Numerical studies have been carried out to examine the radiation effects on ignition delay and flame spread in solid rocket motors with uniform and non-uniform port geometry. Parametric analytical studies have been carried out using 2d transient, double precision, pressure-based, species, SST k-omega turbulence model. In the numerical study, a fully implicit finite volume scheme of the compressible Navier-Stokes equations is employed. As a part of the code validation and calibration, the numerically predicted boundary-layer blockage at the Sanal flow choking condition for channel flows is verified using the closed-form analytical model of V.R. Sanal Kumar et al. (AIP Advances, 8, 025315, 2018) and found excellent agreement with the exact solution. Detailed studies have been carried out to examine the influence of port geometry on the surface heat flux distribution, with and without radiation effects. We observed through the parametric studies that the radiation effect is having more significant effect in SRMs with non-uniform port geometry than uniform port cases with respect to its ignition delay and overall flame spread interval. The numerical results presented in this paper is useful for the ignition transient studies of high performance solid propellant rocket motors with non-uniform port geometry.
展开▼
