NDLI: Calculation of the longitudinal aerodynamic characteristics of stol aircraft with externally-blown jet-augmented flaps

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Calculation of the longitudinal aerodynamic characteristics of stol aircraft with externally-blown jet-augmented flaps

Content Provider	NASA Technical Reports Server (NTRS)
Author	Mendenhall, M. R. Dillenius, M. F. E. Spangler, S. B.
Copyright Year	1974
Description	A theoretical investigation was made to develop methods for predicting the longitudinal aerodynamic characteristics of externally-blown, jet-augmented wing-flap combinations. A potential flow analysis was used to develop two models: a wing-flap lifting surface model and a high-bypass-ratio turbofan engine wake model. Use of these two models in sequence provides for calculation of the wing-flap load distribution including the influence of the engine wake. The method can accommodate multiple engines per wing panel and part-span flaps but is limited to the case where the flow and geometry of the configuration are symmetric about a vertical plane containing the wing root chord. Comparisons of predicted and measured lift and pitching moment on unswept and swept wings with one and two engines per panel and with various flap deflection angles indicate satisfactory prediction of lift and moment for flap deflections up to 30 to 40 degrees. At higher flap angles with and without power, the method begins to overpredict lift, due probably to the appearance of flow separation on the flaps.
File Size	8154588
Page Count	200
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19740008606
Archival Resource Key	ark:/13960/t8hf2m91v
Language	English
Publisher Date	1974-02-01
Access Restriction	Open
Subject Keyword	Aircraft Externally Blown Flaps Lift Devices Flow Distribution Aircraft Wakes Short Takeoff Aircraft Jet Flaps Flow Geometry Aerodynamic Characteristics Load Distribution Forces Longitudinal Stability Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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