Characterization of the density fluctuations in turbulent V-shaped premixed flames

Journal Article · Sun Jun 01 04:00:00 EDT 1986 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(86)90147-1· OSTI ID:5187073

Namazian, M; Shepard, I G; Talbot, L

Rayleigh scattering has been used to measure simultaneously two-point density fluctuations in a range of turbulent premixed flames. V-shaped ethylene/air and methane/air flames stabilized on a 1mm rod were studied at equivalence ratios of 0.6 and 0.8 with approach flow mean velocities of 5 m/s and 7 m/s and turbulent intensities of 5% and 8%. Measurements were performed at different locations downstream of the flame holder. To characterize the flames, the measured flame brush thickness and the rms of the density fluctuations are compared. Time and length scales and other statistical quantities associated with the density fluctuations are reported. The Bray-Moss-Libby model of premixed turbulent combustion has recently been extended to include such characteristics of the scalar field as time and length scales, autocorrelations, and power spectra.

• Research Organization: Acurex Corp., 555 Clyde Avenue, Mountain View, CA 94042
• OSTI ID: 5187073
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 64:3; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AIR
ALKANES
ALKENES
COHERENT SCATTERING
DENSITY
DIMENSIONS
ETHYLENE
FLAME PROPAGATION
FLAMES
FLOW RATE
FLUCTUATIONS
FLUIDS
GASES
HYDROCARBONS
LENGTH
MATHEMATICAL MODELS
MATHEMATICS
METHANE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
RAYLEIGH SCATTERING
SCATTERING
STATISTICS
THICKNESS
TIME DEPENDENCE
TURBULENCE
VARIATIONS