PDC推力轴承工作环境因素对热失效影响规律的仿真

Simulation of the Influence of Working Environment Factors on Thermal Failure of PDC Thrust Bearing

在小尺寸涡轮钻具的研究过程中,为了研究轴承转速、轴向载荷和工作流量大小对聚晶金刚石复合材料(Polycrystalline Diamond Composite,PDC)推力轴承热失效的影响,建立PDC推力轴承模型。基于ANSYS Workbench仿真软件,采取单因素分析法对推力轴承模型进行热力耦合仿真。在不同转速、轴向压载和流量大小的条件下,分别对PDC轴承热失效的变化规律进行总结。仿真结果显示,在PDC轴承热失效的极限状况下,轴承PDC复合片上的线速度与轴承轴向压载呈负指数关系(即线速度越小,热失效的压载越大;线速度越大,临界压载就越小)。工作流量大小与临界轴向载荷呈正相关,通过控制工作流量大小可有效减少轴承热失效情况的发生。这些规律可为今后PDC轴承的设计分析和使用提供重要参考。

In the research process of small size turbodrill, in order to study the influence of bearing speed, axial load and working flow on the thermal failure of Polycrystalline Diamond Composite(PDC) thrust bearing, the PDC thrust bearing model is established. Based on the ANSYS Workbench simulation software, the thermal-mechanical coupling simulation of the thrust bearing model is carried out by using the single factor analysis method. The thermal failure rules of PDC bearings are summarized under the conditions of different rotational speed, axial ballast and flow rate. The simulation results show that under the limit condition of thermal failure of PDC bearing, there is a negative exponential relationship between the linear velocity on the bearing PDC composite and the bearing axial ballast(The smaller the linear speed is, the greater the thermal failure ballast is;the higher the linear speed is, the smaller the critical ballast is). The working flow rate is positively correlated with the critical axial load, and the thermal failure of the bearing can be effectively reduced by controlling the working flow rate. The above rules can provide an important reference for the design, analysis and use of PDC bearings in the future.