Abstract
Labyrinth seal is a device that reduces leakage flow between rotating and stationary structures by placing a number of tooth. In this paper, the published literature on the labyrinth seal since 1960s was reviewed and summarized. The labyrinth seals were classified according to their configurations into straight solid, stepped solid, straight honeycomb, and stepped honeycomb seals. In the early years, only experimental techniques were used. However, since the 2000s, PIV(Particle Image Velocimetry), LDV(Lase Doppler Velocimerty), and computational analytical techniques were performed in parallel to measure local pressure and flow field. Various correlations for labyrinth seals were presented and effects of seal parameters on the leakage flow were also discussed. Overall, the leakage flow was mainly influenced by the number of teeth, seal clearance, tooth tip thickness and front inclination angle.
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