Low amplitude but sustained pressure and thrust oscillations can characterize the quasi-steady condition of solid rocket motor; notwithstanding they are not threatening for motor life, coupling to the structural modes, they can damage the payload. These oscillations are due to fluidynamics instabilities and acoustic coupling. In this paper the AGAR (Aerodynamically Generated Acoustic Resonance) code is presented, a simplified method to predict both oscillation frequencies and amplitude with reduced computational costs and times, describing the excitation of acoustic modes accounting for the acoustic feedback on the vortex shedding phenomenon. A brief description of the method and of the principal obtained numerical results is presented.
Q1D Modeling of SRM Aeroacoustics / Ferretti, Viviana; Favini, Bernardo; Cavallini, Enrico; DI GIACINTO, Maurizio; Serraglia, F.. - (2010). (Intervento presentato al convegno Space Propulsion 2010 tenutosi a San Sebastian, Spain nel 3 - 6 May 2010).
Q1D Modeling of SRM Aeroacoustics
FERRETTI, VIVIANA;FAVINI, Bernardo;CAVALLINI, ENRICO;DI GIACINTO, Maurizio;
2010
Abstract
Low amplitude but sustained pressure and thrust oscillations can characterize the quasi-steady condition of solid rocket motor; notwithstanding they are not threatening for motor life, coupling to the structural modes, they can damage the payload. These oscillations are due to fluidynamics instabilities and acoustic coupling. In this paper the AGAR (Aerodynamically Generated Acoustic Resonance) code is presented, a simplified method to predict both oscillation frequencies and amplitude with reduced computational costs and times, describing the excitation of acoustic modes accounting for the acoustic feedback on the vortex shedding phenomenon. A brief description of the method and of the principal obtained numerical results is presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
