Nonlinear analysis of an acoustically excited laminar premixed flame

摘要: Abstract The nonlinear effects of the fully coupled two-way interactions between a disturbance field defined by an amplitude variation inflow velocity distribution and laminar premixed flame incorporating gas expansion are investigated numerically solving conservation equations compressible fluid. Results higher harmonics front perturbation for two burnt to unburnt temperature ratios show how transfer response is affected hydrodynamic instability shear layer effect. at fundamental forcing frequency, i.e., flame-describing function can be well predicted reduced-order model (ROM) both low Markstein length values, where balance stretch insignificant. However, high lengths influences characteristics all excitation amplitudes. study indicates that differences in harmonic content overall detailed computation ROM predictions located just before pockets separate. Thus, effect determine character through nonlinearity introduced base, location pocket separation, annihilation process tip especially values. In addition, base movement compared recent developed understand findings with respect assumption attachment burner lips.