Numerical simulation and experiment for heat transfer between oil film and inner wall of bearing chamber

It is necessary to analyze heat transfer between the lubricating oil and the inner wall of the rear bearing chamber in the design of the heat protection structure for an aero-engine. The characteristics of the influence of the inner wall heat transfer from the oil film is obtained through both experiments and numerical simulation. The temperature distribution of the outer wall, inner wall and the oil film is tested to calculate the heat flux and the transfer coefficient. The simulation of the test rig is carried out using fluid-structure coupling with heat transfer, and the CLSVOF (Coupled Level Set and Volume Of Fluid) model is adopted to simulate the gas/oil flow. Comparisons of the local heat flux are then made between the experiments and the numerical simulation under different conditions, and the results show that the simulation results agree well with the experiment data. The relation between the heat coefficient and the local oil film Reynolds number Re_l is also discussed. The local Nusselt number Nu_w near the wall is directly proportional to 0.7 power of local Reynolds number Re_l. In addition, analysis of the influence of the rotating speed shows that Nu_w is proportional to 0.345 power of the rotary shaft rotational Reynolds number Re_rot.