关键词: 液体推进剂火箭发动机;涡轮泵;涡轮转子;稳定性计算

Abstract: Fluid seals and excitations induced by impeller eccentric clearance are the main factors to determine rotor stability in turbopumps with the increase of pressure and rotor speed. Stiffness and damping coefficients for high pressure annular seals were calculated by use of the expressions derived by Childs D. W.et al. The whole transfer matrix method was used to compute the turbopump rotor system stability resulted from the effects of annular seals and Alford force. The numerical results show that the rotor stability can be enhanced by increasing the damping of bearings and the antiwhirl at seal entrance.

Key words: Liquid propellant rocket engine;Turbine pump;Turbine rotor;Stability calculation