THEORY OF INFLUENCE OF FUEL PYROLYSIS ON SOOT SHELL STANDOFF RATIOS IN REDUCED-GRAVITY DROPLET COMBUSTION

Soot shell standoff ratios in reduced-gravity droplet combustion are investigated analytically. Analysis of energy conservation shows that temperature gradients between the droplet and a flame, which influence thermophoretic soot transport, are affected by variations in specific heats as well as fue...

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Published inCombustion science and technology Vol. 177; no. 10; pp. 1939 - 1959
Main Authors SHAW, B. D., DAKKA, S. M.
Format Journal Article
LanguageEnglish
Published London Taylor & Francis Group 01.10.2005
Taylor & Francis
Subjects
Applied sciences
Combustion of liquid fuels
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
liquid droplets
microgravity flame phenomena
soot
Theoretical studies. Data and constants. Metering
Pyrolysis
Soot
liquid droplets
Theoretical study
microgravity flame phenomena
Combustion
Droplet
Heptane
Microgravity
Thermophoresis
Temperature gradient
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Summary:Soot shell standoff ratios in reduced-gravity droplet combustion are investigated analytically. Analysis of energy conservation shows that temperature gradients between the droplet and a flame, which influence thermophoretic soot transport, are affected by variations in specific heats as well as fuel pyrolysis. Analyses suggest the onset of fuel pyrolysis can be abrupt, leading to local increases in temperature gradients. These temperature gradient changes can be large enough to influence soot shell formation. Estimates indicate that soot shell standoff ratios will increase as droplets decrease in size, which is in agreement with available experimental results for combustion of n-heptane droplets in reduced gravity.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0010-2202
1563-521X
DOI:10.1080/00102200590970339