摘 要：为较为准确地计算高转速水电机组高油位浸泡式润滑推力轴承的搅拌损耗，根据该类轴承的几何结构特点进行简化，推导出搅拌损耗计算的近似计算公式，分别通过近似公式和基于推力轴承高油位浸泡式油箱运行过程中的流场三维数值模拟方法来计算搅拌损耗。针对大型抽水蓄能机组推力轴承，计算了机组转速为120、210、270、350和500 r/min 5个工况下推力轴承的搅拌损耗，将数值模拟结果与近似计算值进行了对比分析。结果表明：搅拌损耗的大小与轴承转速正相关，转速越高，损耗越大；油系统循环管路进出口流量对搅拌损耗计算值的影响可忽略不计。数值模拟与近似公式计算的搅拌损耗在低转速工况偏差较大，二者的计算偏差随着转速的增高而降低。近似公式计算方法可用于推力轴承方案设计预估搅拌损耗，数值模拟方法可进一步用于轴承结构及几何参数的优化设计。

Abstract:In order to calculate the stirring loss of high oil level immersed lubricated thrust bearing in high speed hydroelectric unit,an approximation formula of stirring loss calculation is deduced according to the geometrical characteristics of the bearing,and the stirring loss is calculated by the approximation formula and numerical simulation method,respectively. With the thrust bearing of a large pumped storage unit,this paper calculates and compares the stirring loss of the thrust bearing under five working conditions with the rotational speeds of 120 r/min,210 r/min,270 r/min,350 r/min,and 500 r/min of the unit. The results show that the stirring loss is proportional to the rotational speed of the bearing; the higher the rotational speed is,the greater the loss is.The effect of the inlet and outlet flow on the stirring loss is negligible.The stirring loss calculated by numerical simulation and approximation formula has a large deviation at low rotational speed,and the calculation deviation of the two is decreased with the increase of rotational speed.The calculation method with the approximation formula can be used to estimate the stirring loss of the thrust bearing for the scheme design,and the numerical simulation method can be further used for the optimum design of the bearing structure and geometrical parameters.

TK73

四川省科技计划项目（2017GZ0053,2017JY0047,2017NZ0031）;西华大学研究生创新基金（ycjj2017205）