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    Simultaneous Negative PLIF and OH* Chemiluminescence Imaging of the Gas Exchange and Flame Jet from a Narrow Throat Pre-Chamber

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    simultaneous.pdf
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    Type
    Conference Paper
    Authors
    Tang, Qinglong cc
    Sampath, Ramgopal cc
    Echeverri Marquez, Manuel Alejandro
    Hlaing, Ponnya
    Sharma, Priybrat cc
    Ben Houidi, Moez cc
    Cenker, Emre
    Chang, Junseok
    Magnotti, Gaetano cc
    Johansson, Bengt cc
    KAUST Department
    Clean Combustion Research Center
    Physical Science and Engineering (PSE) Division
    Mechanical Engineering
    Mechanical Engineering Program
    Date
    2020-09-15
    Embargo End Date
    2021-03-16
    Permanent link to this record
    http://hdl.handle.net/10754/665840
    
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    Abstract
    Pre-chamber combustion (PCC) is a promising engine combustion concept capable of extending the lean limit at part load. The engine experiments in the literature showed that the PCC could achieve higher engine thermal efficiency and much lower NOx emission than the spark-ignition engine. Improved understanding of the detailed flow and combustion physics of PCC is important for optimizing the PCC combustion. In this study, we investigated the gas exchange and flame jet from a narrow throat pre-chamber (PC) by only fueling the PC with methane in an optical engine. Simultaneous negative acetone planar laser-induced fluorescence (PLIF) imaging and OH* chemiluminescence imaging were applied to visualize the PC jet and flame jet from the PC, respectively. Results indicate a delay of the PC gas exchange relative to the built-up of the pressure difference (â-? P) between PC and the main chamber (MC). This should be due to the gas inertia inside the PC and the resistance of the PC nozzle. The PC jet can be either continuous or intermittent depending on the â-? P and pressure fluctuation amplitude. Distinct PC jet with low speed is witnessed after 15° CA ATDC, which could account for the post-combustion of the PCC engine in the literature. The probability distribution analysis of the PLIF and OH* images presents a much longer penetration length of the PC jet than that of the flame jet. This means that the flame jet resides in an atmosphere of the unburned gas mixture from the PC when it appears in the MC. The flame jet and PC jet show longer penetration length and become more stable with the enriching of the prechamber charge from lean to stoichiometric. However, the overall PC jet characteristics regarding the penetration length and probability distribution become less sensitive to the PC global excess air ratio (?) when the PC charge is close to stoichiometry.
    Citation
    Tang, Q., Sampath, R., Echeverri Marquez, M., Hlaing, P., Sharma, P., Ben Houidi, M., … Johansson, B. (2020). Simultaneous Negative PLIF and OH* Chemiluminescence Imaging of the Gas Exchange and Flame Jet from a Narrow Throat Pre-Chamber. SAE Technical Paper Series. doi:10.4271/2020-01-2080
    Publisher
    SAE International
    Conference/Event name
    SAE 2020 International Powertrains, Fuels and Lubricants Meeting, PFL 2020
    DOI
    10.4271/2020-01-2080
    Additional Links
    https://www.sae.org/content/2020-01-2080/
    ae974a485f413a2113503eed53cd6c53
    10.4271/2020-01-2080
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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