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    A DNS study of CH2O and H2O2 effect on the ignition of lean PRF/air mixtures under HCCI conditions

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    Name:
    JHKim_ASPACC2019-1244.pdf
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    PDF
    Description:
    Accepted manuscript
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    Type
    Conference Paper
    Authors
    Kim, Jong Hak
    Yu, Gwang Hyeon
    Luong, Minh Bau cc
    Chung, Suk Ho cc
    Yoo, Chun Sang
    KAUST Department
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/665583
    
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    Abstract
    The impacts of dual additives including formaldehyde (CH2O) and hydrogen peroxide (H2O2) for the control of ignition of primary reference fuel (PRF)/air mixture in homogeneous charge compression ignition (HCCI) engine conditions have been investigated numerically. It is found that CH2O addition causes ignition retardation, which may result in a misfire. The chemical effect of CH2O is to eliminate OH radicals and hence increases the main ignition delay. On the other hand, the addition of H2O2 decomposes H2O2 into two OH radicals, which promotes the main ignition. It is also found that the overall combustion mode is determined by two different additives with different ignition delay characteristics. For CH2O and dual additive cases, a mixed combustion mode of both spontaneous ignition and deflagration occurs. However, the spontaneous ignition occurs dominantly in H2O2 and no additive cases with short combustion duration. These results suggest that addition of CH2O provides smooth operation of HCCI engines and besides, dual additive injection can precisely control the ignition timing for HCCI combustion.
    Sponsors
    This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2018R1A2A2A05018901). This research used the resources of the KAUST Supercomputing Laboratory and UNIST Supercomputing Center.
    Publisher
    Combustion Institute
    Conference/Event name
    12th Asia-Pacific Conference on Combustion, ASPACC 2019
    Additional Links
    https://www.researchgate.net/profile/Minh_Bau_Luong/publication/334193096_A_DNS_study_of_CH2O_and_H2O2_effect_on_the_ignition_of_lean_PRFair_mixtures_under_HCCI_conditions/links/5d1c4eb6a6fdcc2462bae68f/A-DNS-study-of-CH2O-and-H2O2-effect-on-the-ignition-of-lean-PRF-air-mixtures-under-HCCI-conditions.pdf
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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