Elsevier, vol. 144(C), pages 54-60.
    8. Ma, Baodong & Yao, Anren & Yao, Chunde & Wang, Wenchao & Ai, Youkai, 2021. "Numerical investigation and experimental validation on the leakage of methanol and formaldehyde in diesel methanol dual fuel engine with different valve overlap," Applied Energy, Elsevier, vol. 300(C).

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