杆件倾角对复合点阵夹芯结构主动换热性能的影响

对具有内热源的复合材料点阵夹芯结构的流体流动和热传输特性进行了数值研究,采用等效热网络法和以结构槽道高度为度量的无量纲参数分别对结构的热源热场和主动换热性能进行了分析和表征,揭示了流体流动及热源温度对芯体杆件倾角变化的响应,给出了一定热流密度下倾角与热源最高温度之间的函数关系,并对基于倾角的结构热/力性能进行了初步的优化分析。结果表明,该复合材料点阵夹芯结构具有优异的主动换热特性,且随着杆件倾角的增大,结构的换热效率提高,结构最高温度降低。

Effect of inclination angle on active cooling performance of composite sandwich structure with lattice truss cores

A numerical study on fluid flow characteristics and heat transfer performance of composite lattice truss core sandwich structure with a constant localized internal heat source was presented. The thermal resistance network and the non-dimensional parameters measured by the channel height were respectively adopted to analysis and characterize the thermal field of heat source and active cooling performance. The effects of inclination angle on fluid flow and temperature of heat source were explored. An optimization analysis of thermo-mechanical performance was carried out based on the relationship between inclination angle and the maximum temperature of heat source. The results suggest that this composite sandwich structure has excellent active cooling performance, and with an increase of inclination angle, the heat transfer efficiency is improved, leading to a reduction of structural maximum temperature.