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    Optical diagnostics and multi-point pressure sensing on the knocking combustion with multiple spark ignition

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    Optical diagnostics and multi-point pressure sensing on the knocking combustion with multiple spark ignition.pdf
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    3.049Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2023-10-22
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    Type
    Article
    Authors
    Shi, Hao cc
    Tang, Qinglong cc
    Uddeen, Kalim cc
    Magnotti, Gaetano cc
    Turner, James W. G. cc
    KAUST Department
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Clean Combustion Research Center
    Mechanical Engineering
    KAUST Grant Number
    URF/1/3710-01-01
    Date
    2021-10-22
    Online Publication Date
    2021-10-22
    Print Publication Date
    2022-02
    Embargo End Date
    2023-10-22
    Submitted Date
    2021-07-29
    Permanent link to this record
    http://hdl.handle.net/10754/672932
    
    Metadata
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    Abstract
    Engine knock is an abnormal combustion phenomenon that limits the thermal efficiency and service life of spark-ignition engines. A better understanding of the knock mechanisms and characteristics is beneficial to knock alleviation and engine efficiency improvement. In this study, a metal liner with four evenly-spaced spark plugs in the periphery of the combustion chamber is designed to initiate knock from different positions. Four spark strategies are applied to the single-cylinder optical research engine and six pressure sensors are utilized to analyze the local pressure oscillations in the cylinder. The knocking combustion is investigated by simultaneous 72 kHz high-speed imaging and 6-point pressure sensing. The experimental results indicate that using multiple spark-ignition could promote knock intensity, advance the start of auto-ignition and introduce more acoustic resonance modes. The center pressure sensor is more sensitive to the first radial resonant mode (0, 1) of the knock pressure oscillation, while the side sensors are more sensitive to the first and second circumferential resonant modes (1, 0) and (2, 0). The knock onset judged by natural flame photography is earlier than that by pressure analysis because the auto-ignition event happens first and induces the subsequent pressure fluctuation. Natural flame luminosity analysis demonstrates that the initial auto-ignition sites only cause weak pressure oscillations, and the instantaneous combustion of the remaining end-gas increases the heat release rate significantly and gives rise to more violent pressure oscillations. Statistically, the maximum amplitude of pressure oscillation follows an exponential relationship with the peak mean flame luminosity. The end-gas resides in the gaps among the flame fronts generated by different spark strategies while the first auto-ignition sites are not evenly distributed in the end-gas zone. This fact gives insights into the local temperature non-uniformity of the end gas zone that affects the spatial distributions of the initial auto-ignition sites in the cylinder.
    Citation
    Shi, H., Tang, Q., Uddeen, K., Magnotti, G., & Turner, J. (2022). Optical diagnostics and multi-point pressure sensing on the knocking combustion with multiple spark ignition. Combustion and Flame, 236, 111802. doi:10.1016/j.combustflame.2021.111802
    Sponsors
    This work was funded by competitive research funding (URF/1/3710-01-01) from King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2021.111802
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0010218021005459
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2021.111802
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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