Leakage reduction by optimisation of the straight-through labyrinth seal with a honeycomb and alternative land configurations

The results of individual optimisation tasks are presented and discussed, and the potential for improvement in the seal efficiency by means of appropriate selection of both the labyrinth parameters and the type of the land is pointed out. The obtained values of the reduction in the discharge coefficient reach 18% compared to the reference labyrinth configuration. However, taking account of both the labyrinth and the land shape, the benefit of 22.4% is achieved in comparison to the reference configuration with a honeycomb land.