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

K. Kowalski, S.J. Hulshoff, P. Ströer, Jan Withag, A. Genot, A. S. Morgans, F. Bake, K. Venner, Martinus P.J. Sanders, L. Hirschberg

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientific

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Abstract

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 motors. Moreover, it is believed to be an issue in electrical-power generation turbines and aero-engines. If these flow inhomogeneities are essentially characterized by the fluid having a locally appreciably-different thermodynamic state, the acoustic response engendered by its interaction with the combustion-chamber exit is commonly referred to as entropy noise. In this paper, dedicated numerical-simulation results of entropy-patch choked-nozzle interactions are presented. Two types of entropy patches were considered: rectangular slugs and circular spots. Moreover, analytical-model-based analysis, of said simulation results, is presented. Based on said analysis, the authors posit the existence of three modeling regimes: the quasi-steady-modeling regime, the blended-physical-effects regime, and the inertial-modeling regime.
Original languageEnglish
Title of host publication30th AIAA/CEAS Aeroacoustics Conference (2024)
Number of pages23
Edition30
ISBN (Electronic)978-1-62410-720-7
DOIs
Publication statusPublished - 2024
Event30th AIAA/CEAS Aeroacoustics Conference (2024) - Rome, Italy
Duration: 4 Jun 20247 Jun 2024
Conference number: 30

Publication series

Name30th AIAA/CEAS Aeroacoustics Conference, 2024

Conference

Conference30th AIAA/CEAS Aeroacoustics Conference (2024)
Country/TerritoryItaly
CityRome
Period4/06/247/06/24

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