presented a criterion for the stability evaluation of a journal rotor-bearing system. A large number of scholars take lots of researches on dynamic features of generators and equipments.ĭynamic and static characteristics of hydrostatic and hydrostatic-dynamic hybrid gas lubrication bearing rotor system were studied by experimental and theoretical analysis in Ref. From the research technique route of high-speed turbine expansion generator, it was necessary that bearing-rotor dynamic characteristic research were carried out. That makes structural design of power cycle system simple and reasonable. Lubrication medium of aerostatic bearing can take supercritical carbon dioxide, organic working medium and natural gas, which get from operational environment and return to the operational environment. Combined with the characteristics of the above application environment, the aerostatic bearing was one of preferred support styles in high-speed turbine expansion generator. High-speed turbine expansion generator has the advantages of high speed, compact structure and high power density, which has broad application prospects in the power generation devices of supercritical CO2 power cycle, Organic Rankine Cycle and natural gas pressure energy recovery system, etc. Keywords: axial clearance, aerostatic bearing, bearing supply gas pressure (BSGP), dynamic characteristic. The paper gives some measures to improve the high-speed bearing-rotor system stability. The shafting stability under the same axial clearance for two ends is better than the condition under the different bearing axial clearance. The experimental results of rotor dynamic characteristics under different bearing supply gas pressure groups show that gas film whirling and whipping occurred in the mentioned bearing-rotor system during the speed up process when the axial clearance for two ends were different. Static characteristic tests for effects of bearing supply gas pressure on the bearing axial clearance are carried out to provide the rotor axial position under different bearing supply gas pressure groups, which showed that the bearing thrust performance changed with bearing supply gas pressure. Nonlinear dynamic behavior of high-speed turbine expansion generator rotor, including gas film whipping and gas film half-speed whirling, were analyzed in the experiments. The experimental investigations focus on the dynamic characteristics of high-speed turbine expansion generator rotor, which was supported by gas aerostatic bearings. Bearing-rotor system dynamic characteristic is the key influence on high-speed power equipment stability.
0 Comments
Leave a Reply. |