过渡流区内努森压缩机的微纳流动升压特性  

Pressure Rise Characteristics of Knudsen Compressor in Micro-Nano Flow at Transition Flow Region

作　　者：于晓慧 李晓彤 耿佳宝 Yu Xiaohui;Li Xiaotong;Geng Jiabao(School of Energy and Enviromental Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401

出　　处：《微纳电子技术》2023年第4期587-594,共8页Micronanoelectronic Technology

基　　金：国家重点研发计划项目(2022YFE0208300);惠州市绿色能源与先进材料研究所项目(KYXM-2022002);河北省高等学校科学技术青年拔尖项目(BJ202102021)。

摘　　要：为解决努森压缩机过渡流区中理论与实际不相匹配的问题,通过实验探究了小温差对努森压缩机升压性能的影响,再运用格子玻尔兹曼方法建立过渡流区努森压缩机模型,分析了冷热腔温差和不同气体工质对努森压缩机升压及流动性能影响。结果表明,温差从10 K升至50 K,空气热流逸流与泊肃叶流速度均增加,温差每升高10 K,热流逸流速率增长比泊肃叶流分别高2%、6%、10%、14%,同时努森压缩机压力比分别增加4.39%、8.82%、13.30%、17.81%、22.38%。相同温差下,Ar、N_(2)、O_(2)、He、H_(2)的压力同空气相比分别增长了6.5%、6.6%、6.8%、7.2%、8%。分子直径越小,气体稀薄性越强,热流逸效应越高,导致压升逐步增加,因此选取直径小的气体分子更有助于提升努森压缩机的流动和升压特性。To solve the problem of mismatch between theory and practice in the transition flow region of the Knudsen compressor,the influence of small temperature difference on the pressure rise characteristics of the Knudsen compressor through experiments was explored,then the lattice Boltzmann method was used to establish the model of the Knudsen compressor in the transition flow region,and the influences of the temperature difference between the hot and cold chambers and different gas working fluids on the pressure rise and flow performances of the Knudsen compressor were analyzed.The results show that when temperature difference increases from 10 K to 50 K,the velocities of air thermal creeping flow and Poiseuille flow increase;and when the temperature difference rises 10 K each time,the velocity increases of thermal creeping flow are 2%,6%,10%and 14%higher than those of Poiseuille flow,meanwhile the pressure ratios of the Knudsen compressor increase by 4.39%,8.82%,13.30%,17.81%and 22.38%,respectively.Under the same temperature difference,the pressures of Ar,N_(2),O_(2),He and H_(2) respectively increase by 6.5%,6.6%,6.8%,7.2%and 8%compared with air.The smaller the molecular diameter,the more rarefied the gas,the higher the thermal transpiration effect,resulting in a gradual increase in pressure rise,so the selection of gas molecules with a small diameter is more conducive to improving the flow and pressure rise characteristies of the Knudsen compressor.

关 键 词：努森压缩机 过渡流 热流逸效应 泊肃叶流 升压特性 

分 类 号：TH45[机械工程—机械制造及自动化] O356[理学—流体力学]