A large-eddy simulation (LES) of a next-generation combustor is performed to examine
effects of this combustor concepts on direct and indirect combustion noise characteristics …

Abstract The Council of European Aerospace Societies (CEAS) Aeroacoustics Specialists
Committee (ASC) supports and promotes the interests of the scientific and industrial …

Composition noise has recently received increasing attention for its potential to contribute
significantly to the indirect noise mechanism. In this study, the importance and definition of …

In this work, we investigate both numerically and theoretically the sound generated by
entropy waves passing through sudden area expansions. This is a canonical configuration …

An experimental cold-gas study of the response of a choked convergent–divergent nozzle to
swirl perturbations is presented. The perturbations were obtained by means of upstream …

ENGINEERING systems employing turbulent combustion usu-ally have high levels of noise
production, due to both direct and indirect combustion-noise sources. Direct sources, due to …

Measurements of sound due to swirl–nozzle interaction are presented. In the experiment a
swirl structure was generated by means of unsteady tangential injection into a steady swirl …

We propose a physical model to predict indirect noise generated by the acceleration of
compositional inhomogeneities in nozzles with viscous dissipation (non-isentropic nozzles) …

Thermoacoustic stability assessment of gas turbine combustors requires an acoustic
impedance boundary condition for the downstream turbomachinery. Actuator disk type …

The downstream acoustic response due to the interaction of main-flow oriented vorticity with
a choked nozzle in a swirl-free flow was experimentally demonstrated. The response was …