Unsteady Aerodynamic Study on Last-stage Long Blades of a Steam Turbine Low-pressure Cylinder

Taking the last two-stage blades of a steam turbine low-pressure cylinder as the objects of study, the aerodynamic flow around the blades was analyzed using non-linear harmonic method, after which the distribution of unsteady aerodynamic loads on the blade surfaces was acquired. Results show that the method proposed can well capture the phenomenon of unsteady flow, such as strong unsteady flow in the diffuser of last-stage stator blade, no obvious unsteady flow in the area of blade tip, etc. The calculation results may serve as a reference for dynamic response analysis of last-stage long blades.