Surface properties of turbulent premixed propane/air flames at various Lewis numbers

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(93)90144-R· OSTI ID:6342704

Lee, T W; North, G L; Santavicca, D A ^[1]

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1. Pennsylvania State Univ., Univ. Park (United States)

Surface properties of turbulent premixed flames including the wrinkled flame perimeter, fraction of the flame pocket perimeter, flame curvature, and orientation distributions have been measured for propane-air flames at Lewis numbers ranging from 0.98 to 1.86 and u[prime]/S[sub L] = 1.42-5.71. The wrinkled flame perimeter is found to be greater for the thermodiffusively unstable Lewis number (Le < 1) by up to 30% in comparison to the most stable condition (Le = 1.86) tested, while the fraction of the flame pocket perimeter shows a similar tendency to be greater for Le < 1. The flame curvature probability density functions are nearly symmetric with respect to the zero mean at all Lewis numbers throughout the range of u[prime]/S[sub L] tested, and show a much stronger dependence on the turbulence condition than on the Lewis number. Similarly, the flame orientation distributions show a trend from anisotropy toward a more uniform distribution with increasing u[prime]/S[sub L] at a similar rate for all Lewis numbers. Thus, for turbulent premixed propane/air flames for a practical range of Lewis number from 0.98 to 1.86, the effect of Lewis number is primarily to affect the flame structures and thereby flame surface areas and flame pocket areas, while the flame curvature and orientation statistics are essentially determined by the turbulence properties.

• OSTI ID: 6342704
• Journal Information: Combustion and Flame; (United States), Vol. 93:4; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
03 NATURAL GAS
FLAMES
SURFACE PROPERTIES
PROPANE
COMBUSTION KINETICS
AIR
LAMINAR FLOW
MIXTURES
MORPHOLOGY
ORIENTATION
SHAPE
SURFACE AREA
TURBULENCE
TURBULENT FLOW
ALKANES
CHEMICAL REACTION KINETICS
DISPERSIONS
FLUID FLOW
FLUIDS
GASES
HYDROCARBONS
KINETICS
ORGANIC COMPOUNDS
REACTION KINETICS
400800* - Combustion
Pyrolysis
&amp; High-Temperature Chemistry
034000 - Natural Gas- Combustion