In this paper, the pendulum characteristic of nature convection gas in dimensional enclosure is analyzed by FEM. Using ANSYS-FLOTRAN CFD program, the stream field and the temperature field caused by the point heat source, when the two-dimensional enclosure is inclined, has been obtained by a series of procedure, such as model building, meshing, loads applying and equation solving. The results are as follow: (1)Under the buoyancy lift affecting, the direction of nature convection gas always keeps the vertical upward in two-dimensional enclosure, nature convection gas has the pendulum characteristic. (2)When the dimensional enclosure is inclined, temperature distribution at the several points in dimensional enclosure will change with the tilt angle. The pendulum characteristic can be utilized to measure the tilt angle by the gas pendulum tilt sensor.
The impact that distance between thermal wires and nozzle on flow distribution of fluidic gyroscope with three different cavity structures was researched. Using the Finite element method we calculated the two-dimensional flow distribution of fluidic gyroscope with rectangular cavity and two streamlined cavity structures when the distance d between thermal wires and nozzle is different. The results show that: flow velocity at the outlet in two streamlined cavities is larger than that in rectangular cavity, which is 28.87% and 28.91% of flow velocity at the nozzle respectively; the velocity in the three cavities decrease with d, the velocity in streamlined cavity 1 is always larger than that in streamlined cavity 2. When d = 16mm and 17mm, there are a larger velocity and a smaller x-axial velocity of the fluidic beam center in streamlined cavity 1, and velocity difference of two thermal wires increase, so the resolution of fluidic gyroscope can have an improvement.
In this paper we have a comparative study to improve the measurement range of the fluidic gyroscope. Using ANSYS-FLOTRAN CFD software, finite element simulation was conducted by a series of procedures, such as two-dimensional model building, meshing, applied loads and equation solving, we calculated the flow distribution in the sensitive component of fluidic gyroscope with single nozzle and nozzle array. The results show that the upper limit measurement of fluidic gyroscope is the input angular velocity when fluidic column axis deflects to the position of thermistors, and using nozzle array can change the airflow distribution in the sensitive component and achieve the purpose of improving the measurement range of fluidic gyroscope.
Based on the linearity of the MEMS thermal element fluidic gyroscope compensation. By analyzing the results of the linear characteristic of the fluidic gyroscope sensor output, comparator linearity compensation two implementation methods, the introduction of the microcontroller and the temperature sensor, to achieve the linearity compensation of the gyro output signal. The experiments show that: after compensation, the non-linearity of the fluidic gyroscope5%down to 0.5%, to-120°/s~+120°/s measurement range from-40°/s~+40°/s Fluidic gyroscope linearity compensation with low non-linearity, wide measuring range.
In this paper, influence of the outlet aperture of sensitive chamber on the stability of fluidic gyroscope has been studied. Using ANSYS-FLOTRAN CFD software, the finite element simulation was conducted by a series of procedures, such as two-dimensional model building of fluidic gyro, meshing, loads applying and equation solving, we calculated the airflow distribution in sensitive chamber of fluidic gyro with different outlet apertures. The results show that the airflow would decay and diffuse after it injects into the chamber through nozzle, the bigger the outlet aperture, the smaller the pressure in the outlet-side and the airflow velocity discharged from the outlet, and the more seriously the airflow decay and spread. An effective way to improve the stability and structural optimization of the fluidic gyro output has been studied in this paper.
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