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Experimental study on the effects of mixture flow rate, equivalence ratio, oxygen enhancement, and geometrical parameters on propane-air premixed flame dynamics in non-adiabatic meso-scale reactors

Author

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  • Baigmohammadi, Mohammadreza
  • Tabejamaat, Sadegh
  • Faghani-Lamraski, Morteza

Abstract

In the present study, the effects of reactive mixture flow rate, adding oxygen to propane-air mixture, geometrical parameters, and equivalence ratio on propane-air/oxygen premixed flame dynamics in non-adiabatic meso-scale reactors were experimentally investigated. During the experiments, seven flame regimes of blow-off, blow-out, asymmetric stationary, stationary-repetitive extinction and re-ignition (RERI), forced/self-RERI, RERI-flash-back, and flash-back were observed. The results showed that increasing the reactive mixture flow rate could generally promote variety of the flame regimes and also improve flame stability in the non-adiabatic meso-scale reactors, especially in 40% and 80% oxygen-enhanced cases. Also, the results demonstrated that increasing the reactor inner diameter and equivalence ratio generally extended propane-air- oxygen flame stability and its presence range in the non-adiabatic meso-scale reactors. Moreover, it was shown that increasing the reactor length and also increasing the added oxygen to propane-air mixture more than 40% promoted flame instability and consequently restricted propane-air-oxygen flame presence range in the non-adiabatic meso-scale reactors. Also, it was shown that variations in the mixture flow rate, the reactor length and inner diameter, equivalence ratio, and oxygen concentration in propane-air mixture could significantly influence the flame average propagation speed, acoustic, and chemiluminescence in the non-adiabatic meso-scale reactors.

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  • Baigmohammadi, Mohammadreza & Tabejamaat, Sadegh & Faghani-Lamraski, Morteza, 2017. "Experimental study on the effects of mixture flow rate, equivalence ratio, oxygen enhancement, and geometrical parameters on propane-air premixed flame dynamics in non-adiabatic meso-scale reactors," Energy, Elsevier, vol. 121(C), pages 657-675.
    • Handle: RePEc:eee:energy:v:121:y:2017:i:c:p:657-675
    DOI: 10.1016/j.energy.2017.01.057
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    References listed on IDEAS

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    1. Shirsat, V. & Gupta, A.K., 2011. "A review of progress in heat recirculating meso-scale combustors," Applied Energy, Elsevier, vol. 88(12), pages 4294-4309.
    2. Wan, Jianlong & Fan, Aiwu & Yao, Hong & Liu, Wei, 2016. "Experimental investigation and numerical analysis on the blow-off limits of premixed CH4/air flames in a mesoscale bluff-body combustor," Energy, Elsevier, vol. 113(C), pages 193-203.
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    5. Alipoor, Alireza & Mazaheri, Kiumars, 2014. "Studying the repetitive extinction-ignition dynamics for lean premixed hydrogen-air combustion in a heated microchannel," Energy, Elsevier, vol. 73(C), pages 367-379.
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    Cited by:

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