To provide a stationary blade structure that has a simple configuration for reducing exciting force acting on a moving blade at a specific frequency by changing stationary blade post-flow frequencies at the root and tip of the moving blade, and lowering resonant stress even when a stationary blade post-flow frequency and a moving blade post-flow frequency coincide with each other.
The axial-flow turbomachine includes a stage structure formed by combining a stationary blade row 3 secured in a casing and a moving blade row 4 fixed to a rotor. Stationary blades that constitute the stationary blade row 3 installed on an upstream side in a flow direction of working fluid of the moving blade row 4 have a structure in which the number of blades is different at a tip and at a root in a radial direction.
YAMASHITA MINORU
Yuji Toda
Shigemi Iwasaki