滑油射流冲击旋转壁面的流动换热数值模拟研究

In order to investigate the effects of jet velocity and engine rotation speed on the cooling effect of the bearing chamber rotating wall, a numerical study was performed to investigate the flow and heat transfer characteristics of the oil jet impinging on the rotating wall, with the main concern on the effects of jet Reynolds number Re_j and rotating Reynolds number Re_ω on oil flow and the overall and local heat transfer of the wall at medium and high rotation speeds. So as to reflect the effects of different working conditions on the wall heat transfer, the average heat transfer of the wall, the Nusselt number of the wall, and the local average Nusselt number were respectively used for the comprehensive heat transfer analysis. The results show that with the increase of jet velocity, the amount of oil attached to the wall increases, and the average heat transfer and local heat transfer increase by 32% and 40%, respectively. With the increase of the wall rotating speed, the amount of oil attached to the wall decreased, the average heat transfer on the wall decreased by about 13%, and the local heat transfer increased by about 62%.