Conceptual Flutter Analysis of Labyrinth Seals Using Analytical Models—Part II: Physical Interpretation

  1. Corral, Roque 12
  2. Vega, Almudena 2
  1. 1 Advanced Engineering Direction, Industria de Turbopropulsores S.A.U., Madrid
  2. 2 Universidad Politécnica de Madrid
    info

    Universidad Politécnica de Madrid

    Madrid, España

    ROR https://ror.org/03n6nwv02

Revista:
Journal of Turbomachinery

ISSN: 0889-504X,  1528-8900

Año de publicación: 2018

Volumen: 140

Número: 12

Tipo: Artículo

DOI: 10.1115/1.4041377 GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Journal of Turbomachinery

Resumen

The dimensionless model presented in part I of the corresponding paper to describe the flutter onset of two-fin rotating seals is exploited to extract valuable engineering trends with the design parameters. The analytical expression for the nondimensional work-per-cycle depends on three dimensionless parameters of which two of them are new. These parameters are simple but interrelate the effect of the pressure ratio, the height, and length of the interfin geometry, the seal clearance, the nodal diameter (ND), the fluid swirl velocity, the vibration frequency, and the torsion center location in a compact and intricate manner. It is shown that nonrelated physical parameters can actually have an equivalent impact on seal stability. It is concluded that the pressure ratio can be stabilizing or destabilizing depending on the case, whereas the swirl of the flow is always destabilizing. Finally, a simple method to extend the model to multiple interfin cavities, neglecting the unsteady interaction among them, is described.

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