Chemical closure and burning rates in premixed turbulent flames
- Cornell Univ., Ithaca, NY (United States). School of Mechanical and Aerospace Engineering
- Sandia National Labs., Livermore, CA (United States)
Chemical closure for premixed turbulent flames is considered, and with a small number of assumptions regarding its form, a model expression for the mean rate of product formation is obtained: w = C[sub p]c(1 [minus] c) to fourth order in (c [minus] 1/2), with C[sub p] a proportionality factor. Any model regardless of its physical and chemical basis should give this result if the aforementioned assumptions are satisfied. The burning rate integral, B[sub T], is introduced, and a relationship between B[sub T] and C[sub p] is developed: B[sub T] = C[sub p]l[sub B] where l[sub B] is a measure of the flame thickness. It follows that measurements of B[sub T] can be used to find C[sub p], and that measurements of this type for a broad range of conditions can provide an empirical closure for w good to fourth order in (c [minus] 1/2). A method for measuring B[sub T] based on a control volume analysis and the use of conditional mean velocities is proposed and demonstrated with data from Miles. The model expression for w is specialized to the flamelet regime of turbulent combustion, and the result obtained is similar to the Bray, Moss, Champion and Libby crossing density model expression. A clear physical interpretation for C[sub p] valid for the flamelet regime, is offered.
- OSTI ID:
- 6537872
- Report Number(s):
- CONF-940711-; CODEN: CBFMAO
- Journal Information:
- Combustion and Flame; (United States), Vol. 100:1-2; Conference: 25. international symposium on combustion, Irvine, CA (United States), 31 Jul - 5 Aug 1994; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FLAMES
MATHEMATICAL MODELS
COMBUSTION KINETICS
COMBUSTION PRODUCTS
FOSSIL FUELS
GAS FURNACES
GAS TURBINES
SPARK IGNITION ENGINES
TURBULENT FLOW
CHEMICAL REACTION KINETICS
ENERGY SOURCES
ENGINES
EQUIPMENT
FLUID FLOW
FUELS
FURNACES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KINETICS
MACHINERY
REACTION KINETICS
TURBINES
TURBOMACHINERY
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry