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PremixedTurbulentFlameEPME525SP2011

PremixedTurbulentFlameEPME525SP2011 - 1 Premixed Turbulent...

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1 Premixed Turbulent Flame Example Problem ME 525 SP 2011 Prof. Lucht (E-mail address: [email protected]) A turbulent premixed flame is stabilized in a diverging rectangular channel. The channel height 0 ( ) 1 2 / h x h x L , the channel length 4 L m , and the channel width w is constant. The incoming flow has a low turbulence level but a turbulence generating grid is placed very close to the inlet. The turbulence grid induces significant turbulent fluctuations, v 0.25 v rms , and the ratio of the rms velocity fluctuation to the mean velocity, v /v rms , remains constant downstream of the grid. The laminar flame speed is given by 2 0.34 1.4 1.08 /sec L S m   for propane-air mixtures, and the turbulent flame speed is given by
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