Coupled Numerical Simulation Study For Non-Equilibrium Flow And Solid Temperature Field Of Carbon-Based Materials Under Ablative Conditions

In the high temperature zone controlled by thermal and chemical non-equilibrium effects, air and ablation protective materials will take place a series of reactions, which will have non-negligible effects on the mass concentration of the various components of the plasma sheath, electron number density, pressure, density, temperature and wall heat, and also have a serious impact to the target radiation and electromagnetic scattering properties, in this sense, it is of utter important for the development of missile penetration and target recognition technology to predict the thermochemical non-equilibrium ablation flow field of reentry warhead.The numerical simulation of thermochemical non-equilibrium ablation flow field not only need to study the calculation method of thermochemical non-equilibrium flow field, but also need to consider the impact of the ablation products, and the calculation of ablation products is closely related to the wall temperature of heat-resistant material. Based on the above analysis, this paper studied successively the following four aspects:the numerical simulation of solid temperature field, the ablation mechanism and engineering algorithm of carbon-based composite material, the numerical simulation of thermochemical non-equilibrium flow field and solid temperature field-ablation-nonequilibrium flow field coupling method.In this paper, solid temperature field numerical simulation software is compiled with heat balance method and is applied to calculate the3D rectangular numerical example, the results show that the calculation error is less than0.4%; The carbon-based composite material ablation calculation software is compiled with engineering algorithm and is applied to calculate the stagnation ablation degradation example, the results show that the calculation error is less than15%; The chemical reaction model of carbon-based composite material ablation and air mixtures is added to the existing thermochemical non-equilibrium numerical simulation software which is applied to calculate the3D spherical cone example, the results show that the software has a very high accuracy.On the basis of the above work, this paper further studies the solid temperature field-ablation-nonequilibrium How field coupled numerical simulation method and coupled the three sets of independent software together to form a complete coupling numerical simulation software of non-equilibrium flow and solid temperature field of carbon-based materials under ablative conditions, and then used this software to calculate a spherical head model under calculation conditions given by myself. The results meet the physical law and chemical law. which proves the accuracy of this coupling numerical simulation software to some extent.