Patent ID: 8133012

Claim:
A transonic airfoil operating in a flow region of a transonic or faster operating fluid, the transonic airfoil comprising: a hub located close to a connection position to a rotation shaft; a midportion located at a medium position in a radial direction which is a radial direction of the rotation shaft; a tip located farthest from the rotation shaft in the radial direction; a leading edge located on an upstream of the inflowing operating fluid; and a trailing edge located on a downstream of the operating fluid; wherein sectional profiles stacked in the radial direction of the airfoil are continuously shifted in parallel to a first direction connecting the leading edge and the trailing edge, further wherein the sectional profiles close to the tip and the sectional profiles between the midportion and the hub are shifted to the upstream of the first direction to form an S shape, and the shift amount of the sectional profiles close to the tip in the first direction is greater than the shift amount of the sectional profiles between the midportion and the hub in the first direction.