TURBINE STATIONARY BLADE AND GAS TURBINE

To improve durability of a turbine stationary blade.SOLUTION: A turbine stationary blade according to one embodiment comprises: an airfoil part; an inner shroud; a pair of peripheral wall parts extending along an extension direction of ends on one side and the other side of a circumferential direction of the inner shroud; a vertical wall part extending in the circumferential direction, having the ends on the one side and the other side of the circumferential direction connected to the pair of peripheral wall parts, and projecting from the inner shroud; a connection part connecting the pair of peripheral wall parts and the vertical wall part by a smooth curve surface; and a first plate member forming a cavity by an opposite side face of the inner shroud and the pair of peripheral wall parts. The first plate member has a first plane part along the pair of peripheral wall parts, a second plane part along the vertical wall part, and a curve part along the connection part. The curve part includes a thick part thicker than thickness of the first and second plane parts at least at the ends on the one side and the other side in the circumferential direction.SELECTED DRAWING: Figure 7 【課題】タービン静翼の耐久性を向上させる。【解決手段】本開示の少なくとも一実施形態に係るタービン静翼は、翼形部と、内側シュラウドと、内側シュラウドにおける周方向の一方側及び他方側の端部において端部の延在方向に沿って延在する一対の周壁部と、周方向に延在していて周方向の一方側及び他方側の端部が一対の周壁部に接続されていて、内側シュラウドから突出する縦壁部と、一対の周壁部と縦壁部とをなだらかな曲面で接続する接続部と、内側シュラウドの反対側の面、及び、一対の周壁部と共に、キャビティを形成する第１板部材とを備える。第１板部材は、一対の周壁部に沿った第１平面部と、縦壁部に沿った第２平面部と、接続部に沿った曲面部とを有する。曲面部は、少なくとも周方向の一方側及び他方側の端部において第１平面部及び第２平面部の厚さよりも厚い厚肉部を含む。【選択図】図７