轻质点阵夹芯结构主动换热性能影响因素分析

摘要

针对点阵夹芯结构换热性能影响因素问题,采用翅片法推导四面体型点阵结构等热流密度和等壁面温度边界条件下的努塞尔数,以此表征结构的换热性能,并与实验结果进行对比.进而讨论结构支杆长度、支杆直径、导热系数和流动方向单胞个数对结构换热性能的影响,并比较相同孔隙率下四面体型、金字塔型和Kagome型点阵结构的换热性能.结果表明,点阵结构支杆长度和流动方向单胞个数对结构换热性能影响较大,Kagome型结构换热性能明显优于其他两类.%The active heat transfer performance of light-weight sandwich panel with lattice-frame material (LFM) is analyzed based on the fin method,and Nusselt number of LFM under two different heat transfer boundary conditions,constant heat flux and constant temperature applied to the heat sink under steady state conditions,are derived respectively.The predicted results via the present models are compared with the experimental data.Furthermore,the influence factors which impact the active heat transfer performance are discussed,and the active heat transfer performance of Tetrahedral truss,Pyramidal truss and Kagome truss LFMs are investigated under the same porosity.The results reveal that the truss length and the number of cells along flow direction are more important,and the Kagome truss LFM is significantly better than the others.