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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。
In order to analyze the external temperature field of the frozen pellets, ANSYS software was used to analyze the heat transfer of the hollow hollow microsphere targets. The geometrical and physical model of unit heat transfer was established. The microspheres of the target were uniformly distributed in space. The calculation area consisted of three concentric spherical shells, which were the liquid layer, the capsule shell and the helium layer. The thickness of the helium layer was spherical shell Layer thickness of 7 times. The left and right borders of the model are set as adiabatic boundary conditions. The grid is automatically and intelligently divided. The parameter is set to 3 and the cell type is triangular. The simulation shows that when the target temperature is 24 K, the internal temperature gradient of the target is 14.02 K / cm, so that the external temperature field applied is 7.758 K / cm. The calculated values are compared with the existing experimental results. The simulation results are in good agreement with the experimental values (8.2 K / cm).