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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
Umeå University, Faculty of Science and Technology, Department of Physics. Combustion and Turbulence Research Laboratory (CTL), Department of Aerospace Engineering, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., Tehran, 15875-4413, Iran.
2017 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 121, 657-675 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2017. Vol. 121, 657-675 p.
Keyword [en]
Premixed flame, Combustion, Meso scale reactor, Non-adiabatic, Propane, Oxygen
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:umu:diva-139588DOI: 10.1016/j.energy.2017.01.057ISI: 000397356400052OAI: oai:DiVA.org:umu-139588DiVA: diva2:1143024
Available from: 2017-09-20 Created: 2017-09-20 Last updated: 2017-10-03Bibliographically approved

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Baigmohammadi, Mohammadreza
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