Etude expérimentale d'un régime de combustion dilué dans une configuration à contre-courant

Abstract : A new combustion regime, able to reduce the nitric oxide formation is studied. A flame is stabilised between two preheated jets of diluted reactants, injected separately in a counter-flow burner. An experimental device was built, which enables the stretch rate, the turbulent intensity, the preheating temperature and the dilution with nitrogen of the reactants to be varied. The aerothermochemical characterisation is carried out using PIV, and spontaneous emission charting of OH* and CH* radicals. Specific algorithms were developed to process the digital pictures, and to extract the coordinates of the reactive zones. The influence of the parameters on the combustion regime has been measured. The domain of flammability grows with increasing temperature and turbulence intensity, and shrinks with the dilution. These observations have been linked to the thickness of the chemically active layers. Turbulence increases species transport, and, when the reactive species are preheated, strengthens the flame against extinction. Increase of temperature and turbulence leads to homogenisation of the spatial properties of both the flame and the flow.
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Electric power. Université de Poitiers, 2006. French


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Submitted on : Thursday, February 1, 2007 - 11:45:22 AM
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Philipp Bauer. Etude expérimentale d'un régime de combustion dilué dans une configuration à contre-courant. Electric power. Université de Poitiers, 2006. French. <tel-00128440>

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