Numerical analysis of a tip labyrinth seal of high rotating rotor

Labyrinth seal constantly is a prime turbine sealing solution because of low price, low maintenance, minimal rub particulate contamination and high temperature capability. This work aims to perform detailed CFD investigation of high speed rotating labyrinth seal. There have been found an impact of rotational velocity and pressure ratio on discharge characteristics of the rotor. Discharge characteristics were calculated for variety of pressure ratios. Moreover influence of rotor roughness was shown in each case. Performed inquiry results were shown as relative mass flow rate in function of mentioned parameters. From variety of configurations, an optimal seal configuration – providing the lowest leakage can be found.