空间多层打孔隔热材料热分析数值方法研究

分析了空间多层打孔隔热材料中导热和辐射换热的复合传热问题,建立了关于反射屏的能量方程。结合有限差分法,提出了空间多层打孔隔热材料反射屏瞬态温度计算的模型以及内部辐射数值分析模型,空间环境作为整个模拟中的一个屏,使模型的边界条件方便处理。将该模型的预测结果与文献中相似工况下的预测值和实验值进行比较,说明了该模型在工程中应用的可行性。另一算例的计算结果说明了空间多层打孔隔热材料的瞬态温度、漏热热流变化特点以及反射屏温度分布特点。该模型为多层打孔隔热材料热结构性能研究以及优化设计提供了理论基础。

Numerical Model Study of Thermal Analysis on Multilayer Perforated Insulation Material in Orbit

The combined radiation and conduction heat transfer in multilayer perforated insulation material MLPIM in orbit were investigated.The energy equation of the reflective screen was established.Combining the finite differential method the model for transient temperature calculation of the reflective screens in MLPIM and the model of inner radiation were presented.The space environment was looked as a screen in the whole model,which was convenient to deal with the boundary condition.Comparing the calculational result with the model to the calculational and experimental result in the reference at the analogical conditions it was proved that the model was feasible to apply in the engineering.The calculational result in another example shows the characteristics of the transient temperature and heat flux of the MLPIM in orbit and the characteristics of the temperature distribution of the reflective screens.This model provides the theoretical basis for the thermal performance study and optimum design of perforated multilayer insulation material.