轴向间隙对高速双涡轮转子稳定性的试验

通过轴向间隙静态试验判断轴承供气压力不同时的轴向间隙，采用时间三维谱图、轴心轨迹、频谱分析等非线性振动测试及分析方法，研究了轴向间隙对高速涡轮转子稳定性的影响.结果表明:当左右两侧轴向间隙不相等时，在升速过程中会出现气膜振荡和半速涡动现象；当左右两侧轴向间隙相等时，气膜振荡和半速涡动消失，能提高轴承转子系统的稳定性. 

Experiment on axial clearance on high-speed dual-turbine rotor stability

The axial clearance under different bearing gas supply pressures can be measured through rotor static test. The effects of the axial clearance on the stability of high-speed dual-turbine rotor of generator can be analyzed by vibration test and analysis methods, including three-dimensional spectrum, axis center tracks and frequency spectrum characteristics. Results showed that the gas film half-speed whirl and gas film whip appeared during run-up when the left and right sides of the axial clearance were not equal. When the axial clearance of the left and right ends of the rotor was equal, the gas film half-speed whirl and gas film whip disappeared, which could enhance the stability of gas bearing rotor system.