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为了研究转子振动与转子密封之间的相互作用及影响,本文对两种环形转子密封的流动特性以及其所对应的转子的动力学特性进行了数值计算。首先提出了一种计算转子动力学参数的数值方法,可以求解转子的振幅和振频。之后这些参数可以作为非稳态条件应用于流体数值计算中。数值分析的结果表明,转子的振动能够降低密封的性能并且引起额外的转子气体力。通过深入的分析证实了该气体力总是趋向于降低转子的自激振动,并且随着压差的增大这种效应更加明显。关于上述现象在两种转子密封中的异同在本文中给出了说明。最终得出结论:适当结构的迷宫、蜂窝密封或者其二者的组合是完全有可能降低转子自激振动带来的负面影响的。
In order to study the interaction and influence between rotor vibration and rotor seal, this paper numerically calculates the flow characteristics of the two ring rotors and their corresponding rotor dynamics. Firstly, a numerical method for calculating rotor dynamic parameters is proposed, which can solve the rotor’s amplitude and vibration frequency. These parameters can then be applied to fluid numerical calculations as unsteady conditions. Numerical analysis of the results show that the vibration of the rotor can reduce the performance of the seal and cause additional rotor gas force. Through in-depth analysis confirmed that the gas force tends to reduce the self-excited vibration of the rotor, and with the pressure difference increases this effect more pronounced. The similarities and differences of the above two phenomena in the rotor seal are given in this paper. The conclusion is finally reached: Appropriately structured labyrinths, honeycomb seals, or a combination of both, are entirely possible to reduce the negative effects of rotor self-excited vibration.