Results 91 to 100 of about 346,306 (411)

Analytical Models for Rotor Test Module, Strut, and Balance Frame Dynamics in the 40 by 80 Ft Wind Tunnel [PDF]

A mathematical model is developed for the dynamics of a wind tunnel support system consisting of a balance frame, struts, and an aircraft or test module. Data are given for several rotor test modules in the Ames 40 by 80 ft wind tunnel.
Johnson, W.
core   +1 more source

Aeroelastic instability stoppers for wind tunnel models [PDF]

, 1981
A mechanism for diverting the flow in a wind tunnel from the wing of a tested model is described. The wing is mounted on the wall of a tunnel. A diverter plate is pivotally mounted on the tunnel wall ahead of the model. An actuator fixed to the tunnel is
Doggett, R. V., Jr., Ricketts, R. H.
core   +2 more sources

Comparison of Lifetime-Based Pressure-Sensitive Paint Measurements in a Wind Tunnel Using Model Pitch–Traverse and Pitch–Pause Modes

Photonics
In order to improve the data productivity of a wind tunnel test, the model under investigation in the wind tunnel is moved continuously with a predetermined constant angular speed in the so-called pitch–traverse mode. Alternatively, the wind tunnel model
Christian Klein, Daisuke Yorita, Ulrich Henne   +2 more
doaj   +1 more source

RTRI's Large-scale Low-noise Wind Tunnel and Wind Tunnel Tests

Quarterly Report of RTRI, 2001
This article describes the specifications of the Large-scale Low-noise Wind Tunnel completed at Maibara, Japan in 1996. It is used to study aerodynamic noise and other aerodynamic phenomena related to the operation of high-speed trains and to test systems to reduce deleterious effects. Two features stand out: extremely low background noise and a device
Tatsuo MAEDA, Yoshihiko KONDO
openaire   +2 more sources

Orbiter Entry Heating Lessons Learned from Development Flight Test Program [PDF]

The Space Shuttle orbiter's thermal protection system (TPS), designed mainly on the basis of wind tunnel test data, has successfully completed its design, development, and flight test program.
Haney, J. W., Jr.
core   +1 more source

Self‐Trapped Hole Migration and Defect‐Mediated Thermal Quenching of Luminescence in α‐ and β‐Ga2O3

Advanced Functional Materials, EarlyView.
Temperature‐dependent photoluminescence and first‐principles calculations reveal self‐trapped hole migration as the microscopic origin of thermal quenching in α‐ and β‐Ga2O3. The low migration barrier in α‐Ga2O3 enables defect trapping and enhances blue luminescence, while the higher barrier in β‐Ga2O3 preserves ultraviolet emission at elevated ...
Nima Hajizadeh, Ymir K. Frodason, Clemens Petersen, Benjamin M. Janzen, Luca Sung‐Min Choi, Nils Bernhardt, Felix Nippert, Zbigniew Galazka, Joel B. Varley, Holger von Wenckstern, Lasse Vines, Markus R. Wagner   +11 more
wiley   +1 more source

Correaltion of full-scale drag predictions with flight measurements on the C-141A aircraft. Phase 2: Wind tunnel test, analysis, and prediction techniques. Volume 1: Drag predictions, wind tunnel data analysis and correlation [PDF]

The degree of cruise drag correlation on the C-141A aircraft is determined between predictions based on wind tunnel test data, and flight test results. An analysis of wind tunnel tests on a 0.0275 scale model at Reynolds number up to 3.05 x 1 million/MAC
Blackerby, W. T., Macwilkinson, D. G., Paterson, J. H.   +2 more
core   +1 more source

The Dynamics of Interfacial Trap States in High‐Detectivity Near‐Infrared Photomultiplication Organic Photodetectors

Advanced Functional Materials, EarlyView.
Photomultiplication organic photodetectors (PM OPDs) are an attractive strategy for health‐monitoring. Here, PM‐OPDs are reported with a specific detectivity of 5.7 × 1012 Jones and external quantum efficiency values of 3500% under −10 V. The dynamics of carrier trapping in these devices are elucidated through trap selective spectroscopical techniques.
Marie Houot, Zhuoran Qiao, Beier Hu, Davide Nodari, Francesco Furlan, Filip Aniés, Yicheng Yang, Martin Heeney, Artem A. Bakulin, Nicola Gasparini   +9 more
wiley   +1 more source

An automated system for navigating object mounts within a wind tunnel facility [PDF]

EPJ Web of Conferences
From an engineering point of view, understanding how the flow behaves downstream from solid objects is essential. The current configuration of the Armfield subsonic wind tunnel (computer controlled C15 − 10 model) does not provide uniform guidance for ...
Sundar Adithya, Faazil Aafrein Begam, Achary Sundar Rajan Arjunan, Siddharth Kizhakkelan Sudhakaran   +3 more
doaj   +1 more source

A simplified method for calculating temperature time histories in cryogenic wind tunnels [PDF]

Average temperature time history calculations of the test media and tunnel walls for cryogenic wind tunnels have been developed. Results are in general agreement with limited preliminary experimental measurements obtained in a 13.5-inch pilot cryogenic ...
Lamb, M., Stallings, R. L., Jr.
core   +1 more source