微涡轮发动机轴承系统润滑性能的实验研究

摘要

The double-row-hole hydrostatic/hydrodynamic thrust bearing with spiral groove is applied to the gas lubricated bearing system on micro turbine engine which is centimeter magnitude three layer structure in this paper, and the influence of static pressure orifice diameter and bearing clearance of the hybrid gas thrust bearing on the gas flow rate and the bearing capacity is analyzed. The bearing system prototype is fabricated by the CNC machine, and orifice sizes and defects of the hydrostatic orifice prototype are detected by the optical microscope. The gas bearing test platform is established, and the related experimental study is carried out. The results show that the hybrid thrust bearing with spiral groove can provide good stable bearing capacity for the high-speed rotating rotor, and provide a certain self-centering capability when the rotor is instable.%将双排孔动静压螺旋槽式推力轴承应用于厘米量级的三层结构微涡轮发动机气体润滑轴承系统中,分析了螺旋槽气体动静压混合推力轴承的静压节流孔直径和轴承间隙对供气流量和承载力的影响.采用数控机床加工轴承系统样机,并采用光学显微镜检测了样机中推力轴承静压节流孔的尺寸及缺陷.搭建了气体轴承测试系统,并进行了相关的实验研究.结果表明:螺旋槽动静压混合推力轴承能够为高速旋转的转子提供较好的稳定承载力,并在失稳时提供一定的自恢复能力.