TURBINE BLADE AND STEAM TURBINE HAVING THE SAME

To provide a turbine blade capable of reducing a loss which may occur resulting from a leakage flow, and a steam turbine having the same.SOLUTION: A turbine blade comprises an airfoil part having a pressure face and a negative pressure face extending between a front edge and a rear edge, and a platform including an end wall to which a base end part of the airfoil part is connected. The end wall includes at least a negative pressure face-side recess located in a negative pressure face-side region of the end wall, and at least a pressure face-side protrusion located in a pressure face-side region of the end wall, the negative face-side recess has the negative pressure face and a bottom point located at an upstream side rather than a contact point extending in an axial direction of the negative pressure face in the axial direction, in one or more contours on the negative pressure face-side recess of the end wall, a normal vector in a cross point between the negative pressure face and the contour having a negative gradient along a normal line of the contour is oriented toward the airfoil part, and the pressure face-side protrusion has an apex located at a downstream side rather than the contact point in the axial direction.SELECTED DRAWING: Figure 5 【課題】漏れ流れに起因して生じ得る損失を低減可能なタービン翼及びこれを備えた蒸気タービンを提供する。【解決手段】タービン翼は、前縁と後縁との間において延在する圧力面及び負圧面を有する翼型部と、前記翼型部の基端部が接続されるエンドウォールを含むプラットフォームと、を備え、前記エンドウォールは、少なくとも前記エンドウォールの負圧面側領域に位置する負圧面側凹部と、少なくとも前記エンドウォールの圧力面側領域に位置する圧力面側凸部と、を含み、前記負圧面側凹部は、前記負圧面と、該負圧面の軸方向に延びる接線との接点よりも軸方向上流側に位置する底点を有し、前記エンドウォールの前記負圧面側凹部上の１本以上の等高線は、前記負圧面と前記等高線との交点における、前記等高線の法線に沿った負の勾配を有する法線ベクトルが前記翼型部を向くとともに、前記圧力面側凸部は、前記接点よりも軸方向下流側に位置する頂点を有する。【選択図】 図５