Abstract:Taking the staggered labyrinth seal configuration of reciprocating compressor as research objective,the internal flow field and structure deformation for different tooth profile angle were solved synchronously using Fluent software,and the effect of tooth profile angle on the performance of labyrinth seal under fluidstructure interaction was analyzed.The results indicate that,with the increase of the angle of seal teeth,the leakage rate of labyrinth seal presents the trend of first decrease and then increase.When the tooth profile angle is 30°,the labyrinth seal has the strongest vortex in expansion cavity,the most complete energy loss,and therefore has the best sealing performance.The interaction between flow field and structure has an influence on the distribution of flow field,thus affects the fluid leakage.Therefore the result by fluidstructure interaction analysis method is closer to the theoretical value than that by fluid model,and the 3D simulation by fluidstructure interaction analysis method is closer to the engineering practice.