This paper will discuss a study of an innovative design for an advanced turbine rotor that could have a great impact on future engines. The design challenge is to provide a minimum weight turbine rotor system that can withstand beyond state-of-the-art levels of AN2 (turbine annulus area multiplied by speed squared). An AN2 limit has been reached for high-pressure turbine (HPT) disks configured in conventional (single web) geometry with state-of-the-art nickel alloys. The problem has reached the point where increased AN2 has been declared a “break-through” technology. The twin-web disk has the potential to provide this break through. This paper will present the history of this turbine rotor design, analytical results, material/component processing, and concept validation results. All work was performed under an Air Force sponsored program entitled “Composite Ring Reinforced Turbine” (CRRT).

Cairo, R. R., 1999, “Composite Ring Reinforced Turbine,” Program Final Report, Contract F33615-92-C-2201, Report No. AFRL-PR-WP-TR-1999-2050.
Cairo, R. R., 1992, “Advanced Turbine Rotor Design,” Program Final Report, Contract F33615-85-C-2594, Report No. AFWAL-TR-88-2129.
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