J1030101 Rotordynamic Characteristics of Segmented Seal under Whirling Motion

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  • J1030101 ロータのふれまわり運動下におけるセグメントシールの動特性

Description

Rocket turbopump is high-speed, high-power turbomachinery that has often suffered from rotor vibration problems. A circumferential hydrodynamic segmented seal (segment seal) is often applied to completely separate the turbine from the pump in the rocket turbopump. It is important to elucidate the effect of the rotordynamic fluid force of the segment seal on the rotor vibration. However, the effect has never been examined. The purpose of this study is to clarify the rotordynamic characteristics of the segment seal and the impact of this force on rotor vibration. The experimental results of the rotordynamic fluid force of the segment seal under whirling motion of the rotor are reported in this paper. Experiments were conducted by using the rotordynamic test stand of JAXA (JARTS) with active magnetic bearings. It was found that the rotordynamic fluid force of the segment seal has positive influence for stability of the rotor because the radial forces had a restoring effect and the tangential forces had a damping effect. The damping effect will be generated by the friction force on the secondary sealing surface and the squeeze effect.

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