Abstract
Flow behavior of a rotating stall is studied numerically by means of the vortex model which was developed to solve the flows through stalled cascades. The flow features and pressure distributions, as well as the aerodynamic forces and moments exerted on the blades are examined. It is clarified that the strong suction due to the stall and unstall vortices has a considerable influence on the unsteady aerodynamic characteristics of the blades. The development of rotating stall of large amplitudes from various initial disturbances is also shown. Some important aspects of the rotating stall such as inception point, the hysteresis, the number of stall cells and its timewise changes are discussed and compared with the results deduced from a conventional linearized actuator disk theory.
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