Effect of Fin Position on the Dynamic Characteristics of Double Strip Labyrinth Seal
Effect of Fin Position on the Dynamic Characteristics of Double Strip Labyrinth Seal
复制标题
翅片位置对双条迷宫密封动态特性的影响
DOI：
10.1299/kikaic.78.3730
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Kudo
中科院分区：
文献类型：
--
作者：
A. Endo;K. Yamaguchi;N. Nishijima;K. Murata;T. Kudo
迷宫密封的流体力会引起汽轮机转子的不稳定振动。利用试验台对双条迷宫密封的动态特性进行了测试。转子-轴承系统由软笼弹簧支撑，并使用磁轴承进行激励。交叉耦合刚度计算和评价的密封的不稳定的动态特性。实验和计算结果表明，交叉耦合刚度随转速的增加而增加。否则，当压差增大时，交叉耦合刚度减小。双条迷宫密封的不稳定流体力取决于动、静叶片的轴向位置。当转子与定子雅阁位置一致时，上游空腔产生不稳定力，下游空腔产生稳定力。当翅片位置雅阁时，双条迷宫密封的上游有更好的稳定效果。
The fluid force of labyrinth seals may cause unstable rotor vibrations in turbo-machineries. In this research, dynamic characteristics of double strip labyrinth seals were measured by using a test rig. The rotor-bearing system was supported by soft cage springs, and it was excited using a magnetic bearing. Cross-coupled stiffness was calculated and evaluated as unstable dynamic characteristics of the seals. Experimental and calculation results showed cross-coupled stiffness increased, when the rotating speed increased. Otherwise cross-coupled stiffness decreased, when the differential pressure increased. Unstable fluid force of double strip labyrinth seal depends on axial fin position of rotor and stator. When fin position of rotor accord with stator, unstable force arose from upstream cavity and stable force arose from downstream cavity. Upstream of double strip labyrinth seal had a more stabilizing effect, when fin position accord.