Abstract
Premixed flame propagation of methane-air mixuture in a closed vessel is estimated through the direct numerical simulatinon of three dimensional unsteady Navier-Stokes equations. In order to deal with the strong density and temperature variation across the flame, the extended version of the MAC method is employed as a numerical method. The chemical reaction is assumed to be an irreversible single step reaction between methane and oxygen. The chemical species are CH4, O2, N2, CO2 and H2O.
The simulation reproduces the transformation into a tulip flame during the flame propagation, and the results are agreed with experimental results. Especially, it is verified that the flame-flow interaction causes the flame transformation process. This work implies the possibility of the direct numerical simulation of the three dimensional flame propagation in the future.
