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Entropy-patch choked-nozzle interaction: quasi-steady-modeling-regime limits probed

  • 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 appreciablydifferent 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 theIndirect 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 appreciablydifferent 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.zeige mehrzeige weniger

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  • Kowalski2024 Proceedings Entropy Patch Choked Nozzle Interactions.pdf
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Autor*innen:Kurt Kowalski, S.J. Hulshoff, P. Ströer, J. Withag, A. Genot, A.S. Morgans, Friedrich BakeORCiD, K. Venner, M.P.J. Sanders, Lionel Hirschberg
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):30th AIAA/CEAS Aeroacoustics Conference (2024)
Jahr der Erstveröffentlichung:2024
Organisationseinheit der BAM:8 Zerstörungsfreie Prüfung
8 Zerstörungsfreie Prüfung / 8.4 Akustische und elektromagnetische Verfahren
Herausgeber (Institution):American Institute of Aeronautics and Astronautics (AIAA)
Erste Seite:1
Letzte Seite:23
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik
Freie Schlagwörter:Entropy Noise; Entropy-Nozzle Interaction; Indirect Combustion Noise
Themenfelder/Aktivitätsfelder der BAM:Energie
Energie / Wasserstoff
Veranstaltung:30th AIAA/CEAS Aeroacoustics Conference (2024)
Veranstaltungsort:Rome, Italy
Beginndatum der Veranstaltung:04.06.2024
Enddatum der Veranstaltung:07.06.2024
DOI:10.2514/6.2024-3113
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:10.06.2024
Referierte Publikation:Nein
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