초록 ▼

The action of upstream and downstream foil sets rotating on a common shaft within a fluid is enhanced by fixing certain interrelations of the foils such as the axial distance between the foils, the radial index between foils and pitch of one foil relative to the other so that the foil stages are fix

The action of upstream and downstream foil sets rotating on a common shaft within a fluid is enhanced by fixing certain interrelations of the foils such as the axial distance between the foils, the radial index between foils and pitch of one foil relative to the other so that the foil stages are fixedly mounted with the foils of each stage being symmetrically and equidistantly spaced from one another and from the foils of the next adjacent foil stage so that the interacting uniform adjacent foil pressures and the upstream foil wake beneficially interacts optimally with at least one of the surfaces or boundary layers of the foils of the next adjacent downstream foil stage.

대표청구항 ▼

An axial flow foil system acting upon a medium such as air comprising in combination two co-rotating foil stages or discs, an upstream foil stage or disc and a downstream foil stage or disc, each foil stage having an equal number of foils, a common shaft, said shaft axially spacing said foil stages

An axial flow foil system acting upon a medium such as air comprising in combination two co-rotating foil stages or discs, an upstream foil stage or disc and a downstream foil stage or disc, each foil stage having an equal number of foils, a common shaft, said shaft axially spacing said foil stages to provide clear and substantial disc separation as a function of the downstream location of the wake generated by the upstream foil at the juncture of the substantially intercepted downstream foil, the foils of each stage including roots, said foil stages being fixedly mounted upon said shaft by said roots for common rotation therewith and with one another and in frontal symmetry, the foils or blades of each individual stage having the same pitch and being substantially symmetrically and substantially equidistantly spaced from one another and from the foils of the adjacent foil stage in substantially uniform wake producing relationship so that the interacting, substantially uniform adjacent foil pressures and the upstream foil wakes beneficially interact optimumly with the foils, not necessarily the nearest adjacent ones, of the downstream foil stage, in which virtually continuous air foils are formed of leading edge upstream foils and their cooperating trailing edge downstream foil partners with the separation between these foils provided by the common shaft, that is the substantially common planform index advance angle (I.A.) in the system together with the clear and substantial disc separation (B°) establishes the critical substantially frontal symmetry and the fixed blade root locations upon said shaft.