The journal bearings with multiple tilting pads are widely used to support the shaft assembly of turbo generators. With the considerations of variable viscosity and density, a model of tilting-pad journal bearing with multiple-pads was established, and was analyzed using finite difference method. A computer program was developed to calculate the minimum film thickness, pressure distribution and three-dimensional temperature distribution of each pad, and the effects of radial loads, rotational speeds and oil viscosity grades of nine cases on the thermal hydrodynamic lubrication ( THD ) of the bearings were analyzed. The results indicate that this model and its computer program are able to analyze the features of thermal hydrodynamic lubrication of multi-tilting-pad journal bearings. The oil viscosity and rotational speed have much effect on the THD of bearing. The titling angle and its position of pad influence the THD of some of the pads,result in some difference with the situation of circular journal bearing.%考虑变黏度、密度的情况,建立多瓦可倾瓦径向滑动轴承的数学模型,用有限差分法求解其热流体动力润滑(THD)模型,分别计算12块瓦可倾瓦径向滑动轴承的最小油膜、压力分布和三维温度场分布,分析不同载荷、不同转速、不同润滑油黏度等对轴承各瓦的热润滑性能影响.结果显示,建立的模型及其计算程序能计算分析多瓦可倾瓦径向滑动轴承的热润滑问题.润滑油黏度和转子转速对多瓦可倾瓦径向滑动轴承的热润滑性能有较大的影响；瓦块绕支点的倾斜以及瓦块所处的角度位置会影响部分瓦块的热润滑性能,出现与普通圆形径向滑动轴承不一致的润滑性能变化.
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