Analysis on heat transfer performance of honeycomb sandwich structure with side wall openings
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摘要:
针对侧壁开孔蜂窝夹芯结构，建立了蜂窝单元高温辐射-导热耦合传热模型，采用有限元方法分析了内部传热机制，获得了其高温等效导热系数。讨论了开孔形状、开孔参数、孔排布形式等结构参数对等效导热系数的影响，拟合得到了等效导热系数的计算关联式。研究表明：开孔形状对蜂窝单元等效导热系数几乎无影响；等效导热系数随孔隙率增大而减小，受开孔数影响较小。并联开孔相对于串联开孔时等效导热系数更低，孔隙率14%、孔数为4时等效导热系数比串联时小8.4%，相较于未开孔时降低16.1%。
Abstract:Targeting the new honeycomb sandwich structure with holes on the sidewall, the coupled heat transfer model of high temperature radiation-heat conduction of honeycomb unit was established. The internal heat transfer mechanism was analyzed by using the finite element method, and the high temperature equivalent thermal conductivity was obtained. The effects of structural parameters, such as hole shape, hole parameters and hole arrangement on equivalent thermal conductivity were discussed, and the calculation correlation of equivalent thermal conductivity was obtained by fitting. Studies showed that the hole shape had little effect on the equivalent thermal conductivity of honeycomb cells. The equivalent thermal conductivity decreased with the increase of porosity, which was less affected by the number of holes. The equivalent thermal conductivity of parallel holes was lower than that of series holes. When the porosity was 14% and the number of holes was 4, the equivalent thermal conductivity was 8.4% smaller than that of series holes, 16.1% lower than that without holes.
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图 2 蜂窝单元等效导热系数随上表面温度变化曲线
Figure 2. Variation of the equivalent thermal conductivity of the honeycomb cell with the temperature of the upper surface
图 3 开孔形状对蜂窝单元等效导热系数的影响
Figure 3. Effect of hole shape on equivalent thermal conductivity of honeycomb unit
图 4 孔隙率与开孔数对等效导热系数的影响
Figure 4. Effect of porosity and number of openings on equivalent thermal conductivity
图 5 孔排布形式对等效导热系数的影响
Figure 5. Effect of hole arrangement on equivalent thermal conductivity
图 6 侧壁串联开孔蜂窝结构等效导热系数拟合示意图
Figure 6. Schematic of the fitted equivalent thermal conductivity of the honeycomb structure with tandem openings in the side walls
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