Flame propagation in weightlessness above the burning surface of material

Paper number

IAC-18,A2,4,2,x44335

Author

Ms. Veronika Tyurenkova, Russian Federation, Scientific Research Institute for System Analysis, Russian Academy of Sciences (RAS)

Coauthor

Mr. Lyuben Stamov, Russian Federation, Scientific research Institute for System Studies, Russian Academy of Sciences (RAS)

Coauthor

Dr. Valeriy Nikitin, Russian Federation, Moscow Lomonosov State University

Year

2018

Abstract

The condensed fuel burning in an oxidant gas flow occurs in investigations of various processes, for example: burning of fuel in hybrid engines; interaction of hypersonic flying vehicles with the atmosphere; exo- and endothermic reactions in chemical engineering; spreading of flame over the fuel surface, the origination of explosions and the propagation of detonation in unmixed two-phase systems of the gas-film type.
For all of the above processes it is necessary to calculate the heat and mass transfer between a chemically reacting gas layer and a reacting, melting, subliming, or otherwise destructing, surface. The methods of investigations in this field are very complicated, because the motion of a gas is governed not only by force and temperature fields but also by chemical processes depending in turn on velocity and temperature fields. This requires a conjugate solution of dynamic, thermal and diffusional problems with allowance for the equations of chemical kinetics, multi-component diffusion and variability of thermophysical properties of a medium with distributed parameters. The process incorporates the thermochemical destruction of the surface when vapours of fuel substances, comprising the surface material, diffuse into a boundary layer and react chemically with the external flow.
The results of numerical studies of flame propagation in weightlessness above the burning surface of material including unsteady-state transition stage are presented. A mathematical model is developed accounting for the peculiarities of diffusion combustion of fuel in the flow of oxidant, which is composed of oxygen-nitrogen mixture. Three dimensional unsteady-state simulations of chemically reacting gas mixture above thermochemically destructing surface are performed. The results show that the diffusion combustion brings to strongly non-uniform fuel mass regression rate in the flow direction. Diffusive deceleration of chemical reaction brings to the decrease of fuel regression rate in the longitudinal direction.

The present investigation was supported by Presidium RAS, program №27 Fundamental aspects of supercomputing for simulating complex practical problems.

Abstract document

IAC-18,A2,4,2,x44335.brief.pdf

Manuscript document

IAC-18,A2,4,2,x44335.pdf (🔒 authorized access only).

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