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为了确定阻尼器油膜边界条件对离心机升速过程中的振动特性的影响,借鉴Muszynska油膜模型,对离心机阻尼器油膜边界进行了改造。通过有限体积数值计算对新结构可能对阻尼器油膜流场带来的影响进行了分析。设计制作出了一种新型油膜阻尼器并应用于超临界离心机实验,验证了其在离心机转子支承系统过挠性临界过程中对降低系统的振动和不稳定性的明显作用。过挠性临界过程中,阻尼器的振动振幅由15μm有效减小到了1μm。结果显示出特殊油膜结构在离心机阻尼器的设计中的有效性和重要研究价值。
In order to determine the influence of the boundary conditions of damper oil film on the vibration characteristics of the centrifuge in the process of accelerating, the Muszynska oil film model was rebuilt to modify the boundary of the damper oil film. The influence of new structure on the flow field of damper oil film is analyzed by finite volume numerical calculation. A new type of oil film damper was designed and applied to the experiment of supercritical centrifuge, which verified the obvious effect of reducing the vibration and instability of the system in the over-critical process of centrifuge rotor bearing system. During the flexible critical process, the vibration amplitude of the damper is effectively reduced from 15μm to 1μm. The results show the effectiveness and important research value of the special oil film structure in the design of centrifugal damper.