Mitsubishi Heavy Industries Compressor Corporation

Yuki Nakamura

Nobuyori Yagi

Shin Yanagisawa

Yuichi Sasaki

Naoyuki Nagai

Kyoichi Ikeno

Yuzo Tsurusaki

A turbine rotor blade assembly in which values A, CF, T, and L are set to satisfy the following expression in two-dimensional coordinates, 1.2&#xd7;10&#x2264;(A&#xd7;CF)/(T&#xd7;L)&#x2264;17&#xd7;10, where (A&#xd7;CF)/(T&#xd7;L) is an expression (1), A is an arm length [mm] of each of turbine rotor blades, CF is centrifugal force [kgf] occurring on each of the turbine rotor blades, T is a thickness [mm] of each of shrouds, and L is a lap amount [mm] of the shrouds adjacent to each other.

Turbine rotor blade assembly

A method for measuring a pre-twist amount of a blade includes a spreading dimension acquiring step, a misalignment acquiring step, a correcting step, and a pre-twist amount acquiring step. In the spreading dimension acquiring step, circumferential spreading dimensions of each shroud of two rotor blades are acquired. In the misalignment acquiring step, a misalignment amount in the direction of the axis between the shrouds of two rotor blades adjacent to each other in the circumferential direction is measured. In the correcting step, the spreading dimension acquired in the spreading dimension acquiring step is corrected on the basis of the misalignment amount acquired by the misalignment acquiring step. In the pre-twist amount acquiring step, the pre-twist amount of the blade is acquired on the basis of the spreading dimension corrected in the correcting step.

Method for measuring pre-twist amount of blade, and method for manufacturing rotor

In a turbine rotor blade assemblyof the present invention, each turbine rotor bladeincludes a platformhaving a blade rootfixed to a turbine disk, a profilerising from the platform, and a shroudprovided at a top end of the profile. The shroudof the present invention includes a first contact end partthat comes into contact with an adjacent shroud adjacent to one end side in a circumferential direction, a second contact end partthat comes into contact with an another adjacent shroud adjacent to the other end side in the circumferential direction, and a main body part disposed between the first and second contact end partsand. One or both of the first and second contact end partsandare lower in rigidity than the main body part.

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Hiroshima, Japan

Yuki Nakamura