月球样品存储装置设计

Design and Experimental Evaluation of Containment System for Lunar Samples

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。

The ultra-clean containment system was designed for storage,observation and analysis of lunar samples in highly pure N_2 atmosphere. The fluid field in the circulation of N_2 between thepurificationunit and storage chamber was mathematically modeled,theoretically analyzed,numerically simulated in finite element method with software Fluent and experimentally evaluated to reduce the possible N_2 turbulence in the storage area. The impact of the top-entry bottom-exit layout of the storage box-chamber on the N_2 flow field was investigated. The simulated results show that the top-entry bottom-exit configuration is capable of significantly reducing the flow field disturbance.The prototyped containment system for lunar samples was tested. The measured results show that the water vapor and oxygen contaminants reached 0. 1 × 10^（-6） and only small disturbance occurred in the chamber,satisfying the lunar sample storage requirements.