[HTML][HTML] Experimental investigations of indirect noise due to modulation of axial vorticity and entropy upstream of a choked nozzle

L Hirschberg, F Bake, K Knobloch, SJ Hulshoff… - Journal of sound and …, 2022 - Elsevier
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 …

Sound production due to Swirl–Nozzle interaction: Model-based analysis of experiments

L Hirschberg, SJ Hulshoff, F Bake - AIAA journal, 2021 - arc.aiaa.org
Indirect noise due to the interaction of flow inhomogeneities with a choked nozzle is an
important cause of combustion instability in solid rocket motors and is believed to be …

Swirl–nozzle interaction experiments: Influence of injection-reservoir pressure and injection time

L Hirschberg, F Bake, K Knobloch, SJ Hulshoff - AIAA journal, 2021 - arc.aiaa.org
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 …

Swirl–nozzle interaction experiment: quasi-steady model-based analysis

L Hirschberg, F Bake, K Knobloch, A Rudolphi… - Experiments in …, 2021 - Springer
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 …

Entropy-Patch-Choked-Nozzle Interaction: Quasi-Steady-Modeling-Regime Limits Probed

K Kowalski, SJ Hulshoff, P Ströer, J Withag… - 30th AIAA/CEAS …, 2024 - arc.aiaa.org
Indirect combustion noise due to the interaction of flow inhomogeneities with a choked
combustion-chamber exit is an important cause of combustion instability in solid rocket …

Entropy-patch choked-nozzle interaction: matching-condition and inertial-effects regimes mapped & preliminary investigations of amplitude effects

K Kowalski - 2024 - essay.utwente.nl
Indirect combustion noise due to the interaction of flow inhomogeneities with a choked
combustion-chamber exit is an important cause of combustion instability in solid rocket …

Main flow oriented vorticity noise experiments

L Hirschberg, F Bake, K Knobloch… - INTER-NOISE and …, 2023 - ingentaconnect.com
Entropy inhomogeneities and vorticity spots induce so-called indirect combustion noise
when passing through a choked nozzle; referred to as entropy noise and vorticity noise …