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刘燚, 胡鑫丹, 张忠立, 邬昕, 蒋厚庸, 刘贝贝. 数值研究温度对多孔介质填充的通道型正压标准漏孔泄漏率的影响[J]. 真空科学与技术学报. DOI: 10.13922/j.cnki.cjvst.202405006
引用本文: 刘燚, 胡鑫丹, 张忠立, 邬昕, 蒋厚庸, 刘贝贝. 数值研究温度对多孔介质填充的通道型正压标准漏孔泄漏率的影响[J]. 真空科学与技术学报. DOI: 10.13922/j.cnki.cjvst.202405006
LIU Yi, HU Xindan, ZHANG Zhongli, WU Xin, JIANG Houyong, LIU Beibei. Numerical Research on the Influence of Temperature on the Leakage Rate of Channel Type Positive Pressure Standard Leak Filled with Porous Media[J]. CHINESE JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY. DOI: 10.13922/j.cnki.cjvst.202405006
Citation: LIU Yi, HU Xindan, ZHANG Zhongli, WU Xin, JIANG Houyong, LIU Beibei. Numerical Research on the Influence of Temperature on the Leakage Rate of Channel Type Positive Pressure Standard Leak Filled with Porous Media[J]. CHINESE JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY. DOI: 10.13922/j.cnki.cjvst.202405006

数值研究温度对多孔介质填充的通道型正压标准漏孔泄漏率的影响

Numerical Research on the Influence of Temperature on the Leakage Rate of Channel Type Positive Pressure Standard Leak Filled with Porous Media

  • 摘要: 针对多孔介质填充的通道型正压标准漏孔(CTPPSL),在实际测量泄漏率时受温度的影响无法控制和获得泄漏率随温度变化的规律。本文采用数值模拟的方法建立数学模型,描述流体在多孔介质填充的CTPPSL内部流动机理。分析了不同进气温度和压力、孔隙率和孔径共同作用对CTPPSL泄漏率影响的三维曲面图,并给出了速度场分布。结果表明:CTPPSL的泄漏率随进气温度的升高而降低,随进气压力、孔隙率和孔径的增大而增大;当进气压力为700 kPa时,温度每相差2 K,获得泄漏率的相对误差为0.54%;当进气温度为291 K时,孔隙率 \varepsilon 从 0.85增加到 0.95获得的泄漏率增长速率比孔隙率 \varepsilon 从 0.55增加到0.65获得的泄漏率增长速率高63.5%;此外,在相同的孔隙率变化幅度内,CTPPSL泄漏率的增长速率随孔径的增大而增大。基于研究结果得到了在温度和压力、孔隙率、孔径共同作用下可以有效控制和调节CTPPSL泄漏率大小的结论。该项研究对未来CTPPSL的加工设计,控制泄漏率变化快慢程度提供有价值的参考意义。

     

    Abstract: For channel-type positive pressure standard leak (CTPPSL) filled with porous media, it is difficult to control and obtain the variation of leakage rate with temperature in actual measurement due to the influence of temperature. This paper establishes a mathematical model using numerical simulation to describe the flow mechanism of fluid inside CTPPSL filled with porous media. The three-dimensional surface graph of the combined influences of different inlet temperatures and pressures, porosity, and pore diameter on the leakage rate of CTPPSL was analyzed, and the velocity field distribution was provided. The results show that the leakage rate of CTPPSL decreases with the increase of inlet temperature and increases with the increase of inlet pressure, porosity and pore diameter. When the inlet pressure is 700 kPa, for every 2 K difference in temperature, the relative error of the obtained leakage rate is 0.54%. While the inlet temperature is 291 K, the growth rate of the leakage rate obtained when the porosity \varepsilon increases from 0.85 to 0.95 is 63.5% higher than that obtained when the porosity ε increases from 0.55 to 0.65. Besides, within the same variation range of porosity, the growth rate of the leakage rate of CTPPSL increases with the increase of pore diameter. Based on the research results, the conclusion was drawn that the leakage rate of CTPPSL can be effectively controlled and adjusted under the combined action of temperature, pressure, porosity and pore diameter. This research provides valuable reference significance for the processing design of CTPPSL in the future and controlling the rate of change of the leakage rate.

     

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