Abstract
This report suggests a simple formula for calculating the mean outlet flow angle deviation caused by the secondary flow in turbine cascades of semi-infinite span, assuming the secondary vortices concentrated at their centroid, then deriving secondary velocities along the trailing edges and computing the actual vane circulation using Smith's equation(1). As the results, following conclusions are obtained. (1) Deviation of outlet flow angle increases much more with inlet flow angle than with outlet flow angle. (2) Deviation of outlet flow angle increases with the spacing of cascade, especially of impulse cascade of large camber angle. (3) Calculated results were compared with some experiments and fairly good coincidence was obtained except the effect of passage vortex of impulse cascade flowing towards the midspan.
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