Aerothermochemical analysis of combustion of carbon in the stagnation flow

Journal Article · Tue Jun 01 04:00:00 EDT 1976 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(76)90082-1· OSTI ID:7259544

Tsuji, H; Matsui, K

An aerothermochemical analysis is made of the combustion of solid carbon exposed to the stagnation flow of oxidizing gas, and the effects of the surface Damkoehler number and the oxygen concentration in the oxidizing flow on the combustion rate of solid carbon are examined. A rather high surface temperature of solid carbon (higher than 1500/sup 0/K) and a very high rate of CO oxidation in gas phase are postulated; the heterogeneous reaction is taken as 2C + CO/sub 2/ ..-->.. 2CO, and the homogeneous reaction as 2CO + O/sub 2/ ..-->.. 2CO/sub 2/. The analysis is reduced to a problem of solving a nonlinear second-order ordinary differential equation of energy for various combinations of the gas-phase Damkoehler number and the surface Damkoehler number. The surface reaction is found to have chemically the same effect as the increase of the stoichiometric ratio of gas-phase reaction and gasdynamically the increase of the fuel injection rate, so that the combustion rate of solid carbon is generally expected to be small. For the gas-phase reaction of infinitely high rate, an explicit expression for the relation between the surface Damkoehler number, the oxygen concentration, and the combustion rate can be derived.

• Research Organization: Tokyo Univ.
• OSTI ID: 7259544
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 26:3; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AERODYNAMICS
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION KINETICS
ELEMENTS
FLUID MECHANICS
KINETICS
MECHANICS
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
STAGNATION
SURFACE TREATMENTS
THERMOCHEMICAL PROCESSES
VERY HIGH TEMPERATURE