关键词: 轴编C/C复合材料；烧蚀实验；代表性体积单元；温度周期性边界条件；气体-颗粒两相流；细观尺度

Abstract: The working environment of the four-directional carbon/carbon(C/C)composites for throat in solid rocket motor is confronted with high-temperature， high-pressure， high-speed， ablation and erosion of a large amount of gas-particle two-phase flow， which is very strict on the ablation resistance and thermal structural characteristics of the 4D C/C composites. Therefore， based on experiment of ablation and thermal structure characteristic， thermal structure properties prediction and simulation of gas-particle two-phase flow， the research progress of ablation and thermal structure characteristic of the 4D C/C composites is discussed. This paper gives that the control of the ablation parameters and simulating real ablation working environment are the difficulties of ablation experiment. The working condition under the addition of aluminum particles and measurement experiment of thermal structure properties based on mesoscale are the emphasises in experiment. It is proposed to conduct ablation experiments from the type of specimen， the design of the experimental program， and the comparison aluminum particles for two conditions. The thermal stability material was used to replace the interface in the experiment of thermal structural characteristic. The influence of the interface between the component materials on the thermal structure properties prediction based on mesoscale is the difficulty to simulate. The representative volume element on the basis of the periodic boundary conditions of temperature to predict the thermal structure properties is proposed. In the simulation of gas-particle two-phase flow， the coupling of different phases in the engine and the erosion mechanical of the 4D C/C composites are difficulties in numerical simulation. The SDPH-FVM coupling method is proposed to solve the flow field. The problem of combustion flow can be further used to reveal the combustion mechanism of the flow field.

Key words: Four-directional carbon/carbon composites；Ablation experiment；Representative volume element；Periodic boundary conditions of temperature；Gas-particle two-phase flow；Mesoscale