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Aerodynamic and fuel dilution effects on non-premixed gas jet flames

Erete, James Ikpeme (2015) Aerodynamic and fuel dilution effects on non-premixed gas jet flames. PhD thesis, University of Leeds.

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Abstract

This study examines the changes in the flame structure and emissions from laboratory-scale flares over a wide range of test conditions. In the initial study, the experimental measurements examined the effect of varying the fuel jet velocity on the flame temperature, flame structure, and the inflame and post-flame composition of species in methane flames. The test conditions involved laboratory-scale flares in the attached and lifted regimes under laminar, transitional and turbulent conditions. The results show that while an increase in the jet velocity leads to an increase in EINOx, this also leads to a decrease in EICO, and similarly, EICO decreases with decreasing flame luminosity and sooting propensity. The second study examined the effect of CO2 dilution on methane jet flames where CO2, which was used as a diluent, was injected into the fuel-jet stream. The dilution-induced extinction was achieved by fixing the fuel flow rate, while varying the diluent mole fraction. The effect of the changes in the flame length, lift-off height, and in the emissions due to this dilution was studied. Amongst other findings, this study shows that CO2 is effective in reducing the EINOx in the postflame region of methane jet flames at Reynolds number ranging from 1584 to 14254, and that soot formation is suppressed at higher diluent concentrations in the jet flame. The final study involved the characterisation and the comparison of the inflame composition of major species and the post-flame soot and pollutant emissions generated from the combustion of methane and propane flames. The results show that the dilution of the fuel stream with CO2 reduces the size of soot aggregates in propane flames and that the soot emission factor decreases at increased diluent concentrations. In addition, for the same test conditions utilised in this study, the EICO and EINOx are higher in methane flames than in propane flames.

Item Type: Thesis (PhD)
Academic Units: The University of Leeds > Faculty of Engineering (Leeds)
The University of Leeds > Faculty of Engineering (Leeds) > School of Chemical and Process Engineering (Leeds)
The University of Leeds > Faculty of Engineering (Leeds) > School of Chemical and Process Engineering (Leeds) > Energy and Resources Research Institute (Leeds)
Identification Number/EthosID: uk.bl.ethos.675530
Depositing User: MR JAMES IKPEME ERETE
Date Deposited: 22 Dec 2015 16:05
Last Modified: 26 Apr 2016 15:44
URI: http://etheses.whiterose.ac.uk/id/eprint/11491

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