Patent ID: 8425185
Filing Date: 2013-04-23
Classification: F01D,Y02T

Abstract:
1. A transonic blade comprising: a hub cross-sectional surface joined to a rotating shaft or an outer circumferential side casing of a rotating machine; a tip cross-sectional surface located furthest from the hub cross-sectional surface in a spanwise direction which is a vertical direction of the rotating shaft; a leading edge located on an upstream side in a flow direction of a working fluid main flow; and a trailing edge located on a downstream side in the flow direction of the working fluid main flow; wherein at least a part of a passing working fluid flow has a transonic speed or higher, wherein a portion of a stacking line which is a line connecting together respective gravity centers of cross-sectional surfaces located from the hub cross-sectional surface to the tip cross-sectional surface is located on a downstream side of a stacking center which corresponds to a gravity center position of the hub cross-sectional surface in the flow direction of the working fluid main flow, further comprising a third cross-sectional surface between the hub cross-sectional surface and the tip cross-sectional surface, wherein the stacking line protrudes toward the downstream side of the main flow direction between the third cross-sectional surface and the tip cross-sectional surface, the stacking line protrudes toward the upstream side in the main flow direction between the third cross-sectional surface and the hub cross-sectional surface, a gravity center position of the tip cross-sectional surface is located on the upstream side of the stacking center in the flow direction of the working fluid main flow, and a gravity center of the overall transonic blade is located on the downstream side of the stacking center.