PRELIMINARY DESIGN STUDY OF CONVERTIBLE FAN/SHAFT ENGINES
GENERAL MOTORS CORP INDIANAPOLIS IN ALLISON GAS TURBINE DIV
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The report presents the results of a study of a large number of conceptual arrangements for a convertible fanshaft engine applicable to advanced rotary-wing aircraft. Fanshaft power transfer methods were examined and defined. Various methods of fan unloading to minimize or eliminate thrust at hover and to reduce the parasitic fan power were explored. Engine sizing to meet the dual requirements of shaft power and fan thrust was accomplished, and a control system for coordinating shaft power and fan thrust was defined. Performance is presented for supercharged and nonsupercharged gas generator arrangements with various forms of variable fan geometry and decoupling.
- Jet and Gas Turbine Engines