压电泵振动形成的气流速度分布及受力分析  

Study on Distribution of Fluidic Velocity and Force Analysis of the Airflow Angle Velocity Sensor

作　　者：靳映霞[1] 周菁[2] 张滨 郑永红[1] 张福学[4] 

机构地区：[1]北京邮电大学电子工程学院,北京100876 [2]玉溪师范学院物理与教育技术系,云南玉溪653100 [3]北京市合众达电子有限公司,北京100086 [4]北京信息科技大学传感器技术研究中心,北京100101

出　　处：《压电与声光》2008年第5期564-567,共4页Piezoelectrics & Acoustooptics

基　　金：北京市传感器重点实验室开放课题基金资助项目(53062018)

摘　　要：研究了实际工作条件下,压电气流式角速度传感器敏感元件内气体受力和运动状态。根据动态时气体受力分析,选择计算模型和边界条件,并列出气体的Navier-Stokes(N-S)方程。利用CDF软件有限体积法中压力的隐式算子分割(PISO)算法,计算气体速度分布。结果表明,静态时,气体在腔体内形成相对稳定且随速度边界进行周期性变化的速度场,不同周期中相同时间点上,气体速度变化不大,热敏丝所处位置的气体速度变化范围是[-0.007 079 m/s,0.007 306 m/s],速度变化的周期等于泵振动周期,两根热敏丝对应点的气体速度差为零;输入角速度为2πrad/s时,两根热敏丝上对应点气体速度差为0.001 m/s,气体最大速度偏离中心对称轴0.197 4 rad。Base on the actual working state of the airflow angle velocity sensor, the force analysis and kinetic state of the gas located in the sense organ was carried out. According to the force analysis under dynamic conditions, boundary conditions, computational model and Navier-Stokes equations were listed. The distribution of fluidic veloc- ity was calculated with CFD using PISO arithmetic. There were two results obtained： Under static condition, stead- y-going velocity of gas in the cavity is changed periodically along with the vibration of pump. The velocities of gas are almost unaltered at same time of different cycle. The changing bound of velocity located at hot wire is [-0. 007 079 m/s, 0. 007 306m/s]. The cycle of variety is same to pump. The difference of gas located at the hot wire is zero; In the ease of 2n rad/s inlet angle velocity, the difference between the velocities, which were located on the two hot wires in jet room, is 0. 001 m/s. On the section hot wires covered, the maximal velocity of airflow departed from the central symmetrical axes of 0. 197 4 rad.

关 键 词：受力分析 运动状态 科氏力 离心力 N-S方程 

分 类 号：TN379[电子电信—物理电子学]