Large solid rocket motors can be affected by sustained pressure and thrust oscillations during the quasi-steady state. The root cause of this phenomenon is represented by the coupling between the vortices generation, shedding, advection and interaction with the SRM chamber geometry and the acoustic chamber modes excitement, which may act together, in a feedback coupled loop. In the present work, a Q1D model for the simulation of the pressure oscillations in solid rocket motors, named AGAR (Aerodynamically Generated Acoustic Resonance), is described, discussing a new formulation of the Q1D vorticity equation and of the closure terms for modeling the vortex sound generation. The results of the pressure oscillations simulation yielded with the new model formulation are discussed for the P80 solid rocket motor, first stage of the European launcher VEGA. © 2012 by E. Cavallini, V. Ferretti, B. Favini, M. Di Giacinto, F. Serraglia.
Pressure Oscillations Numerical Simulation In Solid Rocket Motors / Cavallini, Enrico; Ferretti, Viviana; Favini, Bernardo; DI GIACINTO, Maurizio; Ferruccio, Serraglia. - ELETTRONICO. - (2012). (Intervento presentato al convegno 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012 tenutosi a Atlanta, GA nel 30 July 2012 through 1 August 2012) [10.2514/6.2012-3824].
Pressure Oscillations Numerical Simulation In Solid Rocket Motors
CAVALLINI, ENRICO;FERRETTI, VIVIANA;FAVINI, Bernardo;DI GIACINTO, Maurizio;
2012
Abstract
Large solid rocket motors can be affected by sustained pressure and thrust oscillations during the quasi-steady state. The root cause of this phenomenon is represented by the coupling between the vortices generation, shedding, advection and interaction with the SRM chamber geometry and the acoustic chamber modes excitement, which may act together, in a feedback coupled loop. In the present work, a Q1D model for the simulation of the pressure oscillations in solid rocket motors, named AGAR (Aerodynamically Generated Acoustic Resonance), is described, discussing a new formulation of the Q1D vorticity equation and of the closure terms for modeling the vortex sound generation. The results of the pressure oscillations simulation yielded with the new model formulation are discussed for the P80 solid rocket motor, first stage of the European launcher VEGA. © 2012 by E. Cavallini, V. Ferretti, B. Favini, M. Di Giacinto, F. Serraglia.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.