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气凝胶填充金属蜂窝夹层结构隔热性能试验与模拟

Tests and Simulation of Thermal Insulation Performance for Aerogel-filled Metal Honeycomb Sandwich Structures
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摘要 在1300℃温度和30 min保温时间的条件下,使用Nb基钎料对铌合金进行钎焊来成形铌合金蜂窝。对铌合金蜂窝与气凝胶填充铌合金蜂窝进行加热试验,测定了热面与冷面的瞬态温度。在与实际试验条件基本保持一致的情况下,建立了金属蜂窝与气凝胶填充金属蜂窝的有限元模型,并对不同几何参数的蜂窝进行传热模拟,分析了蜂窝芯格壁厚、芯体高度、芯格内径对隔热性能的影响,并以此总结出蜂窝的隔热机理。研究结果表明:气凝胶可有效地提高蜂窝隔热性能;芯格壁厚越小,芯体高度越大,蜂窝隔热性能越好;填充气凝胶时,芯格内径越大隔热性能越好,蜂窝芯空腔时,芯格内径越大,隔热性能越差。 Niobium alloy honeycombs were formed by brazing a Nb-based brazing material to a niobium alloy at a temperature of 1300°C and a holding time of 30 min.Heating tests were carried out on the niobium alloy honeycomb and the aerogel-filled niobium alloy honeycomb,and the transient temperatures of the hot and cold surfaces were determined.A finite element model of the metal honeycomb and the aerogel-filled metal honeycomb was developed in general agreement with the actual test conditions,and heat transfer simulations were carried out for the honeycomb with different geometrical parameters,the influences of core lattice wall thickness,core height and core inner diameter on thermal insulation performance were analyzed,and then the heat insulation mechanism of the honeycomb was summarized.The results show that aerogel may effectively improve the thermal insulation performance of honeycomb;the thinner the core lattice wall thickness and the higher the core height,the better the thermal insulation performance of honeycomb;the larger the inner diameter of core when filled with aerogel,the better the thermal insulation performance,and the larger the inner diameter of core when the honeycomb core is empty,the worse the thermal insulation performance.
作者 文彦臻 邓云华 贾震 WEN Yanzhen;DENG Yunhua;JIA Zhen(College of Aerospace Engineering,Shenyang Aerospace University,Shenyang,110136;Aeronautical Key Laboratory for Welding and Joining Technologies,AVIC Manufacturing Technology Institute,Beijing,100024)
出处 《中国机械工程》 EI CAS CSCD 北大核心 2023年第5期556-562,共7页 China Mechanical Engineering
基金 航空科学基金(2018ZE54028) 航空制造工艺数字化国防重点学科实验室开放基金(SHSYS202005) 辽宁省教育厅科学基金(JYT2020005)。
关键词 铌合金蜂窝 气凝胶填充 有限元模型 几何参数 隔热机理 niobium alloy honeycomb filled aerogel finite element model geometric parameter heat insulation mechanism
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