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基于Enskog稠密气体理论,通过考察密度对气体物性及流动特性的影响,分析了微气体流动与稀薄气体流动相似性成立的条件。结果显示,若微气体流动中需要考虑稠密性对气体物性和宏观流动参数的影响时,表征微气体流动和稀薄气体流动的3个量纲一的特征数(Kn、Re和Ma)不可能同时对应相等,两种流动不可能相似。研究了稠密性对微气体流动特性和输运系数的影响,同时,分别以基于稠密气体理论的声速相对偏差小于5%和基于热力学分析的压力相对偏差小于0.5%为限,计算得出各种气体在两种流动相似性失效时的密度值。
Based on Enskog’s theory of dense gas, the similarity of gas flow and lean gas flow was analyzed by investigating the effect of density on gas physical properties and flow characteristics. The results show that the characteristic numbers (Kn, Re, and Ma) characterizing the three dimension 1s, which characterize the flow of micro-gas and the flow of lean gas, can not be simultaneous at the same time if the influence of the density on gas physical properties and macro-flow parameters needs to be considered in the flow of the micro- Equivalent to the two flows can not be similar. The influence of the denseness on the flow characteristics and transport coefficient of the micro gas is studied. Meanwhile, the relative sound velocity deviation based on dense gas theory is less than 5% and the relative pressure deviation based on the thermodynamic analysis is less than 0.5% respectively. Density of gas at failure of two flows.