摘要
热防护材料烧蚀过程是一个典型的非线性、不连续问题。近场动力学理论采用空间积分方程代替偏微分方程,能自然地描述烧蚀面的移动而不需要引入其他临界条件和数值方法。提出了只考虑接触近邻的热键模型,推导了改进的近场动力学瞬态热传导理论,引入烧蚀损伤模型,能够简单准确地捕捉热流,实现了对烧蚀过程的描述。最后对方法的准确性和有效性进行了验证,数值结果与文献中的理论结果和实验结果吻合很好。
The ablation process of thermal protective composites is a nonlinear and discontinuous issue. In the peridynamic formulation,the partial differential equations are replaced with integral-differential equations that allow for autonomous evolution of the moving surface and no additional criteria and numerical techniques are needed to be enforced. A new thermal-bond only existing between the particle and its contact neighbor was proposed to capture the heat flow easily. The modified transient heat transfer theory was developed and the surface damage model was introduced. Thus,it is able to easily deal with surface ablation. Numerical simulations have been carried out to verify the accuracy and effectiveness of the proposed method. Numerical results were found to match well with theoretical results and the experimental results respectively.
出处
《科学技术与工程》
北大核心
2017年第26期172-176,共5页
Science Technology and Engineering
基金
中央高校基本科研基金(WUT:2016IVA070)资助
关键词
烧蚀
近场动力学
热键
瞬态热传导理论
烧蚀率
温度场分布
ablation peridynamics thermal bonds transient heat transfer ablation rate tem-perature distribution
