Abstract
In a passage of turbomachinery, the complex secondary flow is produced by the effects of the centrifugal forces induced by the passage curvature as well as its rotation and the Coriolis force. The passage vortex (PV) in the secondary flow generates a major part of the losses. Curved ducts are considered to be fundamental models to clarify the behavior of PV in the present study. The mechanisms of the loss generation caused by PV are analyzed in detail by using the stationary curved square ducts. The analyses are performed with the numerical technique in order to examine the effect of the curvature of the curved duct on the loss generation by PV. The computed results revealed the relationships among the curvature, the loss generation, the strength of PV and the pressure distribution.
