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Effects of thrust reversing in ground proximityThe changes in stability and control characteristics encountered by a thrust reversing aircraft during its final approach, landing, and ground roll are described. These changes include a strong pitch-up accompanied by the loss of horizontal tail and aileron control effectiveness. The magnitude of reverser induced changes in ground effect are much larger than corresponding changes in free air. Some unexpected unsteady motions exhibited in wind tunnel by an aircraft model with reversers operating in ground proximity are also described. The cause of this oscillatory behavior was determined to be an unsteady interaction between the wall jets formed by impingement of reverser jets on the ground and the on-coming free stream. Time histories of rolling moments measured by the wind tunnel balance or support system were removed and frequencies were scaled by Strouhal number to full scale. Corrected time series were used to simulate the motion of a fighter aircraft with thrust reversers in ground effect. The simulation predicted large roll angles and nose down attitude at touchdown. Some phenomena of jet attachment to solid surfaces are discussed and areas for future research are recommended.
Document ID
19870014983
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Joshi, P. B. (Northrop Corp. Hawthorne, CA, United States)
Hughes, R. V. (Northrop Corp. Hawthorne, CA, United States)
Date Acquired
September 5, 2013
Publication Date
February 1, 1987
Publication Information
Publication: NASA. Ames Research Center Proceedings of the 1985 NASA Ames Research Center's Ground-Effects Workshop
Subject Category
Aerodynamics
Accession Number
87N24416
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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