Premixed Turbulent Combustion in High Reynolds Number Regimes of Thickened Flamelets and Distributed Reactions
Final rept. 15 Mar 2012-14 Mar 2015
MICHIGAN UNIV ANN ARBOR DEPT OF AEROSPACE ENGINEERING
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The physics of turbulent premixed flames, in the range of the high Reynolds numbers that are associated with Air Force applications, was measured for the first time using advanced laser imaging diagnostics. Combustion in three regimes on the Borghi regime diagram of premixed turbulent flames was quantified for the first time, by imaging the thicknesses of preheat and reaction layers. New PLIF diagnostics were developed, due to our interactions with Dr. Cam Carter at AFRL to image reactions zones with a new CH PLIF method, as well as using the overlap method that involves formaldehyde and OH PLIF. Results are used to assess previous theoretical predictions of regime boundaries. PLIF images of CH, OH and formaldehyde were obtained for thirteen cases. The three regimes are a the thickened preheat TP regime that is bounded by the Klimov-Williams limit, b the broken reaction layers BR boundary and the partially-distributed reactions PDR regime. A new Hi-Plot burner provides extremely-turbulent flames which is ten times the turbulence level of previous experiments.
- Physical Chemistry
- Fluid Mechanics
- Combustion and Ignition