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High Stability Engine Control (HISTEC)Future aircraft turbine engines, both commercial and military, must be able to successfully accommodate expected increased levels of steady-state and dynamic engine-face distortion. The current approach of incorporating a sufficient component design stall margin to tolerate these increased levels of distortion would significantly reduce performance. The objective of the High Stability Engine Control (HISTEC) program is to design, develop, and flight demonstrate an advanced, high-stability, integrated engine control system that uses measurement-based, real-time estimates of distortion to enhance engine stability. The resulting distortion tolerant control reduces the required design stall margin, with a corresponding increase in performance and decrease in fuel burn. The HISTEC concept, consisting of a Distortion Estimation System and a Stability Management Control, has been designed and developed. The Distortion Estimation System uses a small number of high-response pressure sensors at the engine face to calculate indicators of the type and extent of distortion in real time. The Stability Management Control, through direct control of the fan and compressor pressure ratio, accommodates the distortion by transiently increasing the amount of stall margin available based on information from the Distortion Estimation System. Simulation studies have shown the HISTEC distortion tolerant control is able to successfully estimate and accommodate time-varying distortion. Currently, hardware and software systems necessary for flight demonstration of the HISTEC concept are being designed and developed. The HISTEC concept will be flight tested in early 1997.
Document ID
19960033186
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
DeLaat, John C. (NASA Lewis Research Center Cleveland, OH United States)
Southwick, Robert D. (United Technologies Corp. West Palm Beach, FL United States)
Gallops, George W. (United Technologies Corp. West Palm Beach, FL United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1996
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NAS 1.15:107272
E-10339
AIAA Paper 96-2586
NASA-TM-107272
Meeting Information
Meeting: Joint Propulsion Conference
Location: Lake Buena Vista, FL
Country: United States
Start Date: July 1, 1996
End Date: July 3, 1996
Sponsors: American Society for Electrical Engineers, American Society of Mechanical Engineers, American Inst. of Aeronautics and Astronautics, Society of Automotive Engineers, Inc.
Accession Number
96N30006
Funding Number(s)
PROJECT: RTOP 505-62-50
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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