To better estimate the thermal conductivity of solid propellants

the molecular dynamics method was adopted to match the size distribution and volume fraction of solid propellants.The finite element method was employed to compute the steady heat conduction of solid propellant meso-scale models.According to the homogenization method

the mean temperature and mean heat flux were calculated.Based on the mean temperature

mean heat flux and steady heat conduction equation

the effective thermal conductivities of two- and three-phase solid propellants were obtained.The error between the simulation result and test data of two-phase solid propellants is only 3.63%. The results show that the effects of particle size and random distribution of particles can be fully considered when the particle packing model is employed in the process of estimating the thermal conductivity of solid propellants. The particle packing model is more consistent with the micro-structural features of real solid propellant

and the results are accurate and reliable.