US 12,228,050 B2
Steam turbine, blade, and method for improving performance and reliability of steam turbine
Shigeki Senoo, Tokyo (JP); Soichiro Tabata, Yokohama (JP); Tetsuya Sawatsubashi, Tokyo (JP); Hiroyuki Mitsui, Tokyo (JP); Kunio Asai, Tokyo (JP); Ryuichi Matsubara, Tokyo (JP); and Kiyoshi Tatsuhara, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on Sep. 13, 2022, as Appl. No. 17/943,696.
Application 17/943,696 is a continuation of application No. PCT/JP2021/013492, filed on Mar. 30, 2021.
Claims priority of application No. 2020-062296 (JP), filed on Mar. 31, 2020.
Prior Publication US 2023/0017038 A1, Jan. 19, 2023
Int. Cl. F01D 5/28 (2006.01); F01D 25/24 (2006.01)
CPC F01D 5/288 (2013.01) [F01D 25/24 (2013.01); F05D 2220/31 (2013.01); F05D 2230/90 (2013.01); F05D 2300/611 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A steam turbine comprising:
a shaft that rotates around a rotation axis;
a plurality of rotor blades that extend in a radial direction from an outer peripheral surface of the shaft and are arranged in a circumferential direction;
a casing main body that covers the shaft and the rotor blade from an outer peripheral side;
a plurality of stator blades that extend in the radial direction from a position on an upstream side of the rotor blade on an inner peripheral surface of the casing main body and are arranged in the circumferential direction; and
a substance supply unit that supplies, to a surface of at least one of the rotor blade and the stator blade, a film forming substance having hydrophobicity to water droplets adhering to the surface,
wherein the substance supply unit includes
a storage portion that stores the film forming substance,
a supply flow path which is formed inside the casing main body and through which the film forming substance guided from the storage portion flows, and
a discharge unit that is formed inside the at least one of the rotor blade and the stator blade and guides the film forming substance to the surface of the at least one of the rotor blade and the stator blade, and
wherein the discharge unit includes a plurality of outlets arranged on a leading edge side on a pressure surface of the at least one of the rotor blade and the stator blade at intervals in the radial direction.