Flow Field Characteristics Analysis Of High-Pressurized Spherical Gas Bearing

With the rapid development of science and technology, the small satellite attitude simulation has become an important branch of the modern aerospace simulation technology. Externally pressurized spherical air bearings can offer a nearly torque-free environment, perhaps as close ad possible to that of space, and for this reason it is the key component of the ground-based three-axis test-bed for simulation of spacecraft dynamics and control. In this thesis, externally pressurized spherical air bearings with inherent compensation possessing good characteristics are studied by means of theoretical analysis and experimental validation. The static stiffness and bearing capacity characteristics are investigated, which can provide guidance for the design of spherical air bearing. The main contents of this dissertation consist of the following parts.First, the establishment of three-dimensional model and the calculation of flow field characteristics for spherical air bearing was given. The hexahedral until and pyramid until fitting for large aspect ratio are mainly used when performing grid division, and the structured as well as unstructured grids are combined, which greatly reduced the number of grids and improve the computational efficiency.Secondly, we get mathematical relationship between air intake diameter, numbers, wrap angle, inlet pressure and the gas film thickness under the different working parameters through the simulation. Especially simulated its flow characteristics under high-pressure.Finally got the discipline of influence on the flow field characteristic caused by spherical air bearing through the comparison of experimental and simulation data.