Study on Conjugate Heat Transfer of High-pressure Circular Aerostatic Bearing Based on Workbench
The convective heat transfer of high-speed airflow in the flow channel of high-pressure circular aerostatic bearing is closely coupled with the heat conduction in the discs of bearing,which constitute a typical conjugate heat trans-fer(CHT)problem.Based on the Fluid Flow(Fluent)module of ANSYS Workbench,the numerical simulation of the CHT of the bearing was implemented.The velocity and pressure distributions in the flow channel of the bearing,the temperature distributions of the fluid domain and the solid domain,as well as the heat flux distribution on the interface were obtained consequently,which were compared with those of non-CHT with constant temperature wall.Some basic characteristics of CHT of the bearing were reasonably concluded.It indicates that the calculated results between the two methods exist appar-ent difference.Under the condition of non-CHT with constant temperature wall,the airflow in flow channel only absorbs heat and the heat flux on the interface of fluid domain is always positive.Whereas under the condition of CHT,the heat flux on the interface of fluid domain is positive in some intervals and negative in others,namely,endothermic and exothermic phenomena occur at the same time,and it shows that there is a complex conjugate acting mechanism between the heat con-duction of the discs and the convection heat transfer of the airflow.In contrast,the research model of CHT is more in line with the actual working conditions of high-pressure static bearing.The research results provide useful guidance for the de-sign and manufacture of this type of bearings.
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