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    Investigation on a high-stratified direct injection spark ignition (DISI) engine fueled with methanol under a high compression ratio

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    Type
    Article
    Authors
    Li, Yaopeng
    Bai, Xue-Song
    Tunér, Martin
    Im, Hong G. cc
    Im, Hong G. cc
    KAUST Department
    Clean Combustion Research Center
    Computational Reacting Flow Laboratory (CRFL)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2017-CPF-3319
    Date
    2018-11-19
    Online Publication Date
    2018-11-19
    Print Publication Date
    2019-02
    Permanent link to this record
    http://hdl.handle.net/10754/630138
    
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    Abstract
    This paper reports an investigation of a highly stratified methanol direct injection spark ignition (DISI) engine with a high compression ratio. The effects of the start of injection (SOI), spray-included angle, injection pressure, and spark timing (ST) on in-cylinder flow, fuel distribution, flame propagation, and engine performance are evaluated in detail. The combustion process of methanol DISI engine is very sensitive to the variation of SOI, which is closely associated with the in-cylinder turbulence and the fuel/air mixing. It is found that retarding SOI shows the similar effects on combustion process as reducing spray-included angle, which indicates that the effects of SOI are more related to the spray target (i.e., fuel distribution). The injection pressure affects the combustion process mainly through the impact on the fuel distribution in the cylinder. The flame propagates from the spark plug towards the cylinder axis along the in-cylinder swirl direction, and more fuel mass in the piston bowl promotes the flame propagation. Thus, more retarded SOI, smaller spray-included angle, and lower injection pressure are suggested at low loads to enrich the fuel concentration in the bowl to achieve a stable combustion. Under medium load, indicated thermal efficiency (ITE), peak pressure rise rate (PPRR), and nitrogen oxides (NOx) emissions can be improved with advanced SOI. ITE can also be improved by advancing ST with a slight penalty on PPRR and NOx. This study demonstrates the potential of simultaneously optimizing fuel injection and ST to improve engine performance.
    Citation
    Li Y, Bai X-S, Tunér M, Im HG, Johansson B (2019) Investigation on a high-stratified direct injection spark ignition (DISI) engine fueled with methanol under a high compression ratio. Applied Thermal Engineering 148: 352–362. Available: http://dx.doi.org/10.1016/j.applthermaleng.2018.11.065.
    Sponsors
    The work is financially supported in part by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2017-CPF-3319 and in part by the Swedish Energy Agency. The authors would like to thank Convergent Science for providing licenses for the CONVERGE software.
    Publisher
    Elsevier BV
    Journal
    Applied Thermal Engineering
    DOI
    10.1016/j.applthermaleng.2018.11.065
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S1359431118353195
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.applthermaleng.2018.11.065
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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