气体对磁流体动力学传感器影响机理的探讨  

Discussion on the influence mechanism of gas on magnetohydrodynamic sensor

作　　者：夏赣民 李醒飞[1] 刘帆 Xia Ganmin;Li Xingfei;Liu Fan(The State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学精密测量技术与仪器国家重点实验室,天津300072

出　　处：《仪器仪表学报》2023年第4期238-248,共11页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(62203322,61733012)项目资助。

摘　　要：由于气体和导电流体性质上的差异,导电流体中气体的存在将对磁流体动力学(MHD)传感器的输出特性产生影响。基于电磁感应理论和两相流理论,文章推导并建立了导电流体中含气体的MHD传感器VOF模型。通过ANSYS Fluent对含气体的MHD传感器输出特性进行仿真分析,同时搭建试验平台对不同气体含量MHD传感器进行试验验证。结果表明,导电流体中的气泡在低频时容易被拉伸撕裂成小气泡并随着角振动分散,同时使得流体环流场和电场产生偏移和畸变,角振动频率越低,此现象越明显;当导电流体中不含气体时角振动频率和幅值、重力加速度及偏心等外部因素对MHD传感器的输出特性无影响;当导电流体中含有气体时,MHD传感器的输出特性畸变等随气体含量、重力加速度和偏心的增大而增大,随角振动频率和幅值的增大而减小。文章研究成果能够为MHD传感器导电流体灌装工艺控制提供指导,有助于MHD传感器精度和稳定性的提升。Due to the difference in the properties of gas and conductive fluid,the presence of gas in conductive fluid may affect the output characteristics of the magnetohydrodynamic micro-angular vibration(MHD)sensor.Based on electromagnetic induction theory and twophase flow theory,the volume of fluids(VOF)model of the MHD sensor containing gas in conductive fluid is deduced and established.ANSYS fluent is used to simulate and analyze the output characteristics of the MHD sensor with gas.An experimental platform is established to verify the MHD sensor with different gas content.The results show that the bubble in conductive fluid is easily torn into small bubbles at low frequencies and disperse with angular vibration,which causes the flow field and electric field of the fluid to shift and distort.The lower the frequency of angular vibration,the more obvious this phenomenon is.When there is no gas in conductive fluid,the external factors such as angular vibration frequency and amplitude,gravity acceleration and eccentricity have no influence on the output characteristics of the MHD sensor.When the conductive fluid contains gas,the output characteristic distortion of the MHD sensor increases with the increase of gas content,gravity acceleration and eccentricity,and decreases with the increase of angular vibration frequency and amplitude.The research results of this article can provide guidance for the filling process control of the MHD angular velocity sensor and help to improve the accuracy and stability of the sensor.

关 键 词：MHD微角振动传感器 导电流体 气液两相流 偏心分析 

分 类 号：TH89[机械工程—仪器科学与技术]