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    Optical Diagnostics of Isobaric and Conventional Diesel Combustion in a Heavy-Duty Diesel Engine

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    NIRAJ_SAE WCX 2022 paper_KAUST.pdf
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    1.500Mb
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    Embargo End Date:
    2022-09-29
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    Type
    Conference Paper
    Authors
    Panthi, Niraj cc
    Goyal, Harsh cc
    AlRamadan, Abdullah S.
    Badra, Jihad
    Magnotti, Gaetano cc
    KAUST Department
    King Abdullah University of Science and Technology
    Mechanical Engineering
    Physical Science and Engineering (PSE) Division
    Clean Combustion Research Center
    Mechanical Engineering Program
    Date
    2022-03-29
    Embargo End Date
    2022-09-29
    Permanent link to this record
    http://hdl.handle.net/10754/676414
    
    Metadata
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    Abstract
    Compared to conventional diesel combustion (CDC), isobaric combustion can achieve higher thermal efficiency while lowering heat transfer losses and nitrogen oxides (NOx). However, isobaric combustion suffers from higher soot emissions. While the aforementioned trends are well established, there is limited literature about the high-temperature reaction zones, the liquid-phase penetration distance, and the flame tip propagation velocity of isobaric combustion. In the present study, the line-of-sight integrated imaging of Mie-scattering, combustion luminosity, and CH* chemiluminescence were conducted in an optically accessible single-cylinder heavy-duty diesel engine. The engine was equipped with a flat-bowl-shaped optical piston to allow bottom-view imaging of the combustion chamber. The experiments were conducted using n-heptane fuel for CDC and isobaric combustion modes. The peak cylinder pressure (PCP) and the fuel mean effective pressure (Fuel MEP) for both combustion modes are kept as 70 bar and 19 bar, respectively. For a given combustion mode, flame image velocimetry (FIV) analysis was performed on the consecutive combustion luminosity image pairs to obtain in-flame flow-field details, and the liquid-phase penetration distance and flame tip propagation velocity were also estimated. The combustion luminosity and FIV analysis show that compared to CDC, isobaric combustion has resulted in less prominent flame-flame interactions, which explained the lower heat release rate. Double-injection-based CDC has resulted in a shorter spray penetration distance compared to triple-injection-based isobaric combustion; however, shorter than the boundary of piston-bowl wall. In addition, it was found that CDC has a sudden increase in flame tip propagation velocity preceded by flame propagation due to flame-piston bowl impingement from the second injection and successive movement towards the squish region. However, isobaric combustion showed a trend of constant or slightly decreased flame tip propagation velocity for which the second injection flames remain within the piston bowl wall.
    Citation
    Panthi, N., Goyal, H., AlRamadan, A. S., Badra, J., & Magnotti, G. (2022). Optical Diagnostics of Isobaric and Conventional Diesel Combustion in a Heavy-Duty Diesel Engine. SAE Technical Paper Series. https://doi.org/10.4271/2022-01-0418
    Sponsors
    This paper is based on work supported by Saudi Aramco Research and Development Center FUELCOM program under Master Research Agreement Number 6600024505/01. FUELCOM (Fuel Combustion for Advanced Engines) is a collaborative research undertaking between Saudi Aramco and KAUST intended to address the fundamental aspects of hydrocarbon fuel combustion in engines, and develop fuel/engine design tools suitable for advanced combustion modes.
    Publisher
    SAE International
    Conference/Event name
    SAE 2022 Annual World Congress Experience, WCX 2022
    DOI
    10.4271/2022-01-0418
    Additional Links
    https://www.sae.org/content/2022-01-0418/
    ae974a485f413a2113503eed53cd6c53
    10.4271/2022-01-0418
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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