TRANSONIC BLADE

摘要

An object of the present invention is to provide a transonic blade that concurrently achieves a reduction in shock loss at a design point and an improvement in stall margin in blades operating in a flow field of transonic speed or higher in an axial-flow rotating machine. To achieve the above object, the present invention provides a transonic blade used in a flow field through which an overall or partial flow passes at a transonic speed or higher. The transonic blade is formed as below. A cross-sectional surface at each of spanwise positions of the blade is shifted parallel to a stagger line 38 connecting a leading edge 34 with a trailing edge 35 of the blade. A stacking line 36 is shifted toward an upstream side of working fluid. The stacking line 36 connects together respective gravity center positions of blade cross-sectional surfaces at spanwise positions in a range from a hub cross-sectional surface 31 joined to a rotating shaft or an outer circumferential side casing of a rotating machine to a tip cross-sectional surface 33 lying at a position most remote from the hub cross-sectional surface in a spanwise direction. A maximum thickness position of the cross-sectional surface of the blade at each of the spanwise positions is shifted toward a trailing edge side of the blade in a range from the hub cross-sectional surface 31 to the tip cross-sectional surface 33.