Numerical study on the generation mechanism of temperature variation effect of static labyrinth seals
Theoretical analysis and numerical calculation methods were used to systematically study the generation mechanism and influencing factors of the temperature variation effect of the static labyrinth seals.A theoretical analysis of the temperature variation effect of the static labyrinth seals was carried out,and a numerical solution model based on the RNG(renormalization group)k-ε turbulence equation was established.The temperature variation effect of static labyrinth seals was studied,the influence of pressure ratio and relative seal clearances on the temperature variation effect was analyzed,and the generation mechanism of the temperature variation effect of static labyrinth seals was revealed.The results showed that the temperature of the gas flowing through the seal clearances first decreased and then increased,and the temperature increased from the center of the swirl to the outer edge,and the temperature of the gas near the wall of the labyrinth cavity increased.The local gas temperature of the labyrinth seals increased or decreased,and the overall temperature decreased along the axial direction;the temperature of the static labyrinth seals gas decreased with the increase of the pressure ratio and the relative seal clearances.When the pressure ratio was 1.6 and the relative seal clearances was 1.6,the temperature drop was at most 4.70 K;the temperature variation effect of the static labyrinth seals was mainly caused by its throttling effect,thermodynamic effect and friction effect.Due to the throttling effect in the clearances,the molecular kinetic energy of the gas decreased.In the labyrinth cavity,due to the thermodynamic effect,the kinetic energy of the center of the swirl was transferred to the outer edge of the swirl.Due to the friction effect on the near wall of the labyrinth cavity,the kinetic energy of the gas was converted into heat energy.The research results provide a theoretical basis for the thermal analysis of the airflow in the labyrinth seals clearances.
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