As yet, there is no known reliable method for directly measuring the thrust of a turbofan in flight. Manufacturers of civil turbofans use various indirect thrust measurements to indicate performance of an engine to the flight deck. Included among these are: Engine Pressure Ratio (EPR), Integrated Engine Pressure Ratio (IEPR), Fan mechanical speed (N1), and various Turbine Gas Temperatures such as ITT or EGT. Of key concern is whether these thrust indicators give an accurate account of the actual engine thrust. The accuracy of these methods, which is crucial at take-off, may be compromised by various types of common engine deterioration, to the point where a thrust indicator may give a false indication of the health and thrust of the engine. A study was done to determine the effect of advanced engine cycles on typical values of these parameters. A preliminary investigation of the effects of common kinds of turbofan deterioration was conducted to see how these faults can affect both actual engine performance and the indirect thrust indicators.
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January 1995
Research Papers
Simulating Indirect Thrust Measurement Methods for High-Bypass Turbofans
J. D. Stevenson,
J. D. Stevenson
Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, Ontario, Canada
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H. I. H. Saravanamuttoo
H. I. H. Saravanamuttoo
Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, Ontario, Canada
Search for other works by this author on:
J. D. Stevenson
Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, Ontario, Canada
H. I. H. Saravanamuttoo
Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, Ontario, Canada
J. Eng. Gas Turbines Power. Jan 1995, 117(1): 38-46 (9 pages)
Published Online: January 1, 1995
Article history
Received:
March 17, 1993
Online:
November 19, 2007
Citation
Stevenson, J. D., and Saravanamuttoo, H. I. H. (January 1, 1995). "Simulating Indirect Thrust Measurement Methods for High-Bypass Turbofans." ASME. J. Eng. Gas Turbines Power. January 1995; 117(1): 38–46. https://doi.org/10.1115/1.2812779
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