OP-II-3

PP-I-6other reasons for SAT appearance were also put forward [8]. Thus, the problemarises of the feasible appearance of SAT in the absence of molecular transfer ofsubstance and energy upon, e.g., spontaneous ignition of a combustible mixture. Thepresent work reports results of numerical studies on the processes of spontaneousignition and spreading of the flames of the rich dimethyl ether/air (СН 3 ОСН 3 /air)mixtures at constant pressure and volume [9-10].It was concluded them that in the processes of spontaneous ignition, a dominatingreason of SAT formation is the kinetic competition of the groups of fast and slowchemical reactions. In flames, under temperature and concentration gradient conditionsfor the participants of the chemical transformation, additional contribution to SAT can bemade by the diffusion of intermediates to the low-temperature zone, and, first of all, thediffusion of H atoms. It is shown that the formation of SAT is possible not only in “hot” butalso in “cold” hydrocarbon flames [9-10].The novel data on SAT are of importance both in understanding and predictingthe laminar flame propagation limits and in estimating the fire and explosion dangerof “cold” flames. They are useful for the analysis of some processes of chemicaltechnology, e.g., for production of syngas and hydrogen, and allow one to answer thequestion about the systems and conditions in which the formation of SAT is eitherprobable or hardly probable.References[1]. V.S. Babkin, I. Wierzba, G.A. Karim, Chem. Eng. J. 91 (2003) 279.[2]. А.А. Rozlovsky, Dokl. АN SSSR 186 (1969) 373-376 (in Russian).[3]. F. Liu, H. Guo, G. Smallwood, O. Gulder, Proc. Combust. Inst. 29 (2002) 1543-1550.[4]. V.V. Zamashchikov, I.G. Namyatov, V.A. Bunev, V.S. Babkin, Combustion, Explosion and ShockWaves 40 (2004) 32-35.[5]. V.A. Bunev, V.V. Zamashchikov, I.G. Namyatov, V.S. Babkin. Goreniye I Plazmokhimiya.2005, 3,No. 1, p. 1-14 (in Russian).[6]. F. Liu, O.L. Gulder, Combust. Flame143 (2005) 264-281.[7]. V.A. Bunev, V.S. Babkin, Combustion, Explosion and Shock Waves 42 (2006) 503-508.[8]. F. Liu, O. Gulder. Combust. Sci. Technol. 180 (2008) 437-452.[9]. V.A. Bunev, V.S. Babkin, Mendeleev Commun. 107 (2009) 290-291.[10]. V.A. Bunev, Ekologicheskaya Khimiya 16 (2007) 107-124 (in Russian).230