Stator blade (50) provided in a gas
turbine (10), comprising: a blade body (51) having a blade shape in cross-section and extending in a blade height direction (Dh) having a directional component perpendicular to the cross-section; a first insert (90) and a second insert (95) having a tubular shape, extending in a tube height direction and arranged within the blade body (51) such that the tube height direction faces the blade height direction (Dh); and an end cover (100), wherein the blade body (51) includes several blade air channels (80) extending in the blade height direction (Dh) within the blade body (51), of which several blade air channels a first blade
air channel (81) and a second blade
air channel (85) each have a first blade height side (Dh1) and a second blade height side (Dh2),wherein one end is open at the first blade height side (Dh1) of the first blade
air channel (81), and one end is open at the second blade height side (Dh2) of the second blade air channel (85), each of the first insert (90) and the second insert (95) comprising: an outer circumferential plate section (91, 96) having a tubular shape and extending in the tube height direction, and a sealing plate section (93, 98) closing one end on a tube height sealing side which is a side of the outer circumferential plate section from two sides in the tube height direction, the outer circumferential plate section (91) of the first insert (90) is closed at the second blade height side (Dh2) by the sealing plate section (93), the outer circumferential plate section (96) of the second insert (95) is closed at the first blade height side (Dh1) by the The sealing plate section (98) is closed, the outer perimeter plate section has several
impact holes (92),which penetrate from an inside to an outside of the tubular outer circumferential plate section, the outer circumferential plate section (91) of the first insert (90) has a gap that is present between the outer circumferential plate section (91) of the first insert (90) and a first channel-defining surface of the blade body, which defines the first blade air channel (81), and is arranged within the first blade air channel (81), such that cooling air (Ac) flows from an opening (90o) of the first insert (90) into the outer circumferential plate section (91), the outer circumferential plate section (96) of the second insert (95) is configured such that the tube-height opening side of the second insert (95) faces the second blade height side (Dh2), a gap that is present between the outer circumferential plate section (96) of the second insert (95) and a second channel-defining surface of the blade body (51) is present,which defines the second blade air channel (85), has and is arranged within the second blade air channel (85) such that cooling air (Ac) flows from an opening (95o) of the second insert (95), and the end cover is provided on the second blade height side (Dh2) of the blade body (51) such that the cooling air (Ac) which is expelled from the multiple
impact holes (92) of the first insert (90) between the outer circumferential plate section (91) of the first insert (90) and the first channel-defining surface (81p) is directed from the opening (95o) of the second insert (95) through the opening (90o) of the first blade air channel (81) into the second insert (95), and covers the opening of the first blade air channel (81) and the opening (95o) of the second insert (95).