Résumé
Self-excited acoustic oscillations on an experimental swirled burner are studied both numerically and experimentally. Inlet acoustic impedance is measured experimentally and the sensibility of cavity acoustic mode frequencies to the inlet and outlet boundary conditions is investigated numerically by the use of an Helmholtz solver. Strong effect of the inlet impedance is observed on the frequencies of the acoustic cavity modes, and have to be taken into account for futures compressible LES.