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    Optical study on the fuel spray characteristics of high-pressure isobaric combustion using four consecutive injections

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    Optical study on the fuel spray characteristics of the four-consecutive-injections strategy used in high-pressure isobaric combustion.pdf
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    Type
    Conference Paper
    Authors
    Tang, Qinglong cc
    Sampath, Ramgopal cc
    Sharma, Priybrat cc
    Nyrenstedt, Gustav cc
    AlRamadan, Abdullah
    Ben Houidi, Moez cc
    Badra, Jihad
    Johansson, Bengt cc
    Magnotti, Gaetano cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020
    Embargo End Date
    2020-10-14
    Submitted Date
    2019
    Permanent link to this record
    http://hdl.handle.net/10754/661334
    
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    Abstract
    High-pressure isobaric combustion using the double compression expansion concept was proposed to obtain higher brake thermal efficiency than the conventional diesel combustion. Experiments in metal engines have shown that four consecutive injections delivered by a single injector can achieve isobaric combustion. Improved understanding of the detailed fuel-air mixing with multiple consecutive injections is needed to optimize the isobaric combustion and reduce engine emissions. In this study, we explored the fuel spray characteristics of the four consecutive injections strategy using fuel-tracer planar laser-induced fluorescence (PLIF) imaging on a heavy-duty optical engine under non-reactive condition. Toluene of 2% by volume was added into the n-heptane fuel and served as the tracer. The fourth harmonic of a 10 Hz Nd:YAG laser was applied for excitation of toluene. One of the fuel sprays was bisected by the vertical laser sheet and visualized by a camera from the side view. The PLIF images of the premixed mixture formed by port fuel injection were used to normalize the direct-injection PLIF images and correct the effect of non-uniformity of the laser sheet. The focus shift of the camera lens was removed by using a Sheimpflug adapter and image distortion caused by the optical piston and windows were corrected by image post-processing. The effect of the later fuel injection on the overall fuel-air mixture distribution was evaluated by comparing the in-cylinder fuel distribution with different combinations of the four injections. The present study also provides insight into the potential interaction between the fuel spray and piston bowl wall and piston top. This interaction was found alleviated with the increasing of the in-cylinder pressure.
    Sponsors
    The paper is based upon work supported by Saudi Aramco Research and Development Center FUELCOM3 program under Master Research Agreement Number 6600024505/01. FUELCOM (Fuel Combustion for Advanced Engines) is a collaborative research undertaking between Saudi Aramco and King Abdullah University of Science and Technology (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
    WCX SAE World Congress Experience
    Additional Links
    https://saemobilus.sae.org/content/2020-01-1129/#abstract
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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