LOW HUB-TO-TIP RATIO FAN FOR A TURBOFAN GAS TURBINE ENGINE

摘要

A fan for a turbofan gas turbine engine, the fan comprising a rotor hub and a plurality of radially extending fan blades integral with the hub to form an integrally bladed rotor. Each fan blade defines a leading edge. A hub radius (R HUB) is the radius of the leading edge at the hub relative to a centerline of the fan. A tip radius (R TIP) is the radius of the leading edge at a tip of the fan blade relative to the centerline of the fan. The ratio of the hub radius to the tip radius (R HUB/R TIP) is at least less than 0.29. In a particular embodiment, this ratio is between 0.25 and 0.29. In another particular embodiment, this ratio is less than or equal to 0.25.