圆锥液体静压轴承的耦合热态分析及实验研究

Simulation Analysis and Experimental Study on Coupling Thermal Characters of Conical Hydrostatic Bearing

针对圆锥液体静压轴承的热效应,分析其生热和传热的机制,指出圆锥液体静压轴承的热态性能属于耦合传热问题,必须综合考虑润滑油、轴瓦、转轴等零件的生热和传热情况。采用ANSYS CFX软件建立圆锥液体静压轴承耦合热态模型,获得轴承温度场的分布及变化规律,并搭建实验平台对模型进行验证。结果表明:热平衡时,圆锥液体静压轴承各处温度差别较大,随着转速的增大和进油压力的减小,轴承的温升增大;圆锥液体静压轴承热态性能仿真计算结果和实验结果吻合,证明采用圆锥液体静压轴承耦合热态模型能够较为准确地获得轴承的热态性能变化情况。

Aimed at the problem of heating effect of the conical hydrostatic bearing,the mechanism of the heat generation and transfer was analyzed. The thermal character of conical hydrostatic bearing was indicated to be a coupled thermal problem,the heat produce and heat transfer conditions of oil,bearing,shaft and other parts must be considered as a whole system. A coupled heat transfer model of the bearing system was built by ANSYS CFX software,with which the bearing temperature field distribution and the heat transfer status was solved. An experimental platform was built to verify the model. Results show that the temperature of the bearing is quite different at different parts when it is in thermal equilibrium.The temperature rising of the bearing is increased along with the increasing of rotational speed and the decreasing of inlet pressure. The simulation results are identical to the experiment results,which proves that using the coupled thermal model to analyze the thermal state of conical hydrostatic bearing is quite accurate.