Combustion noise of unconfined turbulent flames has been investigated using a hybrid CFD/CAA Method. A large-eddy simulation (LES) of a turbulent non-premixed flame is used to determine the source terms for the computational aeroacoustics (CAA) simulation. The governing CAA equations, namely the Acoustic Perturbation Equations (APE), have been extended to take into account noise generated by reacting flow effects. The right-hand side of the pressure-density relation within the APE system shows that the major source term, the heal release per unit volume, is encoded in the density fluctuation. Therefore the total time derivative of the density is used as source term to simulate combustion noise.
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