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2 Polish Maritime Research

2 2009

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Remarks on aerodynamic forces in seals of turbine stages

Stępień R., Kosowski K.

Polish Maritime Research

2009

S 1

58-63

This paper presents results of numerical examination of flow through over-shroud seals of turbine stages. Various labyrinth seals of different configurations and number of sealing teeth were considered. It was demonstrated that results of investigations of isolated seals cannot be directly used for analyzing turbine stage operation. Such approach may lead to relatively large errors in determining value of aerodynamic force and direction of its action.

On the modelling of aerodynamic force coefficients for over-shroud seals of turbine stages

Włodarski W., Kosowski K.

Polish Maritime Research

2009

S 1

71-74

This paper presents experimental investigations which made it possible to determine dynamic coefficients of labyrinth over-shroud seal of a model air turbine. The coefficients associate pressure forces with turbine rotor displacement, velocity and acceleration respective to turbine casing (linear model) and play important role in analyzing turbine-set dynamics. The obtained results indicated that involving serious errors can be expected in the case of application of the simplification consisting in neglecting inertia coefficients, proposed in the literature. It was simultaneously demonstrated that seals can be also met of weak damping qualities, for which to neglect damping coeffcients is allowable.