考虑分布参数不确定的换热器封头结构优化研究

Structure optimization for inlet header of heat exchangerconsidering uncertain distribution parameters

针对换热器封头的性能设计问题,对封头结构变量不确定性分析、Kriging近似模型构建、结构变量优化设计等方面进行了研究,提出了一种考虑分布参数不确定的换热器封头结构优化设计方法。基于对封头结构变量的不确定性来源的分析,建立了结构变量及其分布参数不确定性的表达函数;基于预测区间准则和遗传算法,构建了封头结构变量与流动不均匀度的自适应Kriging近似模型;建立了换热器封头结构优化设计函数,在Isight中实现了以流动不均匀度最低为目标的封头结构变量优化设计,获取了最佳封头结构尺寸。研究结果表明:优化后的封头结构的内部流动更均匀,降低了出口速度的不均匀度,提高了换热效率。

Aiming at the performance design problem of inlet header of heat exchanger,the uncertainty analysis of structural variables,construction of Kriging approximate model,and optimization design of structural variables were studied,a structure optimization design method for inlet header of heat exchanger considering uncertainties of distribution parameters was proposed.The representation functions of uncertain structural variables and their distribution parameters were determined based on uncertainty analysis of inlet header.The adaptive Kriging approximate model between structural variables and flow nonuniformity degree was constructed based on prediction interval criterion and genetic algorithm.The uncertainty optimization design function of inlet header was established.The optimization design of uncertain structural variables was realized aiming at the lowest flow nonuniformity in Isight,and the optimum structure size of inlet header was obtained considering uncertain distribution parameter.The results indicate that the internal flow of the optimized inlet header is more uniform,and the outlet velocity nonuniformity is reduced,which can improve the thermal efficiency of heat exchanger.