Hydrostatic seal and back-up seal of a gas turbine engine

摘要

Gas turbine engine systems involving hydrostatic face seals (150) with back-up seals (170) are provided. In this regard, a representative seal assembly for a gas turbine engine includes: a hydrostatic seal (150) having a seal face (152) and a seal runner (154); and a back-up seal (170); wherein; in a normal mode of operation of the hydrostatic seal (150), interaction of the seal face (152) and the seal runner (154) maintains a pressure differential within the gas turbine engine and, in a failure mode of operation of the hydrostatic seal (150), the back-up seal (170) maintains a pressure differential within the gas turbine engine.