摘要
分析不同颗粒冲刷状态下三元乙丙绝热材料炭化层的微观结构,确定炭化层为疏松多孔介质,整体结构为致密/疏松结构。颗粒侵蚀作用分为颗粒机械破坏和颗粒热增量,根据不同冲刷状态炭化层结构形态建立颗粒机械破坏模型;通过实验测试确定颗粒热增量模型。根据气相沉积原理拟合炭化层中致密结构,将颗粒侵蚀模型与考虑炭层孔隙结构的热化学烧蚀模型耦合,计算得到多个工况的炭化烧蚀率与实验结果吻合,且炭化层结构分布与实验得到的电镜结构基本一致。
In this paper,charring layers microstructures of EPDM insulation in different erosion conditions were analyzed,and the charring layers were determined as gas-saturated porous media with dense layer and porous layer.Particle erosion was classified into two groups： mechanical erosion and particle heating increment.Mechanical erosion model was established by analyzing the structure of charring layer under various state parameters of particle erosion,and particle heating increment was obtained by experiment tests.The formation of dense layer inside the charring layer was fit to the theory of CVD.The particle erosion model was coupled with thermo-chemical model considering the porous structure of charring layer.The numerical results for different erosion conditions were found to reasonably agree well with the available experimental data,and the calculate structures of charring layer were almost consistent with the photos of microscope.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2011年第3期349-353,共5页
Journal of Solid Rocket Technology
基金
国家自然科学基金资助项目NSFC(50776073)
(E060405)
国防973项目支持(61371)
