The Experimental Study On Dynamic Stability Of New Turbine Shaft Combined With Cooling And Power At High-Speed

Because of the high efficiency, clean energy development, distributed energy supply system as the main direction of the future had been paid attention by many countries. The micro gas turbine as the core of the system of distributed energy supply had been became the direction of modern academic research.This paper is supported by the National Science-technology Support Plan Projects" The CCHP technical research and demonstration of miniature mobile gas turbine". The test of new turbine shaft combined with cooling and power at high-speed was established. Based on high-speed turbine-generator rotor system supported by gas bearing, experimental investigations of the axial clearance and speed-rise are the effect of the stability of high-speed turbine shaft, and the main work of the paper is as follows:1. The test bench of new high-speed turbine shaft of cooling and power was build, which illustrated the whole test bench including power unit, centralized control unit and the host unit.2. According to the structural characteristics of the bench power shafting, test was conduct with the shafting. First, the axial clearance of turbine rotor shaft was measured. Secondly, when gas supply pressure of left bearing is the same with the right, the bearing resistance characteristics was explored by measuring the change in both ends of the rotor bearing axial clearance. Finally, when gas supply pressure of left bearing is unequal to the right, the performance of thrust bearings was explored by measuring the change in both ends of the rotor bearing axial clearance. And the axial gap data was obtained under different gas pressure, and then provided references for the experiment.3. While the axial clearance of the left end and the right end of the rotor were equal or the axial clearance of the left end of the rotor is greater than the right or the axial clearance of the left end of the rotor is less than the right, series of shafting dynamic test were ran to study vibration characteristics of the rotor shaft by adjusting the gas pressure.4. Low-frequency characteristics and soaring characteristics of the dual-turbo four disc structure were analyzed by nonlinear analysis method. And the characteristics compare with characteristics of steam turbine to explores the characteristics of the shaft and give some experimental regulation. Based on the test bench of new high-speed turbine shaft of cooling and power, experiments of vibration characteristics and the stability to verify the effectiveness of the vibration test and analysis methods.