Not Available

Not Available This Phase I SBIR proposal is focused on shrouds for wide chord, low aspect ratio stage 1 fan blades. A tip shroud ring and a part span shroud bling. Both shroud types use BMI/Graphite composites and both types are attached to the blade tips by an interference shrink-fit which pins the blade tip in the radial, axial, and tangential directions. Type 1 BMI/Graphite tip shroud rings were successfully demonstrated to 1818 ft/sec tip speed on wide chord, low aspect ratio, transonic Wright Labs Parametric Blade Study Rotor 2 PBSR2. The tip shrouded PBSR2 was also bench tested and produced significant increases in the fundamental blade frequencies; Campbell Diagram 1F 2rev margins, and blade damping. An innovative design coceppt si presented in this SBIR Phase I proposal that eliminates tip leakage re-circulationwhile retainingthe jamor aeromechanic benefits associated with the tip shroud ring previously tested. the new concept is a Type 2 part span, shrink fit BMI/Graphite shroud bling is proposed. Alternate, 3D, reinforced BMI/Graphite configurations will be studied as well as a range of bling span geights. FEM and FEA willbe made of each configuration. A supplementary aerodynamic study of bling configurations by Wright Laboratories and/or NASA Lewis is suggested. Such aerodynamic studies would be separately funded.