Vortex-sound modelling in aft-finocyl solid rocket motors

This paper has the aim to investigate the correlation between some ballistic geometrical parameters of a SRM and the calibration of AGAR Q1D model of the pressure oscillations. The correlation permits to share the same model calibration between SRMs of different scales prone to pressure during their steady state, improving the prediction capability of the model. The numerical reconstructions performed on two aft-finocyl SRMs, P80 the first stage of the European launch vehicle VEGA, and POD-Y the mid- scale demonstrator for the pressure oscillations of the possible future evolutions of P80 SRM, confirm the effectiveness of this approach and the goodness of the AGAR model, both numerical results being in very good agreement with experimental data.