基于耦合传热的圆锥液体静压轴承热态性能分析

Thermal Performance Analysis of Conical Hydrostatic Bearing Based on Conjugate Heat Transfer Method

针对圆锥液体静压轴承的发热问题,利用CFX软件建立了轴承系统耦合传热模型。首先分析了网格数量对计算精度的影响,然后求解获得了轴承的温度场分布和热量传递情况,最后分析了不同参数对轴承热态性能的影响规律。结果表明,采用CFX软件计算圆锥液体静压轴承耦合传热问题是可行的,与绝热假设下的计算方法相比,耦合传热有效地反映了真实的传热情况;圆锥液体静压轴承的端泄散热占总散热量的大部分,轴颈散热能力最弱,在不同的转速和进油压力下,各个方向上的散热比率发生变化。

According to the problem of temperature rising of conical hydrostatic bearing,a coupled heat transfer transfer model of the bearing system was built by CFX software. First the grid number effects on the computational accuracy was considerd,and then the bearing temperature field distribution and the heat transfer status were solved. Finally the influence of different parameters on the thermal performance of the conical hydrostatic bearing was studied. Results show that using CFX software to calculate coupled heat transfer problem of the conical hydrostatic bearing is feasible. Compared with the calculation based on adiabatic assumption,coupled heat transfer model effectively reflects the real situation of the heat transfer. The heat loss taken by end leakage accounts holds the most of the total heat loss,and the shaft＇s cooling capacity is poor. In different speed and inlet oil pressure,cooling rate of all directions changes.