Aerothermoacoustics Q1D modeling for solid rocket motors instabilities

A Q1D multiphase model is presented and discussed for the investigation of pressure oscillations within solid rocket motors. Model structure arises from the merging of two in-house Q1D codes addressing separately vortex-shedding issues and aluminum unsteady combustion. In order to validate such methodology, numerical simulations have been performed on several test cases, greatly different from each other, in order to demonstrate model robustness and versatility. The presented solutions are in plain agreement with experimental and literature data concerning pressure oscillations amplitude and instability behavior. Such results ensure the model validation, providing a light but powerful tool to investigate pressure oscillations within solid rocket motors.