【摘要】 介绍了活性蓄冷器的基本模型,并对该模型采用Lach理论以Mikusinski运算积分的方法进行求解,得到了活性蓄冷器温度分布的半解析解.在设定相同精度的条件下与数值解比较发现,半解析解计算所需的节点数较少,并且速度较快,同效性很好.利用理想磁制冷材料和典型磁性材料钆,得到了活性蓄冷器的运行特性.通过对无量纲量传热单元数和流体与磁性材料的热容比进行分析,得到了活性蓄冷器各运行参数和磁性材料磁性参数对活性蓄冷器的影响规律.结果表明,对金属钆,制冷量随温跨的增大而减小,随温度区间整体向低处移动而减小.更多还原

【Abstract】 A basic model of active magnetic regenerator (AMR) was described, and the model was solved according to Lach theory adopting Mikusinski operational calculus method. The semi-analytical solution about the temperature profile in AMR was derived. Compared with numerical solution under the same setting accuracy, the semi-analytical solution needs fewer nodes, computes more quickly and is equivalent to the numerical solution. With ideal magnetic material and typical room temperature magnetic material Gadolinium, the operational characteristics of AMR were figured. On the basis of analysis of the dimensionless number of transfer units and heat capacity ratio, the influence of operational parameters and magnetic parameter of magnetic material on the performance of AMR was analyzed. The results show that for Gadolinium, the cooling capacity decreases when the cooling temperature span increases or the temperature range moves toward low temperature.更多还原