金属型铸造界面换热系数峰值预测模型的建立和验证  

Development and validation of prediction models of heat transfer coefficient peak value during metal casting process

作　　者：徐戎[1,2] 李落星[1,2] 张立强[1,2] 朱必武[1,2] 卜晓兵[3] 

机构地区：[1]湖南大学汽车车身先进设计与制造国家重点实验室,长沙410082 [2]湖南大学机械与运载工程学院,长沙410082 [3]湖南大学材料科学与工程学院,长沙410082

出　　处：《中国有色金属学报》2014年第4期950-957,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家"十二五"科技支撑计划资助项目(2011BAG03B02);国家自然科学基金面上资助项目(51075132);湖南大学汽车车身先进设计与制造国家重点实验室自主课题资助项目(61075005)

摘　　要：在改进Hamasaiid模型的基础上提出了新的金属型铸造界面换热系数峰值hmax预测模型,该模型引入表面张力参数,定量研究其对界面换热的影响。采用A356铝合金金属型重力铸造实验对模型进行验证。结果表明:反求计算的hmax约为5944 W/(m2·K),采用Hamasaiid模型计算的hmax约为7987 W/(m2·K),误差约为34%;新模型未考虑表面张力时计算的hmax约为6228 W/(m2·K),误差约为5%,考虑表面张力时计算的hmax约为5992W/(m2·K),误差约为1%。新模型计算精度有较大提升,计算结果与反求结果具有很好的一致性,表面张力对计算精度有一定影响。The new predictive model of metal casting interfacial heat transfer coefficient peak value （hmax） was proposed by improving Hamasaiid’s model. The surface tension was introduced into the model, its impact on the interfacial heat transfer was quantitatively studied. A356 aluminum alloy gravity die casting experiments were performed in order to validate the model. The results show that thehmax value calculated by the inverse heat conduction method is about 5944 W/（m^2·K）, the result of Hamasaiid’s model is about 7987 W/（m^2·K）, and the error is about 34%. Thehmax value calculated by the new model is about 6228 W/（m^2·K）, and the error is about 5%, but if the surface tension is considered, the result is about 5992 W/（m^2·K）, and the error is about 1%. The calculation accuracy of the new model was greatly improved, the calculation results are in good agreement with the inverse results. The surface tension has a certain impact on the calculation accuracy.

关 键 词：界面换热系数 金属型重力铸造 表面粗糙度参数 表面张力 接触热阻 反热传导法 

分 类 号：TK124[动力工程及工程热物理—工程热物理]