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A theoretical and experimental study of carbon combustion in stagnation flow

1990; Elsevier BV; Volume: 81; Issue: 2 Linguagem: Inglês

10.1016/0010-2180(90)90062-v

1556-2921

Atsushi Makino,

Combustion and Detonation Processes

The combustion of solid carbon in the stagnation flow of an O2CO2inert gas stream is theoretically and experimentally studied for the quasi-steady situation of constant surface temperature. In the theoretical phase chemical reactions considered include the surface CO2 and CCO2 reactions and the gas-phase COO2 reaction. By using generalized species-enthalpy coupling functions derived without any limit or near-limit behavior, effects of gas-phase Damköhler number, surface Damköhler numbers, surface temperature, CO2 mass fraction in the oxidizer flow, flow configuration, and the incompressibility assumption on the mass burning rate of carbon are investigated. Calculated results emphasize the intimate coupling between the gas-phase and the surface reactions, and the fact that the combustion mechanism is intermediate of those assuming frozen mode and attached or detached flame modes. It is also shown that the density variation in the combustion field exerts a suppressing effect on the mass burning rate in the kinetically controlled regime, while it exerts a promoting effect in the diffusion controlled regime. By using a definite set of kinetic and thermophysical parameters, it is further demonstrated that the theoretical calculations agree well with both existing experimental data as well as those determined in the present study.