TY - GEN
T1 - Entropy-Patch-Choked-Nozzle Interaction: Quasi-Steady-Modeling-Regime Limits Probed
AU - Kowalski, K.
AU - Hulshoff, S.J.
AU - Ströer, P.
AU - Withag, Jan
AU - Genot, A.
AU - Morgans, A. S.
AU - Bake, F.
AU - Venner, K.
AU - Sanders, Martinus P.J.
AU - Hirschberg, L.
N1 - Conference code: 30
PY - 2024
Y1 - 2024
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85202437244&partnerID=8YFLogxK
U2 - 10.2514/6.2024-3113
DO - 10.2514/6.2024-3113
M3 - Conference contribution
T3 - 30th AIAA/CEAS Aeroacoustics Conference, 2024
BT - 30th AIAA/CEAS Aeroacoustics Conference (2024)
T2 - 30th AIAA/CEAS Aeroacoustics Conference (2024)
Y2 - 4 June 2024 through 7 June 2024
ER -