Axial flow compressor, gas turbine equipped with axial flow compressor, and method for remodeling axial flow compressor

摘要

An axial compressor includes: a rotor 19 as a rotational shaft; a plurality of rotor blades mounted on the rotor 19; a compressor casing 20 that covers the rotor and the rotor blades; a plurality of stator vanes 221, 222 mounted on the compressor casing 20. The rotor blades and the stator vanes 221, 222 are each disposed in a circumferential direction of the rotational shaft to form a rotor-blade cascade 17 and a stator-vane cascade 18, respectively. The rotor-blade cascade 17 and the stator-vane cascade 18 are arranged in plural rows, respectively, in an axial direction of the rotational shaft. The stator vane 221, 222 has a dovetail 50 as a base for supporting a vane section. The compressor casing 20 has a dovetail groove 51 formed therein. The dovetail groove 51 extends in the circumferential direction of the rotational shaft to receive the dovetail 50 inserted therein to fix the stator vanes 221, 222. Two or more stator vanes, the stator vanes belonging to stator-vane cascades different from each other, are fixed in the dovetail groove 51.