On the discrepancy in the reaction rate descriptions of turbulent premixed combustion in porous media at different scales

A numerical study on the turbulent combustion in the porous media is conducted based on 2D staggered cylinders with the eddy dissipation concept model (EDC). The numerical results show that a discrepancy exists between the reaction rate descriptions of turbulent premixed combustion at different scales. For a quasi-steady case, the microscopic and macroscopic descriptions agree well with each other. However, during the rebalance process, this equilibrium state is difficult to reach under the lean fuel and higher velocity conditions, so the macroscopic method shows remarkable fluctuation, a step change even appears at the throat position. How to relate the two methods in a reasonable way is still an open subject. (C) 2015 Published by Elsevier Ltd.