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16 June 2023 LH2 turbopump rotor dynamic characteristics under the nonlinear fluid force of labyrinth seal
Li Jinkuan, Jialei Du, Wenlong Yue, Xuqiang Jiang
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Proceedings Volume 12639, Third International Conference on Mechanical Design and Simulation (MDS 2023); 1263927 (2023) https://doi.org/10.1117/12.2682008
Event: Third International Conference on Mechanical Design and Simulation (MDS 2023), 2023, Xi'an, China
Abstract
Sub synchronous vibration problems occurred many times during the development and production of liquid hydrogen (LH2) turbopump for a certain type liquid hydrogen-oxygen (LOX/LH2) rocket engine. The results show that nonlinear excitation force at labyrinth seal may be the main reason of sub synchronous vibration. In order to obtain the effect of seal force acting on rotor system, and to provide theoretical support for design and improvement of LH2 turbopump. In this paper, mathematical model of LH2 turbopump rotor system and seal fluid force is established, coupled by MATLAB program. Then we realized the rotor system steady and transient state calculation. Results show that a kind of vibration which frequency near the first natural frequency will be induced by labyrinth seal fluid force. Increasing seal clearance can improve the stability and the critical speed margin of LH2 turbopump rotor system. But it will also increase the amplitude of vibration, and the ratio of displacement to seal clearance, which is harmful to avoid the phenomenon of friction. The relationship between inlet preswirl and stability of rotor system presents obvious nonlinear characteristics, so needs more attention during design and choose the optimal value.
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Li Jinkuan, Jialei Du, Wenlong Yue, and Xuqiang Jiang "LH2 turbopump rotor dynamic characteristics under the nonlinear fluid force of labyrinth seal", Proc. SPIE 12639, Third International Conference on Mechanical Design and Simulation (MDS 2023), 1263927 (16 June 2023); https://doi.org/10.1117/12.2682008
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KEYWORDS
Vibration
Mathematical modeling
Fluid dynamics
Rockets
Turbines
Motion analysis
Finite element methods
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