Numerical modeling of 1D heterogeneous combustion in porous media under free convection taking into account dependence of permeability on porosity

All-Russian conference on Nonlinear Waves: Theory and New Applications

Lutsenko, N.A.^1,2

Institute of Automation and Control Processes FEB RAS, Vladivostok

690041, Russia^1

Far Eastern Federal University, Vladivostok

690950, Russia^2

关键词: Combustion waves;    Combustion zones;    Heterogeneous combustion;    Implicit finite-difference schemes;    Numerical experiments;    Object boundaries;    Speed increasing;    Unsteady process;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/722/1/012025/pdf
DOI  :  10.1088/1742-6596/722/1/012025

来源: IOP

【 摘 要 】

Using numerical experiment the one-dimensional unsteady process of heterogeneous combustion in porous object under free convection is considered when the dependence of permeability on porosity is taken into account. The combustion is due to exothermic reaction between the fuel in the solid porous medium and oxidizer contained in the gas flowing through the porous object. In the present work the process is considered under natural convection, i.e. when the flow rate and velocity of the gas at the inlet to the porous objects are unknown, but the gas pressure at object boundaries is known. The influence of changing of permeability due to the changing of porosity on the solution is investigated using original numerical method, which is based on a combination of explicit and implicit finite-difference schemes. It was shown that taking into account the dependence of permeability on porosity, which is described by some known equations, can significantly change the solution in one-dimensional case. The changing of permeability due to the changing of porosity leads to the speed increasing of both cocurrent and the countercurrent combustion waves, and to the temperature increasing in the combustion zone of countercurrent combustion wave.