Partially premixed turbulent flame propagation in jet flames
- Rheinisch-Westfaelische Technische Hochschule Aachen (Germany). Inst. fuer Technische Mechanik
Flamelet formulations for premixed and non-premixed combustion are combined in order to treat partially premixed combustion in the fast chemistry limit. The flamelet concept for non-premixed combustion is based on the equation for the mixture fraction Z(x,t), while that for premixed combustion uses a field equation for the scalar field G(x,t), whose level surfaces G = G{sub 0} represent the flame surface. The laminar burning velocity appearing in this equation is assumed to depend on the local mixture fraction field Z(x,t) and the scalar dissipation rate {chi}. The formulation is used to determine flame propagation and liftoff heights in turbulent jet diffusion flames of methane. The analysis is viewed as a first step to resolve the previous controversy about the stabilization mechanism--premixed propagation vs diffusion flame quenching--since both effects are found to be important and to influence the liftoff height.
- OSTI ID:
- 93260
- Report Number(s):
- CONF-940711--
- Country of Publication:
- United States
- Language:
- English
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