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科学通报  2014 

对流和辐射边界条件下轧钢加热炉壁绝热层(火积)构形优化

DOI: 10.1360/csb2014-59-15-1417, PP. 1417-1422

Keywords: 构形理论,(火积)耗散率,对流传热,对流与辐射复合传热,平板绝热层,广义热力学优化

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Abstract:

基于绝热过程(火积)耗散极值原理，以(火积)耗散率最小为优化目标，在对流传热和辐射传热边界条件下，对轧钢加热炉壁平板绝热层进行构形优化，得到平板绝热层的最优构形.结果表明对流传热边界条件时，(火积)耗散率最小的绝热层最优构形与热损失率最小的绝热层最优构形是明显不同的.(火积)耗散率最小的绝热层最优构形与热损失率最小的绝热层最优构形相比，(火积)耗散率降低了5.98%，从而使得其整体绝热性能得到提高.对流与辐射复合传热边界条件时，绝热层厚度线性增大的布置方式与等厚度绝热层和厚度线性减小的布置方式相比，绝热层(火积)耗散率分别降低了16.59%和39.72%，从而使得绝热层整体绝热性能大大提高.存在最佳常系数a2，opt使得绝热层无量纲耗散率取得最小值.绝热层最小无量纲(火积)耗散率和最大温度梯度最小值对应的最佳常系数a2，opt相差不大，这使得(火积)耗散率最小的绝热层最优构形对应的热应力也较小，从而在提高绝热层整体绝热性能的同时也有助于提高其热安全性.本文所得结果能从传热优化角度为绝热层的优化设计提供参考.

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