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Internal entrainment effects on high intensity distributed combustion using non-intrusive diagnostics

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  • Khalil, Ahmed E.E.
  • Gupta, Ashwani K.

Abstract

High intensity colorless distributed combustion (CDC) provides high efficiency combustion with stable operation and ultra-low emissions. The role of internal entrainment of hot reactive gases requires further investigation in order to obtain minimum requirements for distributed combustion. In this paper, the impact of internal entrainment of reactive gases on the flame behavior and structure is investigated with focus on fostering distributed combustion. A mixture of nitrogen and carbon dioxide was introduced to the air stream prior to mixing with the fuel to simulate the recirculated product gases from within the combustor. Increase dilution with nitrogen or carbon dioxide increased the reaction zone volume to result in uniform distribution of CH∗ and OH∗ chemiluminescence signal and uniform equivalence ratio (measured optically). These conditions replaced the normally present blue flame with a uniform almost invisible faint bluish flame. The increased entrainment also decreased NO chemiluminescence significantly for the same amounts of fuel burned. The chemiluminescence data suggested that lowering oxygen concentration from 21% to 15% resulted in improved distributed combustion conditions with the reaction volume occupying most of the combustor. These conditions provide the minimum entrainment requirement and reduction of oxygen concentration for achieving distributed combustion. Results obtained at different equivalence ratios and entrained gas temperatures showed similar behavior at oxygen concentration of 15%. The reaction distribution was further enhanced at lower oxygen concentration (∼11%) with further reduction in pollutants emissions.

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  • Khalil, Ahmed E.E. & Gupta, Ashwani K., 2015. "Internal entrainment effects on high intensity distributed combustion using non-intrusive diagnostics," Applied Energy, Elsevier, vol. 160(C), pages 467-476.
    • Handle: RePEc:eee:appene:v:160:y:2015:i:c:p:467-476
    DOI: 10.1016/j.apenergy.2015.09.053
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    References listed on IDEAS

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    1. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2013. "Fuel flexible distributed combustion for efficient and clean gas turbine engines," Applied Energy, Elsevier, vol. 109(C), pages 267-274.
    2. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2014. "Velocity and turbulence effects on high intensity distributed combustion," Applied Energy, Elsevier, vol. 125(C), pages 1-9.
    3. Khalil, Ahmed E.E. & Arghode, Vaibhav K. & Gupta, Ashwani K., 2013. "Novel mixing for ultra-high thermal intensity distributed combustion," Applied Energy, Elsevier, vol. 105(C), pages 327-334.
    4. Arghode, Vaibhav K. & Gupta, Ashwani K., 2010. "Effect of flow field for colorless distributed combustion (CDC) for gas turbine combustion," Applied Energy, Elsevier, vol. 87(5), pages 1631-1640, May.
    5. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2015. "Impact of internal entrainment on high intensity distributed combustion," Applied Energy, Elsevier, vol. 156(C), pages 241-250.
    6. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2011. "Swirling distributed combustion for clean energy conversion in gas turbine applications," Applied Energy, Elsevier, vol. 88(11), pages 3685-3693.
    7. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2011. "Distributed swirl combustion for gas turbine application," Applied Energy, Elsevier, vol. 88(12), pages 4898-4907.
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    1. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2017. "Flame fluctuations in Oxy-CO2-methane mixtures in swirl assisted distributed combustion," Applied Energy, Elsevier, vol. 204(C), pages 303-317.
    2. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2017. "Acoustic and heat release signatures for swirl assisted distributed combustion," Applied Energy, Elsevier, vol. 193(C), pages 125-138.
    3. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2018. "Fostering distributed combustion in a swirl burner using prevaporized liquid fuels," Applied Energy, Elsevier, vol. 211(C), pages 513-522.
    4. Karyeyen, Serhat & Feser, Joseph S. & Gupta, Ashwani K., 2019. "Swirl assisted distributed combustion behavior using hydrogen-rich gaseous fuels," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    5. Feser, Joseph S. & Bassioni, Ghada & Gupta, Ashwani K., 2018. "Effect of naphthalene addition to ethanol in distributed combustion," Applied Energy, Elsevier, vol. 216(C), pages 1-7.
    6. Enagi, Ibrahim I. & Al-attab, K.A. & Zainal, Z.A., 2018. "Liquid biofuels utilization for gas turbines: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 90(C), pages 43-55.

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