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Investigating Turbofan Engine Internal Aerodynamics
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English
Abstract
The intent of a balanced engine design process is to satisfy all systems requirements including operability, performance and durability. Due to the complexity of the trade-off process of the various metrics it is possible that system improvements may be required after a turbofan engine enters production. Also, in the case of derivative engines, configured for increased performance, the flowpath aerodynamics may be challenged and may have to be examined to ensure there is no flow field anomaly. By incorporating special diagnostic aero instrumentation at the earliest opportunity any required operability improvement can be identified and corrective action taken. The paper first delineates the component matching challenges of twin spool mixed flow turbofan engines. Then it discusses investigation of various potential destabilizing influences. Examples are presented on quantifying transient fan stall margin, investigating internal flow quality, verifying absence of secondary flow reversals, and on the analysis of compressor interstage measurements for the identification of weak stages. The process described contributes to continuous product improvement.
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Authors
Citation
Khalid, S., "Investigating Turbofan Engine Internal Aerodynamics," SAE Technical Paper 965630, 1996, https://doi.org/10.4271/965630.Also In
References
- Koff, B. L. “Designing for Durability in Fighter Engines” International Journal of Turbo and Jet Engines 1 3 1984 209 222
- Khalid, S. J. “Role of Dynamic Simulation in Fighter Engine Design and Development” AIAA Journal for Propulsion and Power 8 1 January-February 1992 219 226
- Khalid, S. J. Faherty, M. F. “Propulsion System Flight Test Analysis Using Modeling Techniques” International Journal of Turbo and Jet Engines 10 3 31 44
- Khalid, S. J. Legore, R. T. “Enhancing Fighter Engine Airstarting Capability” SAE paper #91190 April 1991
- Brimelow, B. “Techniques for Establishing Propulsion System Stability” Air Force Aero Propulsion Laboratory Technical Memorandum APTA TM-69-12 April 1969