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月球样品存储装置主要用于对月球样品进行保存、观察分析等工作。存储装置内部直接放置月球样品,为月球样品提供高纯氮气环境,保证样品不受地球环境污染。为确保存储装置内的水、氧指标满足要求,存储区和外部净化系统之间需建立动态气体循环,而存储装置内部气流扰动会对样品操作产生影响。本文给出了月球样品存储装置组成及三维结构,建立了存储区分析计算的模型,利用Tetra/Mixed法建立了四面体网格,对比计算了不同氮气循环接口布局对内部流场的影响,计算结果表明,下进下出接口可有效降低内部流场扰动。研制的月球样品存储装置内部环境水、氧指标均优于0.1×10~(-6),满足月样存储要求。
Lunar sample storage device is mainly used for the lunar sample preservation, observation and analysis work. The lunar sample is placed directly inside the storage device to provide the high purity nitrogen environment for the lunar sample to ensure that the sample is not polluted by the earth’s environment. To ensure that the water and oxygen specifications in the storage unit meet the requirements, a dynamic gas circulation needs to be established between the storage area and the external purification system, and disturbances of the air flow inside the storage unit can affect sample operation. In this paper, the composition of the lunar sample storage device and the three-dimensional structure are presented. The model of storage area analysis and calculation is established. Tetrahedron mesh is established by using Tetra / Mixed method. The influence of different nitrogen circulation interface layout on the internal flow field is calculated. The results show that the lower inlet and lower outlet can effectively reduce the internal flow disturbance. The developed lunar sample storage device has better environmental water and oxygen indexes than 0.1 × 10 -6, meeting the requirement of monthly sample storage.