The Benefits of Compliancy
Over time, labyrinth seal clearances are compromised through erosion and material removal, which can stem from factors such as:
- Rotor-stator interaction (due to high imbalance loading)
- Transient excursions (due to asymmetric thermal growth between the rotor and casing)
In addition, since labyrinth seals are rigid geometry seals and are not capable of bending to accommodate rotor excursions, design clearances are engineered to account for all phenomena affecting clearance closures in the machine.
The brush seal’s compliancy – its ability to bend – allows sealing clearances to be significantly reduced, thus increasing machine efficiency and power.