Module 5: Premixed Flame
  Lecture 27: Flame Stabilization
 


The Borghi Diagram

Borghi Diagram

  • The plot of Da against on a log-log scale
  • Depicts various regimes of turbulent flames

(Figure 27.1)

Weak turbulent flame

  • Upper region of the Borghi diagram

Wrinkled laminar flame

  • Region between and
  • Chemical reaction takes place in a thin zone

Flamelets in eddies

  • Region between upper bold line and

Distributed reaction regime

  • Region below
  • Reaction sheets are distributed in the turbulent flame surface
  • This type of combustion can be established in a well stirred reactor.