Numerical Simulation of the Oscillations in a Mixer - An Internal Aeroacoustic Feedback System
The space-time conservation element and solution element method is employed to numerically study the acoustic feedback system in a high temperature, high speed wind tunnel mixer. The computation captures the self-sustained feedback loop between reflecting Mach waves and the shear layer. This feedback loop results in violent instabilities that are suspected of causing damage to some tunnel components. The computed frequency is in good agreement with the available experimental data. The physical phenomena are explained based on the numerical results.
KeywordsWind Tunnel Shear Layer Nozzle Throat Shock Cell Mach Wave
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