Abstract: The transfer matrix of the plate by the action of liquid was derived.The critical rotational speed of the turbopump rotor possessing three plates,two supports and single shaft was calculated.The frequency spectrum and the critical rotational speed were compared in regard to and without regard to the liquid action.The results show that there is essential distinction between the frequency spectrums in two conditions.The liquid action on pump wheel obviously influences the critical rotation speed of the rotor

Key words: Liguid propellant rocket engine;Turbine rotor;Rotor speed;Transfer matrix method +;Numerical simulation

摘要： 给出了有液体作用时盘的传递矩阵，然后计算了三盘双支承同轴涡轮泵转子的临界转速，对计入和不计入液体作用时的频率谱和临界转速值作了比较，结果表明频率谱有质的区别，液体对泵轮的作用显著影响转子的临界转速值

关键词: 液体推进剂火箭发动机;涡轮转子;转子速度;传递矩阵法;数值仿真