Low speed wind tunnel investigation of a four-engine upper surface blown model having swept wing and rectangular and D-shaped exhaust nozzles [PDF]
A low speed investigation was conducted in the Langley V/STOL tunnel to determine the power-on static-turning and powered-lift aerodynamic performance of a four engine upper surface blown transport configuration.
Hohlweg, W. C., Sleeman, W. C., Jr.
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Noise reduction tests of large-scale-model externally blown flap using trailing-edge blowing and partial flap slot covering [PDF]
Noise data were obtained with a large-scale cold-flow model of a two-flap, under-the-wing, externally blown flap proposed for use on future STOL aircraft.
Burns, R. J. +2 more
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Optimal design of wind turbine blades equipped with flaps [PDF]
, 2014 As a result of the significant growth of wind turbines in size, blade load control has become the main challenge for large wind turbines. Many advanced techniques have been investigated aiming at developing control devices to ease blade loading.
Maheri, Alireza, Wiratama, I. Kade
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USB flow characteristics related to noise generation [PDF]
The effects of nozzle and flap geometry on upper surface blown flow field characteristics related to noise generation were examined experimentally using static models.
Brown, W. H., Reddy, N. N.
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OTW noise correlation for variations in nozzle/wing geometry with 5:1 slot nozzles [PDF]
Acoustic data obtained from a model-scale study with 5:1 slot nozzles are analyzed and correlated in terms of apparent noise sources. Variations in nozzle geometry include roof angle and sidewall cutback. In addition, geometry variations in wing size and
Groesbeck, D., Vonglahn, U.
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Noise Radiation from a Continuous Mold-Line Link Flap Configuration [PDF]
The results of an experimental study of the noise from a Continuous Mold-Line Link (CML) flap are presented. Acoustic and unsteady surface pressure measurements were performed on a main element wing section with a half-span CML flap in NASA Langley s ...
Brooks, Thomas F. +2 more
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Some measurements of an EBF powered-lift wake [PDF]
Results from a wind tunnel investigation in which velocity vector measurements were obtained in the near wake of an externally blown flap powered lift configuration were analyzed.
Johnson, W. G., Jr.
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Presentation of the acoustic and aerodynamic results of the Aladin 2 concept qualification testing [PDF]
Wind tunnel tests were conducted of a scale model of the Aladin 2 aircraft. The propulsion system configuration is described and the air flow caused by jet ejection is analyzed.
Collard, M., Doyotte, C., Sagner, M.
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Geometry effects on STOL engine-over-the-wing acoustics with 5.1 slot nozzles [PDF]
The correspondence of far field acoustic trends with changes in the characteristics of the flow field at the wing trailing edge caused by alterations in the nozzle-wing geometry were determined for several STOL-OTW configurations.
Groesbeck, D., Vonglahn, U.
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Development of smart blade technology - trailing edge flaps [PDF]
, 2014 With blade lengths presently up to 80+ m there is a need for a supplement to the standard pitch system for control of power and loads. Distributed load control along the blade span with trailing edge flaps is a promising concept where numerical simulations have shown considerable load alleviation potential.
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