Single-curvature fan wheel of diagonal-flow fan

摘要

A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a cylinder, which has a single-curvature or developable surface. To realize the formation of a blade from the single-curvature surface, lines of intersection between a cylinder and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.