多孔泡沫金属填充的通道型正压标准漏孔漏率的数值模拟  

Numerical Simulation of Leak Rate of Channel Type Positive Pressure Standard Leak Filled with Porous Foam Metal

作　　者：刘燚 刘贝贝 张忠立[1] 林正皓 蒋厚庸 周宇仁 LIU Yi;LIU Beibei;ZHANG Zhongli;LIN Zhenghao;JIANG Houyong;ZHOU Yuren(Shanghai Institute of Measurement and testing Technology,Shanghai 201203,China)

机构地区：[1]上海市计量测试技术研究院,上海市在线检测与控制技术重点实验室,上海201203

出　　处：《真空科学与技术学报》2023年第11期931-937,共7页Chinese Journal of Vacuum Science and Technology

基　　金：上海市市场监督管理局科研计划项目(2022-03)。

摘　　要：针对同类通道型正压标准漏孔在不同工况下漏率的机理问题,将多孔泡沫金属填充于通道型正压标准漏孔中并建立数学模型。采用数值模拟的方法分别分析了不同工况条件下对通道型正压标准漏孔漏率的影响,同时给出泡沫金属内部速度场分布。结果表明,在恒定的气源压力下,与Air、He以及D2相比,H2获得的漏率最大;漏孔的漏率随气源压力的增大而增大;对于恒定的孔径或孔隙率条件下,通道型正压标准漏孔的漏率随着孔径或孔隙率的增大而增大,随通道型正压标准漏孔长度的增加而降低;非线性变化孔隙率能够有效改善并控制漏率的大小。该项研究对正压标准漏孔的生产和发展、计量方面的检漏工作,以及控制漏率来优化和设计密封系统性能方面提供了有价值的参考意义。In order to address the mechanism of leakage rate variation for similar channel-type positive pressure standard leak holes under different operating conditions,a mathematical model was established by filling the channel-type leak holes with porous foam metal.Numerical simulations were conducted to analyze the impact of different operating conditions on the leakage rate of the channel-type positive pressure standard leak holes,and the velocity field distribution inside the foam metal was also provided.The results show that under constant air source pressure,compared with Air,He and D2,H2 has the largest leak rate,and the leak rate of the leak hole increases with the increase of air source pressure.Under the condition of constant pore diameter or porosity,the leakage rate of channel type positive pressure standard leak increases with the increase of pore diameter or porosity,and decreases with the increase of channel type positive pressure standard leak length.Nonlinear change of porosity can effectively improve and control the leakage rate.This study provides valuable reference significance for the production and development of positive pressure standard leaks,leak detection in metrology,and optimizing and designing sealing system performance by controlling leakage rates.

关 键 词：多孔介质 孔隙率 孔径 漏率 数值模拟 

分 类 号：TB774[一般工业技术—真空技术]