TURBOFAN ENGINE VARIABLE PITCH FAN WITH HIGH BLADE SOLIDITY AND LARGE PITCH RANGE

摘要

A variable pitch fan for a propulsion device is provided. The variable pitch fan includes a plurality of fan blades 40 coupled to a disk 42 and a rotatable front hub 52 covering the disk. Each fan blade 40 is rotatable about a pitch axis (P) to vary a pitch of the fan blade 40. The pitch is variable within a pitch range that is at least about 80° to about 130°. Each fan blade 40 extends radially outward from the disk 42 along a span (S) from a root 102 to a tip (104). A portion of the span (S) adjacent the root 102 defines a root span region (S_R), a portion of the span (S) adjacent the tip 104 defines a tip span region (S_T). A solidity of the variable pitch fan is at least 1.0 in the root span region (S_R).