一种用于柱面压缩实验并设有两级内翅式换热器冷屏的液氦温区低温靶

A liquid helium temperature target with two-stage internally finned cold shield heat exchanger for cylinder compression experiment

通过低温技术实现物质的高密度状态并进行冲击压缩实验是获得物质高能量密度状态方程的重要途径.本文介绍了一种用于柱面压缩实验的设有两级内翅式换热器冷屏的液氦温区低温靶.该低温靶通过设置两级内翅式换热器冷屏和在低温下可脱落的折叠冷屏结构,实现了液氦的高效存储,成功研制了应用于柱面压缩实验的液氦温区低温靶.在停止外界液氦供给和关闭真空泵的条件下,可获得4.77 K的样品室稳定温度,样品室的降温时间和维持稳定时间均满足柱面压缩实验的要求.本文还介绍了低温靶的结构设计、利用ANSYS Steady-Static Thermal模块对低温靶进行的热分析与实验结果.仿真计算结果与实验结果吻合较好.

The shock compression experiment of specimen at high-energy density state is an important way to get the state equation. The cryogenic technology is commonly used to get the high-energy density state which known as cryogenic target. This paper introduces a new kind of liquid helium cryogenic target for cylinder compression experiment. With two-stage internally finned heat exchanger cold shield and fold cold shield insulation structure, this target realizes the efficient storage of liquid helium and successfully developed the first domestic application in the liquid helium cryogenic target of cylinder compression experiment. The cavity can maintain the minimum temperature 4.77 K and keep stability for 32 min after move away the pump and helium Dewar which meet the requirement of cylinder loading experiment. This paper introduces the structure design of cryogenic target, thermal analysis with ANSYS Steady-Static Thermal module and experimental results of the target. The simulation results agree well with the experimental results.