A numerical study of solid-fuel combustion in a chamber

摘要

A numerical analysis was performed to study the turbulent flows in a simulated solid-fuel combustion chamber for a practical fuel blowing velocity of 0.5 m/s. The time-dependent axisymmetric compressible conservation equations were solved directly, without using subgrid-scale turbulence models, and the chemical reaction was assumed to be infinitely fast and to take place in one step. The numerical code used the finite-volume technique and the numerical fluxes across the cell edges were computed using a modified Godunov scheme. The initial states of primitive variables in the Riemann solver of the modified Godunov scheme were obtained by second-order extrapolations from the cell center values, and a new limiting technique was applied to the extrapolated values to reduce numerical oscillation. Two numerical test cases are presented to verify the efficacy of the present method, and then the modified scheme is applied to study the coupling between the chemical reaction and fluid dynamics in a solid-fuel combustor.