自然对流散热齿的拓扑优化

Topology Optimization of the Natural Convection Fin Heat Sink

采用基于密度的自然对流拓扑优化方法,对三维自然对流散热齿进行了优化设计。采用插值参数渐进方案,并以优化前的散热齿形状作为设计变量的初始分布。拓扑优化得到了在靠近齿片端部处打孔的设计方案,热源平均温度较优化前显著降低。采用阈值过滤提取拓扑优化后的齿片形状,数值模拟结果显示,与原来的无孔散热齿相比,打孔散热齿的热阻降低15%,齿片体积减少5%。打孔虽然削弱了齿片的导热,但强化了齿片与空气的对流。在拓扑优化给出的孔位置和孔尺寸下,对流强化的收益超过导热恶化的损失,综合效果为散热齿散热能力提高,热源平均温度降低。

The density-based topology optimization(TO)method is employed to the thermal optimization design of a three-dimensional natural convection fin heat sink.A parameter advancing scheme is adopted,and the shape of the original heat sink is used as the initial distribution of the design variable.TO predicts a new design where there are holes near the ends of fins,of which the average temperature of the heat source is significantly lower than that before optimization.Use the threshold technique to extract the optimized fin shape,numerical simulation results demonstrate that compared to the original non-hole design,the deign with holes reduces the thermal resistance by 15%,and the fin volume by 5%.Although the holes weaken the heat conduction of the fins,they enhance the heat convection with air.Under the condition of the topology-optimized hole location and hole size,the gain of convection enhancement exceeds the loss of heat conduction deterioration.As a result,the heat dissipation capability of the heat sink is improved and the average temperature of the heat source decreases.