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针对液氮冻结过程中存在温度场分布不均匀的现象,采取在供液铜管上分段打孔及改变打孔方式和位置的方法,设计了四种供液管改进方案,并对这四种方案进行了模拟实验,分别分析其冻结温度场的均匀性和冻土发展速度,同时将改进方案与传统供液方式进行对比。结果表明,改进方案优于传统方案;四种方案中尤以方案三的效果最好,其管壁温度分布最均匀,冻土发展均衡且发展速度较快,液氮消耗量较少。这一研究结果为进一步解决液氮冻结均匀性问题提供了新思路。
In view of the phenomenon of uneven distribution of temperature field in the liquid nitrogen freezing process, four methods for improving the liquid supply pipe are designed by drilling holes on the liquid copper pipe and changing the punching pattern and position. The simulation experiments were carried out to analyze the uniformity of the freezing temperature field and the development of frozen soil respectively. At the same time, the improved scheme was compared with the traditional method of liquid supply. The results show that the improved scheme is superior to the traditional scheme. Among the four schemes, the third scheme is the best, with the most uniform temperature distribution in the pipe wall, the balanced development of frozen soil and rapid development, and the less liquid nitrogen consumption. The results of this study provide a new idea for further solving the problem of liquid nitrogen freezing uniformity.