The acoustic and entropy transfer functions of quasi-one-dimensional nozzles are studied
analytically for both subsonic and choked flows with and without shock waves. The present …

Analytical and numerical assessments of the indirect noise generated through a nozzle are
presented. The configuration corresponds to an experiment achieved at DLR by Bake et …

Two mechanisms control sound generated by combustion in gas turbines: direct combustion
noise in which acoustic waves generated by the flame propagate from the combustion …

The propagation of acoustic, entropy and vorticity waves through turbine stages is of
significant interest in the field of core noise. In particular, entropy spots have been shown to …

A method to predict combustion noise in real aero-engines using Large Eddy Simulations
(LES) of the combustion chamber coupled with an analytical approach to model the acoustic …

Prediction of Acoustic Modes in Combustors using Linearized Navier-Stokes Equations in
Frequency Space Page 1 Technische Universität München Institut für Energietechnik Lehrstuhl …

Combustion noise has recently been the subject of attention of both the aeroacoustic and
the combustion research communities. Over the last decades, engine manufacturershave …

Annular ducts with axial cross-sectional surface area gradient are typical elements in aero-
engines and land-use gas turbines. Acoustic, entropy and vorticity waves propagating in …

A hybrid methodology combining a detailed Large Eddy Simulation of a combustion
chamber sector, an analytical propagation model of the extracted acoustic and entropy …

Noise emissions are a major issue for aircraft and engines manufacturers due to the
proximity of airports to residential zones and mostly as international regulations are …