Temperature / soot volume fraction correlations in the fuel-rich region of buoyant turbulent diffusion flames

Instantaneous soot volume fractions and temperatures were measured in the fuel-rich (underfire) region of turbulent nonpremixed acetylene, propylene, ethylene, and propane flames burning in still air. Large-scale, highly buoyant, pool-like flames were considered, having characteristic residence time...

Full description

Saved in:
Bibliographic Details
Published in:Combustion and flame 1990-08, Vol.81 (2), p.150-165
Main Authors: Sivathanu, Y.R., Faeth, G.M.
Format: Article
Language:English
Subjects:
03 NATURAL GAS
034000 > Natural Gas-- Combustion
ACETYLENE
ALKANES
ALKENES
ALKYNES
Applied sciences
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMBUSTION PRODUCTS
Combustion. Flame
diffusion
Energy
Energy. Thermal use of fuels
ETHYLENE
Exact sciences and technology
FLAMES
HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
KINETICS
ORGANIC COMPOUNDS
PROPANE
PROPYLENE
REACTION KINETICS 400800 > Combustion, Pyrolysis, & High-Temperature Chemistry
SOOT
TEMPERATURE MEASUREMENT
Theoretical studies. Data and constants. Metering
turbulent flow
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Instantaneous soot volume fractions and temperatures were measured in the fuel-rich (underfire) region of turbulent nonpremixed acetylene, propylene, ethylene, and propane flames burning in still air. Large-scale, highly buoyant, pool-like flames were considered, having characteristic residence times greater than 250 ms and burner exit Richardson numbers greater than 18. Measurements were made using an optical probe than involved laser extinction for soot volume fractions and two-wavelength pyrometry for temperatures. Strong correlations were found between soot volume fractions and temperatures for each fuel-relatively independent burner operating conditions and position in the underfire region. This behavior is supportive of the existence of nearly universal relationships between soot volume and mixture fractions in the underfire region of turbulent nonpremixed flames having large characteristic residence times. Underfire soot is largely confined to a narrow range of mixture fractions (yielding a soot spike) and temperatures. The latter observation supports approximations of constant-temperature soot layers that have been proposed in teh past for estimates of continuum radiation from soot-containing diffusion flames.
ISSN:0010-2180
1556-2921
DOI:10.1016/0010-2180(90)90061-U