Numerical study of laminar conical flame stability with different thermal conditions at the nozzle wall

The paper presents a direct numerical simulation of a laminar premixed methane-air flame using a detailed kinetic mechanism. In this study, the numerical solver laminarSMOKE has been extended by a module for conjugate heat transfer between the flame and nozzle walls. Switching the isothermal boundary condition at the nozzle wall to the conjugated heat transfer condition results in a higher temperature of the nozzle exit edge, a reduction in a gas density gradient near the nozzle exit and a reduction in the low-frequency oscillations of the flame caused by the buoyancy force.