COMPRESSOR CASING FOR A GAS TURBINE ENGINE

摘要

The present invention relates to a compressor casing for a gas turbine engine in which an inner casing is radially adjustable so as to maintain a radial clearance between the casing and a rotor as the rotor undergoes radial expansion and contraction. The compressor casing has an outer casing and a concentrically arranged inner casing with a plurality of generally radially extending arms interconnecting the inner and outer casings. The volume between the casings is sealed so as to form a chamber and heated air bled from a downstream stage of the compressor is directed into this chamber such that the heated air contacts the exterior surfaces of the hollow radial arms. The invention also has a system for supplying cooling air to the interior of each of the radial hollow arms including a regulating device so that the cooling air can be selectively applied to the arms.