Jet noise: a perspective on recent developments and future directions

Philip Morris

Jet noise predictions can be made based on empirical correlations, methods combining RANS CFD and an acoustic analogy, or by numerical simulation. To make predictions for new designs, only the latter two approaches are viable. Recent predictions based on the RANS-based methods have shown some promise, though they are very limited in the range of conditions that have been considered. These approaches are described and differences between them are highlighted. How these methods fit into the concept of jet noise generation by two source mechanisms (fine scale and large scale) is addressed. They are also contrasted with ideas based on wavepacket models of noise generation by large scale turbulent structures. Noise predictions based on direct simulation, sometimes coupled with a wave extrapolation method, offer a wealth of information. How this database can be used to identify noise source mechanisms as well provide guidance for noise reduction is discussed.

Mots clés: Jet Noise; Predictions; Noise sources

Domaines: Acoustique [physics.class-ph]

Philip Morris. Jet noise: a perspective on recent developments and future directions. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810627⟩