To provide a blade row structure of an axial-flow turbomachine with a simple structure which can reduce an exciting force acting on a moving blade at specific stationary blade post-flow frequencies, and decrease a resonant response even when the stationary blade post-flow frequency and a moving blade natural vibration frequency coincide with each other without reducing stage structure efficiency.
An axial-flow turbomachine including a stage structure having a stationary blade row comprising a plurality of stationary blades 3 provided in a circumferential direction, and a moving blade row comprising a plurality of moving blades 4 provided in the circumferential direction on a downstream side of a flow direction of a working fluid of the stationary blades. The stationary blades 3 configuring the stationary blade row are arranged to differ axial positions of stationary blade trailing edges in the circumferential direction so that stationary blade post-flow pitches 14 in a moving blade front edge line 15 are not uniform.
YAMASHITA MINORU
Yuji Toda
Shigemi Iwasaki