部分充液悬臂转子在不稳定区的动力特性

 描述了试验中部分充液转子系统在失稳过程中的动力特性,注意了转子在不稳定区的涡动频率和方向,流体表面的状态与转子失稳之间的关系;研究了充液量对转子的涡动频率和不稳定区的影响。报道了部分充液转子系统在失稳过程中的一些重要现象,为深入研究部分充液转子系统失稳机理提供了实验依据。

DYNAMIC BEHAVIOUR OF A ROTOR PARTIALLY FILLED WITH FLUID IN THE UNSTABLE REGION

The whirling behaviour of an over\|hung rotor partially filled with fluid in the unstable region is investigated experimentally. Specific attention is paid to the developing process of the rotor instability, the whirling frequency and direction within the unstable region, the fluid free surface characteristics and the dynamical behaviour of the rotor system while the instability occurs. The effects of the fluid fill ratio on the whirling frequency and the unstable region are also studied. The results clarify many issues and show many new phenomena about the instability of the rotor partially filled with fluid for the first time. These new phenomena include the subsynchronous frequency occurring before the instability which does not result in the instability of the rotor system and disappears in the unstable speed region at large fluid fill ratios, different whirling frequencies existing in the unstable region between the slowing increasing and decreasing speed operation, the breaking\|down phenomenon of the fluid free surface and the chaotic motion.