An experimental investigation has been made of the effects of transverse injection from the hub in front of the blades of an annular cascade. The hub end-wall boundary layer could be skewed, by rotating the nose cone. The data on transverse injection effects in straight cascades was extended to provide comparisons with the annular cascade results. Similar effects were observed in the two types of cascades, the principal effects being the creation of a separation bubble on the hub end-wall behind the injection slot, and the strengthening of the passage vortex, which is lifted away from the hub end-wall.

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