Results 81 to 90 of about 104,934 (214)
Computational Study of a Generic T-tail Transport [PDF]
This paper presents a computational study on the static and dynamic stability characteristics of a generic transport T-tail configuration under a NASA research program to improve stall models for civil transports.
Cunningham, Kevin +5 more
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Analysis of an unswept propfan blade with a semiempirical dynamic stall model [PDF]
The time history response of a propfan wind tunnel model with dynamic stall is studied analytically. The response obtained from the analysis is compared with available experimental data.
Kaza, K. R. V., Reddy, T. S. R.
core +1 more source
Simulating the aerodynamic performance and wake dynamics of a vertical-axis wind turbine [PDF]
, 2011 The accurate prediction of the aerodynamics and performance of vertical-axis wind turbines is essential if their design is to be improved but poses a signifi cant challenge to numerical simulation tools.
Brown, Richard +2 more
core +1 more source
Unsteady stall control using dynamically deforming airfoils
AIAA Journal, 1998 Introduction An experiment documenting the compressible flow over a dynamically deforming airfoil is presented. This airfoil, which has a leading edge radius that can be dynamically changed, was tested at various defor- mation rates for fixed airfoils angle of attack. Selected leading-edge shapes were also tested during airfoil os- cillation.
Chandrasekhara, M.S. +2 more
openaire +2 more sources
Aerodynamic characteristics of airplanes at high angles of attack [PDF]
An introduction to, and a broad overiew of, the aerodynamic characteristics of airplanes at high angles of attack are provided. Items include: (1) some important fundamental phenomena which determine the aerodynamic characteristics of airplanes at high ...
Chambers, J. R., Grafton, S. B.
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Low-speed wind-tunnel investigation of the flight dynamic characteristics of an advanced turboprop business/commuter aircraft configuration [PDF]
An investigation was conducted to determine the low-speed flight dynamic behavior of a representative advanced turboprop business/commuter aircraft concept. Free-flight tests were conducted in the NASA Langley Research Center's 30- by 60-Foot Tunnel.
Coe, Paul L., Jr. +2 more
core +1 more source
Aerodynamic Response of a Hovering Rotor to Ramp Changes in Pitch Input [PDF]
, 2008 Under transient conditions, a helicopter rotor generates a complex, time-dependent pattern of shed and trailed vorticity in its wake that has profound eects on its loading.
Brown, R.E., Duraisamy, K.
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Application of the ONERA model of dynamic stall [PDF]
A semiempirical model to predict the unsteady loads on an airfoil that is experiencing dynamic stall, is investigated. The mathematical model is described from an engineering point of view, demonstrates the procedure for obtaining various empirical ...
Lambert, O., Mcalister, K. W., Petot, D.
core +1 more source
An automated stall-speed warning system [PDF]
The development and testing of a stall-speed warning system for the OV-1C was examined. NASA designed and built an automated stall-speed warning system which presents both airspeed and stall speed to the pilot.
Bever, G. A., Wilner, D. O.
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Water tunnel studies of dynamic wing flap effects [PDF]
, 2016 The flow features developing over a two-element NACA 0012 airfoil, with the rear portion serving as a trailing edge flap, were investigated using dye flow visualization in the NPS water tunnel.
Gonz‡lez, Edgar E.
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