针对飞机隔热结构中金属筋条的热桥问题,设计了两类典型飞机隔热结构构型.为了研究分析热桥效应对隔热性能的影响,对各构型进行瞬态热传导有限元分析,得到在热面温度分别为100 ℃,200 ℃,300 ℃,424 ℃时考核点的温度,并通过隔热性能实验验证了有限元方法的有效性.结果表明:热桥对隔热结构的隔热性能有较大影响,设计隔热结构时应充分考虑热桥现象;提出了热桥阻断的方法.
Two kinds of typical aircraft insulation structures were designed for the heat bridge in the metal ribs of aircraft insulation structures.In order to study the influence of heat bridge effect on thermal insulation performance,each configuration was analyzed by the transient heat transfer FEA,check point temperature was obtained in the hot surface temperature of 100 ℃,200 ℃,300 ℃,424 ℃ respectively,and the validity of FEA was proved by insulation performance experiment.The result showed that the thermal bridge has a great influence to the insulation performance of insulation structure,and the thermal bridge influence should be considered adequately when the insulation structure designed.Additionally,the blocking method for thermal bridge is also put forward.
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