摘要
提出了一种将皱褶芯材夹层板与主动冷却相结合的承载-热防护一体化结构形式。以煤油为冷却液,在强迫对流条件下,采用数值仿真方法对V-型和M-型皱褶芯材夹层板的热力响应进行了研究。首先,建立了主动冷却皱褶芯材夹层板的三维流固耦合模型,应用共轭传热数值计算方法,求解获得了冷却液和结构的温度场;采用顺序耦合求解,得到了相应的结构应力场和变形场。结果表明,实施主动冷却后皱褶结构的换热性能明显提高;沿流向温度上升,并呈现周期性波动;结构的皱褶在加强对流换热的同时,也导致了应力集中。芯材胞元拓扑构型及几何尺寸对结构的换热性能和应力应变具有一定程度的影响。与V-型相比,M-型皱褶结构的应力集中现象得到了较大缓解。
A multifunctional sandwich panel with folded cellular cores was proposed for actively cooled load-bearing components in aerospace thermal protection systems. Thermal-mechanical responses of V-type and M-type folded core sandwich panels subjected to forced convection using kerosene as a coolant were studied numerically. First, a 3D fluid-solid coupling model was established and the temperature fields of fluid and structure were computed using the conjugate heat transfer model. Subsequently, the thermal stress and deformation of structure were obtained via sequential coupling method. The results show that the heat transfer performances of folded core sandwich panels are evidently improved through active cooling. The temperature increases along the flow direction and presents a periodic fluctuation. Heat convection is reinforced due to the folds which also cause serious stress concentrations. Cell topology and geometric dimensions have certain influences on the heat transfer characteristics and thermal structural behavior of the active cooled panels. A M-type folded core sandwich panel is superior to a V-type one for a much less severe stress concentration.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2014年第4期545-550,共6页
Journal of Solid Rocket Technology
基金
江苏省普通高校研究生科研创新计划资助项目(CXLX13_163)
中央高校基本科研业务费专项资金资助
江苏高校优势学科建设工程资助项目
关键词
皱褶芯材
主动冷却
热防护
流固耦合
folded core
active cooling
thermal protection
fluid-solid coupling
