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1.
V. V. Azatyan N. M. Rubtsov G. I. Tsvetkov V. I. Chernysh 《Kinetics and Catalysis》2006,47(3):327-332
The interaction of hydrogen atoms with a variety of alkali metal and alkaline-earth metal salts results not only in the recombination of these atoms but also in the displacement, into the gas phase, of free radicals (CaCl·(A 1 P 1/2, B 2 S +) and CaF·(A 2 P)) and metal atoms, including their excited species, which are detected spectroscopically. Transmission spectra indicate that the NaCl surface undergoes metallization when treated with a high-frequency discharge and a rarefied hydrogen flame. Combustion is affected by the gas-phase hydrogen atoms involved in the chain reaction and by the varying composition and properties of the surface. The concentration of Na atoms over the NaCl surface at 770 K is 109?1011 cm?3 in a stream of H atoms at 1 Torr and in the 2H2 + O2 flame at 4 Torr. The concentration of sodium atoms in the 2 P 3/2 and 2 P 1/2 excited states is ~5 × 106?5 × 108 cm?3. The role of the discovered reactions in combustion, pyrolysis, and plasma chemistry is discussed. 相似文献
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Azatyan V. V. Alymov M. I. Prokopenko V. M. Abramov S. K. Kazanskii V. B. 《Kinetics and Catalysis》2022,63(4):412-417
Kinetics and Catalysis - The kinetic characteristics of propagating flame were shown to depend on the chemical properties of the contacting solid surface and on the rates of heterogeneous... 相似文献
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It is shown that the characteristic time of the hydrogen-oxygen reaction without the participation of reaction chains is thousands of times longer than the characteristic time of heat removal from the reactor under third self-ignition limit conditions. As a result, reaction mixture self-heating does not exceed several degrees and, contrary to commonly accepted views, cannot cause thermal ignition. It is also shown that the reason for self-ignition under these conditions is the excess rate of chain branching compared with chain termination responsible for the formation of chain avalanches. For the same reason, layer-by-layer ignition during laminar flame propagation is also a chain process. Self-heating arises as a result of the development of chain combustion and strengthens chain avalanches. Explosion and detonation inhibition shows that chain avalanches play an important role in these processes. 相似文献
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S. K. Abramov V. V. Azatyan G. R. Baimuratova I. A. Bolod’yan V. Yu. Navtsenya D. N. Sokolov A. Yu. Shebeko Yu. N. Shebeko 《Russian Journal of Physical Chemistry B, Focus on Physics》2010,4(6):923-927
The combustion of hydrogen-air mixtures near the lower composition flammability limit in cylindrical reactors of various diameters
is studied. The speed of flame propagation in the horizontal direction is lower than that in the upward direction. Chromatographic
analysis showed that, during the combustion of these mixtures, hydrogen is consumed only partially. That the flame propagates
despite a low adiabatic temperature can be explained by the formation of the well-known cellular structure. 相似文献
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V. V. Azatyan V. M. Prokopenko S. K. Abramov N. N. Smirnov 《Doklady Physical Chemistry》2017,472(1):13-15
It was experimentally shown that the reaction of the combustion of hydrogen–air mixtures in a detonation wave virtually completely (with an accuracy of 1%) occurs by a branched-chain mechanism; it is this mechanism that determines the characteristics of the detonation wave. 相似文献
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V. V. Azatyan 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2014,88(5):747-758
Results of the studies show that the occurrence of chain avalanches is a necessary condition of gasphase processes of combustion not only at pressures tens of times lower than atmospheric pressure, as was thought earlier, but at almost any higher pressures in any temperature regime. It is concluded that considering the specifics of nonisothermal chain processes over a broad range of pressures allows us to explain and adequately describe observed features of combustion, explosion, and detonation (including some that were unexplained earlier). New laws important in theory and practice are predicted and revealed. 相似文献
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V. V. Azatyan I. A. Bolod’yan V. Yu. Navtsenya A. Yu. Shebeko Yu. N. Shebeko 《Kinetics and Catalysis》2011,52(5):637-646
Kinetic aspects of controlling ignition and flame propagation parameters in the gas phase by chemical methods are considered.
The efficiency of the chemical methods is due to the branched chain character of gas-phase combustion reactions and the dominant
role of the competition between chain branching and chain termination in these processes. 相似文献