Premixed Turbulent Combustion in High Reynolds Number Regimes of Thickened Flamelets and Distributed Reactions
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 24, 2016
- Accession Number
- ADA631885
Entities
People
- James F. Driscoll
Organizations
- University of Michigan