Lift-off characteristics of turbulent jet diffusion flames

Conference · Thu Dec 31 23:00:00 EST 1981 · AIAA Pap.; (United States)

OSTI ID:5507484

Peters, N ^[1]; Williams, F A ^[2]

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1. Technische Hochschule, Aachen, West Germany
2. Princeton Univ., NJ

A theoretical analysis of turbulent jet diffusion flames is developed in which the flame is regarded as an ensemble of laminar diffusion flamelets that are highly distorted. The flow inhomogeneities are considered to be sufficiently strong to produce local quenching events for flamelets as a consequence of excessive flame stretch. The condition for flamelet extinction is derived in terms of the instantaneous scalar dissipation rate which is ascribed a lognormal distribution. Percolation theory for a random network of stoichiometric sheets is used to predict quenching thresholds that define lift-off heights. Predictions are shown to be in reasonably satisfactory agreement with experimentally measured lift-off heights of methane jet diffusion flames.

• OSTI ID: 5507484
• Report Number(s): CONF-820106-
• Journal Information: AIAA Pap.; (United States), Journal Name: AIAA Pap.; (United States) Vol. 82-0111; ISSN AAPRA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
COMBUSTION INSTABILITY
DIFFUSION
FLAME PROPAGATION
FLAMES
FLUID FLOW
HYDROCARBONS
INSTABILITY
JETS
LAMINAR FLOW
MATHEMATICS
METHANE
MULTIPHASE FLOW
NUMERICAL ANALYSIS
ORGANIC COMPOUNDS
QUENCHING
STOICHIOMETRY
TURBULENCE
VELOCITY