浮环轴承温度预测模型的仿真及试验验证

Temperature Predication Model of Floating Ring Bearing and Its Experimental Validation

综合考虑温黏效应和热膨胀导致的半径间隙变化,结合动载作用下的非线性油膜力,考虑压力流和剪切流对摩擦力矩的共同影响,建立了更为精确的涡轮增压器浮环轴承系统温度预测模型。在涡轮增压器浮环轴承试验台上对回油温度进行实测,并对仿真结果进行对比分析。研究结果表明:仿真所得结果与试验所测结果有较好的吻合性,证明了温度预测模型的准确性;温度和转速变化关系接近线性,温升、黏度、环速比和轴承间隙等变化均在合理范围之内,浮环轴承工作状态良好。

Based on nonlinear dynamic oil-film forces, a more precise temperature prediction model of the floating ring bearings of a turbocharger was presented. In this model, the influences of thermal effect on oil viscosity and bearing deformation were considered, and the influences of pressure flow and shear flow on the ring speed ratio （floating ring speed to rotor spin speed ratio） were also taken into account. The oil return flow temperatures measured from experiments were compared with the simulated results. The analysis results indicate that the errors of the model are in an allowable range, verifying the effectiveness of the model. The relationship between oil temperature and rotor spin speed is nearly linear. The variations of temperature, oil viscosity, ring speed ratio and bearing clearance are in reasonable ranges. And the floating ring bearings work well. This would be theoretical foundations for the future R＆D and structural optimization of the floating ring bearings.