Spherically expanding flames are employed to measure the laminar flame speed of premixed iso-octane/air mixtures at elevated temperatures through both experiments and numerical simulations. Iso-octane (2,2,4-trimethlypentane) is an important gasoline primary reference fuel (PRF). While most studies on laminar burning velocity of iso-octane focus on low temperatures (less than 400 K), the experiments here were conducted in an optically accessible constant volume combustion chamber between 373 K-473 K, at a pressure of 1 bar, and from ϕ=0.8 to ϕ=1.6. The effect of diluent is investigated through the addition of 15% CO2 dilution in order to simulate the effect of exhaust gas recirculation. The decreased reactivity with diluent addition reduces mixture reactivity, which can reduce the propensity for knock in spark ignition engines. All laminar flame speeds were calculated using the constant pressure method enabled via schlieren visualization of the spherically propagating flame front. Results show that laminar flame speeds of iso-octane/air mixtures at 1 bar increase by 46-51% with initial temperature increases from 373 K to 473 K. However, the addition of 15% CO2 dilution to the iso-octane/air mixtures at 1 bar and 473 K results in a 47-51% decrease in the laminar burning velocity. Numerical results obtained with CHEMKIN [1] using the kinetic mechanism of Chaos et al. [2] show excellent agreement with experimental data for ϕ=0.8-1.2; however, the kinetic mechanism slightly underestimates the experimentally observed laminar flame speeds between ϕ=1.3-1.6.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Laminar Flame Speeds of Premixed Iso-Octane/Air Flames at High Temperatures with CO2 Dilution


    Additional title:

    Sae Int. J. Adv. and Curr. Prac. in Mobility


    Contributors:

    Conference:

    WCX SAE World Congress Experience ; 2019



    Publication date :

    2019-04-02


    Size :

    10 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Laminar Flame Speeds of Premixed Iso-Octane/Air Flames at High Temperatures with CO~2 Dilution

    Duva, Berk Can / Chance, Lauren / Toulson, Elisa | British Library Conference Proceedings | 2019


    Study on the premixed laminar flames of iso-octane

    Yang, Bo / Hong, Yan-ji / Xu, Qing-yao et al. | SPIE | 2015


    Effects of CO~2 Dilution on Iso-octane Laminar and Turbulent Premixed Flames On Stoichiometric Mixture

    Kobayashi, S. / Maruyama, K. / Hayakawa, A. et al. | British Library Conference Proceedings | 2008


    20094581 Effects of CO~2 Dilution on Iso-octane Laminar and Turbulent Premixed Flames -On Stoichiometric Mixture-

    Hayakawa, A. / Maruyama, K. / Kobayashi, S. et al. | British Library Online Contents | 2009


    Study on the premixed laminar flames of iso-octane [9522-69]

    British Library Conference Proceedings | 2015