轻气炮汽冷低温靶系统的研制

Development of Overcooling-steam Cryo-target for Light-gas-gun

直接用低温液体储运杜瓦瓶作为冲击压缩实验液氮靶的冷源 ,通过调节外部加热电压 ,控制瓶底安装的加热元件的功率 ,从而调节氮过冷蒸汽的流量 ,与液氮直接冷却相比 ,过冷汽靶具有操作安全 ,靶体经受的热冲击小 ,冷却效果均匀的特点。调节样品室的气压和冷却速度能够清晰地观测到样品物相的变化。为准确测量低温物态方程 ,扩大冲击压缩实验的范围提供了可靠的技术平台。给出了液态CO2 样品的实验结果。

By using a store and transport steel vessel as cool source for shockcompressing experimental taret which contained liquid nitrogen directly ,and by regulating heating voltage of the heater set at the bottom of the vessel ,the flow of supercooling nitrogen steam could be adjusted conveniently.Comparing with the method of direct cooling by liquid nitrogen,the target is much safer for operating ,bearing small heat shock and higher efficientt of cooling.with asimulation target based on the principle ,the phase transition of specimen could be observed more clearly at normal stste.Thus provided here the technical platform to measure cryo substantial equation of state more precisely and also the shock experimental range is expanded.Meanwhile ,the problems such as preparing of cryo electic probe,scheme of experiment and development of simulation target etc were discussed ,The results of experiment for liquid CO 2 were givn.