Rotating Stall in Blade Rows Operating in Shear Flow : 2nd Report: The Case of Shear Flow with Piecewise Linear Velocity Profile

概要

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A theory for unsteady small perturbations in a shear flow with an arbitrary, but piecewise linear, velocity profile has been developed. Based on this, rotating stall in three dimensional blade rows, subjected to a spanwise sheared inlet flow, is examined. With the total pressure loss characteristics known from experiment, calculations show the effect of flow shear and the spanwise total pressure loss distribution upon various aspects of rotating stall, e.g., the onset condition, the propagation velocity and the distribution of disturbances. The effect of the blade aspect ratio is also discussed.
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