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Variable Pitch Fan - The Solution to Achieving High Propulsive Efficiency Turbofan Engines
Technical Paper
2009-01-3103
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Engine manufacturers recognize that either a variable pitch fan blade or a variable area fan nozzle can provide the necessary fan stall/flutter margin to take the next step in engine cycle improvement with enhanced propulsive efficiency and low noise level. The patented Rotating Composite Technologies, LLC variable pitch fan design uniquely offers the same or lower fan hub/tip radius ratio of conventional fixed pitch designs and, with its light weight composite fan blades integrated with an even smaller disk, offers weight savings as well. A variable fan nozzle conversely adds additional weight to the propulsion system and notably will complicate aircraft installation issues relative to competitive manufacturer's engines.
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Authors
Citation
Mazzawy, R. and Virkler, J., "Variable Pitch Fan - The Solution to Achieving High Propulsive Efficiency Turbofan Engines," SAE Technical Paper 2009-01-3103, 2009, https://doi.org/10.4271/2009-01-3103.Also In
References
- The Aerothermodynamics of Aircraft Gas Turbine Engines Oates G. C. AFAPL-TR-78-52, Chapter 7: Non-Ideal Cycle Analysis Oates G. C. July 1978
- Mazzawy R. S. Performance Study for Benefits of Variable Pitch Composite Fan CCAT Report October 2008