In this paper,the heat matching and ablative matching of thermal protective layer and antenna cover plate were studied.The influence of size effect on heat matching of antenna window and thermal protective layer were analyzed by finite element method,and the ablation matching behavior was verified by conversion electric drive air running tes.t The results show that:the 20 mm×20 mm test pieces even without installation clearance the maximum thermal stress of the thermal insulation layer is about 2.98 MPa,which is less than the tensile strength of the low den-sity quartz phenolic acid composite material at high temperature,thus there is no heat matching risk.When the size of antenna is larger than 60 mm,the local thermal stress of anti-thermal ex-pansion is about 5.3 MPa,which is larger than the tensile strength of thermal protective layer,and there is a risk of local swelling and cracking of anti-thermal layer.However,in the actual in-stallation process,an installation clearance of 0.3 mm is reserved between the antenna cover plate and the thermal protective layer,the maximum expansion of antenna cover plate at high tempera-ture is only 0.03～0.04 mm,is less than the gap value,so there is no heat matching risk.Due to its high temperature resistance,the antenna cover plate basically has no ablation at high tempera-ture,and the thermal protective layerr ablation is about 1.1 mm,therefore,steps can be reserved at leading edge of the antenna cover plate in the subsequent design to reduce the risk of ablation matching under high temperature.
关键词
天线盖板/热匹配/有限元分析
Key words
Antenna cover/Thermal matching/Finite element analysis
维普
万方数据