高压圆盘气体轴承轴对称模型的共轭传热分析

Conjugate Heat Transfer Calculation of 2D Axisymmetric Model of High-Pressure Circular Aerostatic Bearing

高压圆盘气体轴承流道间隙内高速气流的对流换热与轴承圆盘内部热传导紧密耦合在一起,是一个典型的共轭传热问题。为提高计算效率,采用二维轴对称模型,使用ANSYS ICEM网格划分软件对流体域和固体域进行结构网格划分;使用ANSYS Fluent数值模拟软件,计算了二维轴对称条件下高压圆盘气体轴承气膜对称线上的马赫数、静温分布,流固耦合面上的热流密度分布,以及轴承圆盘固体域的温度场。将二维计算结果同已有的三维模型计算结果做对比,二者基本吻合,可以很好地相互验证计算结果的可靠性;对进一步分析高压圆盘气体轴承更为复杂的其他热流固耦合问题,提供了简化思路。

The convective heat transfer of high-speed airflow in the flow channel of high-pressure circular aerostatic bearing(HPCAB) is closely coupled with the heat conduction in the discs of bearing,which constitute a typical conjugate heat transfer(CHT) problem.In order to improve computational efficiency,a 2D axisymmetric model was adopted in this study.Using ANSYS ICEM software,structural grid division was performed on the fluid and solid domains.Using the ANSYS Fluent numerical simulation software,the distribution of Mach number and static temperature on the symmetry line of gas film,heat flux distribution at the fluid-solid interface of HPCAB based on axial symmetry condition,and temperature field of bearing discs were calculated.The comparison of the calculation results of 2D model with existed results of the 3D model shows that the both are basically consistent with each other.The reliability of the calculation results can be well verified with each other,and a simplified approach is provided for further analyzing other more complex thermo-fluid-structural coupling problems of HPCAB.