反热传导法参数对界面传热系数求解精度的影响  

Influence of Parameters on Accuracy of Interface Heat Transfer Coefficient in Invers Heat Conduction Method

作　　者：刘阔 廖敦明[1] 陈宇豪 甘恬 金煜俊 邹鑫锐 袁贝[1] 顾建华 Liu Kuo;Liao Dunming;Chen Yuhao;Gan Tian;Jin Yujun;Zou Xinrui;Yuan Bei;Gu Jianhua(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology;Guangdong Hongtu(Nantong)Mould Co.,Ltd.)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074 [2]广东鸿图(南通)模具有限公司

出　　处：《特种铸造及有色合金》2023年第9期1210-1216,共7页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2020YFB2008300-2);广东省重点领域研发计划资助项目(2019B090921001)。

摘　　要：基于反热传导法建立了熔模铸型界面传热系数的一维反算模型。采用先假定界面传热系数以计算温度场,将计算得到的温度场作为已知条件代入反求的方法,验证了反算模型的准确性。为提高界面传热系数的求解精度,讨论分析模型中未来时间步数r、正传热中的时间步长Δt等参数对求解结果的影响。结果表明,反算误差主要来自计算初期假定值与实际值的偏离以及传热系数在局部特征区域的复杂变化所引起的求解精度误差。减小r可增强局部特征区域的反算准确性,间接影响整体反算精度;增大r可减弱反算初期计算值与实际值的偏离幅度;Δt主要影响反算精度的临界值,适当减小Δt可以在整体上提高反算精度。Based on the inverse heat conduction method,a one-dimensional inverse calculation model of heat transfer coefficient of investment mold interface was established.By assuming the interfacial heat transfer coefficient to calculate the temperature field,which was substituted as the known condition,the accuracy of inverse calculation model was verified.In order to improve the solution accuracy of interface heat transfer coefficient,the influence of future time step r in analysis model and time step At in the positive heat transfer on the solution results was discussed.The results indicate that the inverse calculation error mainly comes from the deviation between assumed and actual value at the initial stage of calculation and the solution accuracy error caused by the complex change of heat transfer coefficient in the local feature area.The decrease of r can enhance the accuracy of local feature areas and indirectly affect the overall accuracy of inverse calculation.Increase of r can weaken the deviation between calculated and actual value at the initial stage of inverse calculation.Δtmainly affects the critical value of inverse calculation accuracy,and appropriate reduction of Δt can improve the inverse calculation accuracy on the whole.

关 键 词：界面传热系数 数值模拟 反热传导法 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论] O242[自动化与计算机技术—计算机科学与技术] TG249.5[理学—计算数学]