The concurrent combustion of Diesel and hydrogen in a 1999 Cummins ISM 370 heavy-duty compression ignition engine was computationally investigated using a three-dimensional (3-D) computational fluid dynamics (CFD) solver and compared to literature reference data of the engine operated at 1200 rpm and 70% load. Multiple computational combustion models and chemical mechanisms spanning from global single-step kinetic reaction mechanisms, equilibrium reactions, to detailed reduced mechanisms of 118 to 128 reversible kinetic reactions were considered, along with several chemistry solvers of varying levels of sophistication. The results showed that all models based on single-step global kinetic Diesel mechanisms failed to accurately predict ignition timing, leading to significant overprediction of the maximum in-cylinder pressures. The detailed mechanisms were able to predict ignition delay, maximum in-cylinder pressure within 2%, and crank angle of maximum pressure within 0.5 ° CA. Finally, the detailed mechanisms were artificially decoupled from the Diesel and hydrogen reaction mechanisms by creating dummy species to prohibit any communication between the hydrogen and Diesel mechanism. Decoupling of the hydrogen and Diesel chemistry failed to fully ignite and combust the mixture. Therefore, the results strongly suggest that there is a significant direct chemical interaction between the Diesel and hydrogen radical pools and intermediate species. These interactions are crucial for accurate modeling of the combustion process. Simplified 1-D constant volume combustion simulations suggested that the exchange of hydrogen peroxide (H2O2) produced by the initial Diesel reactions provides a shortened reaction path for the hydrogen combustion, resulting in accelerated heat release, which, in turn, increases the Diesel reaction rate. Therefore, chemistry models for Diesel/hydrogen co-combustion simulations consisting of independent global reactions for hydrogen and Diesel combustion, respectively, without communication between these reactions should only be used with great caution.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Chemical Kinetic Modeling of Hydrogen-Diesel Co-combustion in Compression Ignition Engines


    Additional title:

    Sae Int. J. Fuels Lubr
    Sae International Journal of Fuels and Lubricants


    Contributors:


    Publication date :

    2022-03-03


    Size :

    20 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Modeling Combustion in Compression Ignition Homogeneous Charge Engines

    Ayoub, Nabil / Reitz, Rolf D. / Kong, Song-Charng | SAE Technical Papers | 1992


    Turbulent Self-Ignition and Combustion Modeling in Diesel Engines

    Pires da Cruz, A. / Baritaud, T. / Poinsot, T. | SAE Technical Papers | 1999


    Turbulent self-ignition and combustion modeling in diesel engines

    da Cruz,P. / Barutaud,T. / Poisot,T. et al. | Automotive engineering | 1999


    Hydrogen as a Combustion Modifier of Ethanol in Compression Ignition Engines

    Bika, Anil Singh / Kittelson, David B. / Franklin, Luke M. | SAE Technical Papers | 2009