- Author
-
Tien, J. S.
- Title
- Diffusion Flame Extinction at Small Stretch Rates: The Mechanism of Radiative Loss.
- Coporate
- Case Western Reserve Univ., Cleveland, OH
- Journal
-
Combustion and Flame,
Vol. 65,
No. 1,
31-34,
July 1986
- Sponsor
- National Science Foundation, Washington, DC
- Contract
- GRANT-MEA-8115339
- Book or Conf
- Combustion Institute/Eastern States Section. Chemical and Physical Processes in Combustion. Fall Technical Meeting, 1985. November 4-6, 1985,
Philadelphia, PA,
72/1-72/4 p.,
['1985', '1986']
- Keywords
-
diffusion flames
- Abstract
- A theoretical analysis of diffusion flames extinction in the stagnation point region of a condensed fuel has been made including radiative heat loss from the fuel surface. In addition to the blowoff limit normally found when flame stretch rate is large, a new extinction limit has been identified when the flame stretch rate becomes sufficiently small. This limit occurs as a result of flame temperature reduction when the rate of radiative loss becomes substantial compared with the rate of combustion heat release. A flammability map using oxygen mass fraction and stretch rate as coordinates shows that the extinction boundary consists of a blowoff and a radiative extinction branch. The merging point of the two branches defines a fundamental low oxygen flammability limit.