Perturbations of the flame structure due to a thermocouple. II. Modeling

• Published in: Combustion, explosion, and shock waves Vol. 47; no. 4; pp. 414 - 425
• Main Authors: Skovorodko, P. A., Tereshchenko, A. G., Paletsky, A. A., Knyaz’kov, D. A., Korobeinichev, O. P.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.07.2011
• Subjects: Chemical reactions; Classical and Continuum Physics; Classical Mechanics; Control; Dynamical Systems; Engineering; Flame structure; Mathematical analysis; Mathematical models; Methane; Navier-Stokes equations; Perturbation methods; Physical Chemistry; Physics; Physics and Astronomy; Thermocouples; Vibration; thermocouple; overheating; RDX; temperature; methane; flame structure; Navier-Stokes equations
• ISSN: 0010-5082; 1573-8345
• DOI: 10.1134/S0010508211040046

Flame perturbations caused by the presence of a thermocouple have been studied by modeling the external flow of a reactive gas mixture around a thermocouple using the complete system of unsteady Navier-Stokes equations modified to approximately account for the effect of heat release due to chemical reactions. The modeling was performed for a methane gas flame and for the flame of a condensed system exemplified by RDX under the experimental conditions described in the literature. It is found that the deceleration of the flow in the vicinity of the thermocouple leads to a local increase of heat due to chemical reactions and the corresponding increase in temperature relative to the thermocouple unperturbed value. This effect has not been previously discussed in the literature.