密闭腔中自然对流气体摆特性的有限元分析

论述了采用有限元法分析密闭腔中自然对流气体的摆特性。利用ANSYS-FLOTRAN CFD软件,通过建模、划分网格、加载和求解等途径,计算了在不同倾斜状态下二维密闭腔中点热源引起的对流场和温度场。结果表明,在浮升力作用下,二维密闭腔中气流的方向总是垂直向上,有摆的特性。密闭腔倾斜时,腔体中各点处的温度分布随倾斜角度而变化,气体摆式倾角传感器就利用这一特性敏感倾斜角度。

FEM Analysis of the Pendulum Characteristic of Nature Convection in Dimensional Enclosure

The pendulum characteristic of nature convection gas in dimensional enclosure is analyzed by finite element method (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.