向心透平发电膨胀机静压气体轴承设计与承载特性分析

为提升有机朗肯循环（organic Rankine cycle，ORC）系统向心透平发电膨胀机静压气体轴承的承载力与刚度，采用表压比法设计了以R245fa为润滑工质的静压气体轴承，分析转子偏心率、供气孔尺寸、进气压力对静压气体轴承承载力与刚度的影响。实验结果表明：在相同供气压力下，轴承承载力与刚度随着转速的增大而增大；在相同转速下，0.7 MPa供气压力相对于其他气体供气压力轴承的承载力与刚度略高；静压气体轴承的偏心率越大承载力越大；相同供气孔直径下，静压气体轴承的承载力与刚度随着转速的升高而升高；随供气孔直径增大，静压气体轴承的承载力和刚度也随之增大。

Design and Loading Characteristics Analysis of Aerostatic Bearings for Radial Inflow Turbogenerator

In order to improve the load carrying capacity and stiffness of the aerostatic bearings of the radial inflow turbogenerator for the organic Rankine cycle (ORC) system,the aerostatic bearings with R245fa as the lubricating medium was designed by gauge pressure ratio method,and the effects of rotor eccentricity,orifice size and inlet pressure on the load carrying capacity and stiffness of the aerostatic bearings were analyzed.The results show that the bearing load capacity and stiffness increase with the increase of speeds under the same air supply pressures.At the same speed,the load capacity and stiffness of the bearing at the air supply pressure of 0.7 MPa is slightly higher than those at other air supply pressures.The greater the eccentricity of the aerostatic bearings,the greater the load carrying capacity.The load carrying capacity and stiffness of the aerostatic bearings increases with the increase of rotational speeds under the same air supply hole diameter.The larger the air supply hole diameters,the greater the bearing capacity and stiffness of the aerostatic bearings.