Patent ID: 8734095

Claim:
A gas turbine comprising: an n-th stage stator blade having a plurality of stator-blade segments extending in a radial direction and provided at a predetermined pitch in a circumferential direction, n being a positive integer; an n-th stage rotor blade disposed at a downstream side of the n-th stage stator blade in a direction of flow of combustion gas, the n-th stage rotor blade having a plurality of rotor-blade segments extending in the radial direction and provided around an outer periphery of a rotor at a predetermined pitch in the circumferential direction; an (n+1)-th stage stator blade disposed at the downstream side of the n-th stage rotor blade in the direction of flow of the combustion gas, the (n+1)-th stage stator blade having a plurality of stator-blade segments extending in the radial direction and provided at a predetermined pitch in the circumferential direction; and an (n+1)-th stage rotor blade disposed at the downstream side of the (n+1)-th stage stator blade in the direction of flow of the combustion gas, the (n+1)-th stage rotor blade having a plurality of rotor-blade segments extending in the radial direction and provided around the outer periphery of the rotor at a predetermined pitch in the circumferential direction, wherein a blade-count difference between the stator-blade segments of the n-th stage stator blade and the stator-blade segments of the (n+1)-th stage stator blade is set to zero or to five or more, and/or a blade-count difference between the rotor-blade segments of the n-th stage rotor blade and the rotor-blade segments of the (n+1)-th stage rotor blade is set to zero or to five or more, and wherein a relative position between the n-th stage stator blade and the (n+1)-th stage stator blade in the circumferential direction is set such that a wake flow produced by the stator-blade segments of the n-th stage stator blade is guided to a ±¼ pitch region in the circumferential direction with respect to a leading edge of each stator-blade segment of the (n+1)-th stage stator blade and within a range of 0% to 15% and/or a range of 85% to 100% of the length in a span direction from a hub side of the stator-blade segment of the (n+1)-th stage stator blade, one pitch being equal to a distance between adjacent stator-blade segments in the circumferential direction.