Abstract
This paper deals with an application of Computational Fluid Dynamics, CFD, to partial arc admission stages in an axial flow turbine. Unsteady 3-dimensional CFD analysis of a partial arc admission stage in an air turbine is conducted to investigate unsteady forces applied to rotor blades due to partial arc admission. Through the CFD analysis, fluctuations of aerodynamic forces are revealed. In order to verify the accuracy of the CFD analysis, an experiment of the air turbine is carried out under the same conditions as the CFD analysis. The comparison of turbine efficiency between the CFD analysis and the experiment is also discussed and they show good agreement.
