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Instabilities in Gaseous Combustion

  • Nickolai M. RubtsovEmail author
Chapter
Part of the Heat and Mass Transfer book series (HMT)

Abstract

By means of high-speed color cinematography, it was shown that the flames in lean Н2–air mixtures at an initial stage propagate symmetrically and the flame radius can be estimated from the frames of speed filming. It is shown that sufficiently strict calculation of cellular structure of the flame front of lean hydrogen mixtures requires consideration of a 3D problem, however, thermal diffusion instabilities at the initial stage of combustion have no effect on the velocity of flame which can be estimated assuming unperturbed flame front in the range of  8%<H2<15%. It was shown that the analysis of experimental data on flame propagation in lean mixtures does not allow taking apart the results of calculation by two-dimensional model with regard to convection and without convection. It was experimentally shown, that isobutene additives in quantities below a concentration limit (up to 1.5 %) tend to increase, and СО2 additives up to 15 %—to reduce the flame propagation velocity in lean Н2–air mixtures. The reasons for the acceleration of combustion in the presence of hydrocarbon additive are considered. The method of high-speed cinematography was used in investigation of transition of spherical flame front to flat front in n-pentane–air and methane–air mixtures initiated by a spark discharge. Cellular flame structures were observed in the transition. Modeling based on compressible reactive Navier–Stokes equations at low Mach number showed qualitative agreement with experiment. Features of combustion in flame cells caused by hydrodynamic instability are experimentally established. It was shown that each flame cell represents a separate “chemical reactor”; in the cell, the process of complete chemical transformation occurs. It was shown that inhomogeneities detected in light emission that arise after contact of a flame front with the walls of cylindrical reactor can be correlated with the occurrence of acoustic waves by the example of combustion of hydrogen–air mixtures containing 30 and 15 % of hydrogen. It was revealed that flame velocities in stoichiometric hydrogen–air mixtures at central spark initiation do not depend on the material of inner reactor surface but on its shape.   

Keywords

Hydrogen Methne n-pentane Spherical flame front Flat Instabilities Thermal diffusion Hydrodynamic Acoustic Compressible reactive Navier-Stokes equations Low Mach number Flame cells 

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Russian Academy of SciencesInstitute of Structural Macrokinetics and Materials ScienceMoscowRussia

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