The slotted blade applies boundary-layer control to the blades of axial-flow blowers. This offers a means to design axial-flow blowers for higher efficiencies, or higher pressure coefficient, or possibly a combination of both. Test data of an experimental blower are presented, indicating blower efficiencies to 94 per cent and stage efficiencies to 96 per cent with high-pressure coefficients corresponding to a maximum flow deflection of about 52 deg.

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