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• W4205552380 abstract "The acoustic feedback mechanisms in an unheated Mach 1.27 under-expanded impinging jet, are investigated using conditional proper orthogonal decomposition (CPOD) of validated Large Eddy Simulation data. The feedback loop consists of downstream convecting structures in the shear-layer that impinge on the ground, resulting in upstream propagating acoustic waves, that establish an aeroacoustic resonance producing intense impinging tones. Of interest here, is the acoustic receptivity process at the nozzle exit and the impingement mechanism at the plate, both of which feature the critical interchange of acoustic and hydrodynamic energy in the feedback loop. CPOD provides a new tool to study these processes by conditionally selecting receptivity or impingement events and producing space-time mode sequences ranked by energy, thus facilitating the understanding of the unsteady cause and effect dynamics. To further isolate the upstream and downstream dynamics of the feedback loop, the CPOD analysis uses data from the fluctuating stagnation enthalpy decomposed into its hydrodynamic, thermal, and acoustic components. The behavior of the receptivity CPOD modes is correlated to the arrival of acoustic feedback waves outside the jet, but also reveals a delayed feedback arrival inside the jet. Further analysis also reveals the impingement and sound production mechanisms that reinforce different azimuthal modes around the jet." @default.
• W4205552380 created "2022-01-26" @default.
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• W4205552380 date "2022-01-03" @default.
• W4205552380 modified "2023-10-18" @default.
• W4205552380 title "Feedback Mechanisms in a Supersonic Impinging Jet using Conditional Proper Orthogonal Decomposition" @default.
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• W4205552380 doi "https://doi.org/10.2514/6.2022-1153" @default.
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