Abstract
The paper describes experimental investigation of hydrodynamic instabilities in lean hydrogen-air mixtures. The shock tube of 138 × 138 mm square section was used to experimentally study of evolution of flames in lean hydrogen-air mixtures. Obtained data demonstrate how flame development depends on the Rayleigh-Taylor instability in conditions of the superimposed artificial G-field.
Two modes of turbulent flame development are identified, i.e., convex and concave flames. Modes depend on the mixture concentration. Transition between modes takes place in the 16 ± 2% range of hydrogen concentration in the air. The convex flame mode is realized below the 16% hydrogen concentration in the air, and the concave flame mode is realized above the 16% hydrogen concentration. The 16% hydrogen concentration realizes the transition mode of the periodic oscillating flame. The flame development in the transition mode is driven by the Rayleigh-Taylor instability as far as superposition of the artificial G-field sharply intensifies development of the instability that preconditions the flame evolution in this mode.
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Reference
B.E. Geldfand, M.V. Silnikov, S.P. Medvedev, S.V. Khomik, Thermo-and Gas-Dynamics of Hydrogen Burning and Explosion (St. Petersburg University, St. Petersburg, 2009). (in Russian)
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Anikin, N.B., Simonenko, V.A., Pavlenko, A.V., Tiaktev, A.A., Bugaenko, I.L., Piskunov, Y.A. (2019). Effect of Hydrodynamic Instabilities on the Development of Hydrogen-Air Flames. In: Sasoh, A., Aoki, T., Katayama, M. (eds) 31st International Symposium on Shock Waves 1. ISSW 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-91020-8_29
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DOI: https://doi.org/10.1007/978-3-319-91020-8_29
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