Experimental Study on a Typical Labyrinth Sealing Characteristics in Gas Turbine Engines
The labyrinth sealing characteristics have a significant impact on the operational efficiency and power consump-tion of gas turbine engines.This study focuses on the typical labyrinth structure with straight-through and oblique toothtype.Then,experimental measurement methods were employed to reveal the influence of labyrinth sealing clearances on leakage,temperature rise,and swirl characteristics at different rotational speeds and pressure ratios of the labyrinth sealing.The study also quantitatively assessed the extent of the impact of rotational speed,pressure ratio and sealing clearances on the sealing characteristics.The results indicate that,within the experimental operating range,the leakage of the labyrinth ranged from 0.0358 to 0.2010 kg/s,the temperature rise of the labyrinth ranged from 2.8 to 21.2 K,and the swirl ratio at the outlet of the labyrinthcavity ranged from 0.23 to 0.42.The clearances and pressure ratios oflabyrinthexhibit significant sensitivity to labyrinth sealing leakage.The sensitivity ofsystem pressure ratio,clearances,and rotational speed of labyrinth to the temperature rise characteristics of labyrinth increases sequentially.Especially,the effect of rotational speed has the greatest sensitivity to the swirl flow characteristics inside the labyrinth cavity.The research results provide engineering reference for the design of labyrinth seal.
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