Mathematical modeling of pressure oscillation in the combustion chambers of solid rocket motors

Numerical simulation of the flow instability and pressure self-oscillations for complex configurations of solid fuel charges in the combustion chamber are carried out. Calculation of the combustion products in combustion chamber was carried out with constant mass inflow in two-phase Navier-Stokes equations for a compressible medium. Large-eddy simulations (LES) turbulent model are implemented to study the oscillation flow field. According to fast Fourier transform the spectrum of pressure oscillations in the combustion chamber is determine. It is shown that the complex geometry of solid fuel charge can lead to the occurrence of low- frequency oscillations in the range of natural frequencies of the combustion chamber