ICF空心微球靶传热的有限元分析

 为分析冷冻靶丸外部温度场，应用ANSYS软件对ICF空心微球靶的热传递进行了有限元分析。建立了单元传热的几何物理模型，靶丸微球呈空间均匀分布，计算区域由三个同心球壳组成，分别为液体层、靶丸壳层以及氦气层，氦气层厚度为球壳层厚度的7倍。模型左右两边界设为绝热边界条件，采用智能自动划分网格,设定参数为3，单元类型为三角形。模拟表明，在靶丸工作温度为24 K的情况下，为保持靶丸气泡受力平衡，自洽得到靶丸内部温度梯度为14.02 K/cm，以此求解出所施加的外部温度场为7.758 K/cm。将计算值与现有的实验结果进行了比较，模拟结果与国外实验值(8.2 K/cm)吻合得较好。

Finite element analysis of heat transfer in hollow micro-sphere filled with ICF fuel

In order to analyze the far-field temperature gradient,a finite element analysis(FEA) of the heat transfer in hollow micro-sphere filled with ICF fuel was made,providing the border adiabatic,meshing the model intellectualizedly,and supposing the parameter as 3,the cell as triangle.When the work temperature of the target was 24 K,in order to maintain the balance of the gas bubble in the micro-sphere,the temperature gradient in the target was 14.02 K/cm,The digital simulation result showed that the external temperature gradient was 7.75 K/cm.The result fits well with the data achieved by experiment.This shows the mathematics model is credible,and can be applied in the manufacture of the cryogenic target.