散热结构拓扑优化目标函数适用性讨论

Design Objectives of Heat Channel Layout Optimization

工程实际中存在不同的散热需求,合理选择散热性能描述指标,是实现散热结构最优设计的关键。以密度法为基础,针对典型的均匀生热及非均匀生热工况,分别以散热弱度、算术平均温度、几何平均温度、温度梯度及温度标准差五种散热结构拓扑优化目标函数进行计算。通过比较最优结构中的平均温度、最高温度、温度梯度、温度标准差和散热弱度等温度特征指标,总结得出各目标函数对不同工况的适用性,以便在实际工程应用时,在高导热材料给定的条件下,快速准确地选择出具有针对性的目标函数,设计出符合实际工程要求的散热效果最佳的散热通道。

There are various design requirements of heat structures in practical engineerings,and choosing right design objective of the heat dissipation is the key element for realizing the heat channel layout optimization.Based on the density method,heat transfer structures are optimized by 5kinds of design objectives,including dissipation of heat transport potential capacity,average temperature,geometry average temperature,the temperature gradient and temperature standard deviation.By comparing the average temperature,the maximum temperature,the temperature gradient,temperature standard deviation and dissipation of heat transport potential capacity with the design results respectively,the rules for the choosing of design objective to different conditions are obtained.So in practical applications,when the high heat conduction material is constant,the optimal objective function can be chosen accurately and quickly.