Figure 6. Sequences of video images of spatial development of the flame front for P = 1 atm, the numbers in each frame correspond to a consecutive number of the video image: a - spark initiated ignition in 40% H₂ + 60% air at the temperature of reactor walls 20 C; 600 shots s^–1; P = 1 atm; the material of the wall is stainless steel; b - 40% H₂ + 60% air mixture at the reactor wall temperature of 247 C; Pt foil is placed in the stainless steel reactor. It is clearly seen in the shot 3; c - the heating of Pt wire (J=2А). The wire is lighted with a vertical green laser sheet, 60 frames/s; d - 40% H₂ + 60% air mixture at the reactor wall temperature of 316 C; Pt wire is placed in the stainless steel reactor. It is clearly seen in shots 1, 61. As is seen from shots 1, 61, Pt wire is heated before and after the explosion due to catalytic reactions; e - 85% (40% H₂ + 60% air mixture) + 15% CO₂ at the reactor wall temperature of 320 C; f - 85% (40% H₂ + 60% air mixture) + 15% He at the reactor wall temperature of 309 C; Pt wire is placed in the stainless steel reactor. It is clearly seen in shots 1, 61. As is seen from shots 1, 62, Pt wire is heated before and after the explosion due to catalytic reactions; g - The dynamics of an increase in the radius R of the flame fronts estimated from the data of Figure 6: experiments a; d; e. P₀ = 1 atm, 600 frames/s.

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Identification of the Features of the Unstable Flame Propagation by 4D Optical Spectroscopy and Color Speed Cinematography

N Rubtsov, A Kalinin, A Vinogradov, A Rodionov, K Troshin, G Tsvetkov, V Chernysh

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