PLIF investigation of the evolution of premixed turbulent flame structures
Planar Laser Induced Fluorescence (PLIF) technique of OH has been used to investigate premixed turbulent flame structures under moderate and intense isotropic turbulence. The goal is to test and verify theoretical assumptions regarding classification of premixed turbulent flames. The experiments use a weak-swirl burner that supports stable combustion in laminar and turbulent flames with incident turbulence intensities exceeding 20%. OH-PLIF results obtained for a flame with Ka = 0.8 (i.e. corrugated flamelet regime) show that the flame forms deep flame cusps but not flame pockets. For a flame with Ka = 3.1 (i.e. distributed reaction zone regime), the flame front is more fragmented with pockets form both in the products and in the reactants. Sharp rises in the OH fluorescence intensity profiles deduced from both flames suggest flamelet behavior even for conditions well within the regime of {open_quotes}distributed reaction zones{close_quotes}.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 245647
- Report Number(s):
- LBL--38460; CONF-9603137--3; ON: DE96011517
- Country of Publication:
- United States
- Language:
- English
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