Colorless distributed combustion (CDC) is a novel method to enhance flame stability and thermal field uniformity, increase combustion efficiency, and reduce pollutants’ emission. CDC is achieved through the use of a carefully prepared fuel–oxidizer mixture along with reactive species. In this study, a partially premixed, swirl-assisted cylindrical combustor utilized a propane–air flame with either nitrogen or carbon dioxide gas in order to reduce the oxygen concentration of the oxidizer. OH* chemiluminescence signatures were used to determine transition to distributed combustion condition. The results showed transition to CDC at approximately 15% using N2 and 17% using CO2 dilution. Emission of NO and CO under CDC condition showed NO levels of only 2 or 1 ppm using N2 or CO2 dilution, respectively. High-frequency PIV (3 kHz) was used to determine the flow velocity structure and eddy size effects on flame stability and emissions. Increase in dilution enhanced both the radial and axial mean and fluctuating velocities under CDC that foster mixing. Additionally, the Kolmogorov length decreased with increase in dilution resulting in smaller eddy size particularly in the swirl lobe region, which enhanced turbulent dissipation that resulted in lower peak temperatures and reduced thermal NOx emission. Reduced viscosity using CO2 dilution provided a stronger effect in reducing NO as compared to N2 as the diluent.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Impact of Flowfield on Pollutants’ Emission from a Swirl-Assisted Distributed Combustor


    Additional title:

    Lect.Notes Mechanical Engineering



    Conference:

    National Conference on IC Engines and Combustion ; 2019 ; Kurukshetra, India November 01, 2019 - November 04, 2019



    Publication date :

    2020-08-19


    Size :

    9 pages





    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




    Impact of Flowfield on Pollutants’ Emission from a Swirl-Assisted Distributed Combustor

    Feser, Joseph S. / Karyeyen, Serhat / Gupta, Ashwani K. | TIBKAT | 2021


    Flowfield calculations in an MHD swirl combustor

    GUPTA, A. / KHAN, H. / BEER, J. et al. | AIAA | 1981


    Large Eddy Simulation of the Turbulent Flowfield in a Swirl Stabilized Annular Combustor

    Kim, J. / Sung, H. / Min, D. et al. | British Library Conference Proceedings | 2009


    Large Eddy Simulation of the Turbulent Flowfield in a Swirl Stabilized Annular Combustor

    Kim, Jong-Chan / Sung, Hong-Gye / Min, Dai-Ki et al. | AIAA | 2009


    Impact of Confinement on a Swirl Burner Flowfield

    Khalil Hasan, Ahmed E. / Brooks, Jonathan M. / Gupta, Ashwani K. | AIAA | 2017