Stator vane for steam turbine, steam turbine, and method for heating stator vane for steam turbine

A stator vane for a steam turbine, comprising:

• a vane body having an airfoil cross section including a pressure-side partition wall having a concave surface shape and a suction-side partition wall having a convex surface shape, the vane body having a hollow section formed between an inner surface of the pressure-side partition wall and an inner surface of the suction-side partition wall;
• and
• a first division wall dividing the hollow section into a first hollow section positioned at a leading edge side and a second hollow section positioned at a trailing edge side,
• wherein the first hollow section is configured to be a closed space, and a slit is formed on at least one of the pressure-side partition wall or the suction-side partition wall, the slit being in communication with the second hollow section.

A method of heating a stator vane for a steam turbine, comprising:

• a preparation step of placing, in a steam flow passage of a steam turbine, a stator vane for a steam turbine comprising a vane body having an airfoil cross section including a pressure-side partition wall having a concave surface shape and a suction-side partition wall having a convex surface shape, the vane body having a hollow section formed between an inner surface of the pressure-side partition wall and an inner surface of the suction-side partition wall;
• and a first division wall dividing the hollow section into a first hollow section positioned at a leading edge side and a second hollow section positioned at a trailing edge side, wherein a slit is formed on at least one of the pressure-side partition wall or the suction-side partition wall, the slit being in communication with the second hollow section;
• and
• a heating step of supplying a heating liquid to the first hollow section.