冰箱中空气流场和温度场的有限元模拟

Simulation of Air Flow and Temperature Field inside a Refrigerated Chamber with Finite Element Method

使用有限元程序ＦＩＤＡＰ７．６，在Ｋａｒｌｓｒｕｈｅ大学的ＩＢＭ／６０００ＳＰ并行计算机上，对冰箱内部的二维稳态空气流场进行了模拟，研究了热负荷、冰箱内部搁板与蒸发器及门之间的间距、内部搁板的导热系数对箱内温度分布与流场的影响．实验结果表明，二维稳态模型能够反映不同参数对冰箱内部温度场与流场的影响．

In order to know the influences of difference parameters on the air flow and temperature field in a refrigerator and to optimize the field, two dimensional static air flow and temperature distribution are simulated with the finite element software FIDAP7.6 run on the parallel computer IBM/6000SP of Karlsruhe University. The influences of heat loads, the distances between the fittings and the evaporator and the door, respectively, as well as the heat conductivity of the fittings on the temperature field and the air flow field are investigated. The reliability of the theoretical model is proved by the experiments. It is shown that the two dimensional static model can reflect the influences of many different parameters on the temperature field and by that also the air flow field. When the heat load increases, the thickness of the boundary layer will decrease and the temperature differences along the height will increase. When the distances between the fittings and the evaporator and the door respectively increase, the air convection will be strengthened and the temperature differences between different parts inside the refrigerator will also increase. The heat conductivity of the fittings has little influence on the temperature field and the air flow field under normal working conditions of the refrigerator.