Vehicles and Performance

Turbulence

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Imaging

Shaking Outside the Box to Advance Flight Research

A technique called Shake the Box predicts the positions of already-tracked particles and then corrects errors using image matching. The algorithms triangulate the positions of new particles in the measurement domain, enabling scientists to look at higher-particle densities with greater positional accuracy.

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Briefs
Test & Measurement

sUAS-Based Payload Development and Testing for Quantifying Optical Turbulence

Understanding how atmospheric effects can impact operational conditions is important to the development of High Energy Laser (HEL) weapon systems.

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News
Power

Driving the 2020 Corvette Stingray

Grasping the true beauty of Chevy’s new 2020 Corvette supercar demands a deep dig. You must venture beyond the exciting-to-a-fault exterior skin and the lavish stitched-leather, buffed-metal, and...

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Briefs
Aerospace

Green’s Function Extraction from Atmospheric Acoustic Propagation

Understanding what affects acoustic waves propagating in the atmosphere is important for a variety of military applications.

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News
Aerospace

Lockheed Martin Announces Latest Hypersonic Progress at Le Bourget

Lockheed Martin Corporation successfully flight tested the AGM-183A Air-Launched Rapid Response Weapon (ARRW) on a U.S. Air Force Boeing B-52 Stratofortress. The captive...

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Briefs
Photonics/Optics

Stimulated Brillouin Scattering (SBS) Suppression and Long Delivery Fibers at the Multikilowatt Level with Chirped Seed Lasers

One obstacle in the scaling of high-power fiber lasers arises because of nonlinear effects (e.g., stimulated...

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News
Imaging

Lock-In Imaging System for Detecting Disturbances in Fluid

NASA's Langley Research Center has developed an aircraft-based turbulence and vortex detection system. Turbulence and vortices in the front-flight path are very dangerous for airplanes....

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Articles
Aerospace

RECAT Wake Turbulence Recategorization

Aviation safety is a fundamental concern for all stakeholders. The traveling public demands the highest safety standards, but also wants convenience and reliability at a low price with minimal...

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Briefs
Photonics/Optics

Computational Photonics in Laser Communications Through Clouds

This work explored the concept of creating a partially coherent laser beam consisting of an array of spatially overlapping or separated Gaussian beams with possible individual...

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Briefs
Physical Sciences

Characterizing Turbulent Wind Flow Near a Wind Barrier Using Sonic Anemometers

The Holloman High Speed Test Track (HHSTT) facility at Holloman Air Force Base (HAFB), NM, has a test section of 1.8 km that contains an artificial rain field...

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Briefs
Physical Sciences

Mixing and Combustion in Turbulent, High-Speed Flows

A collection of reports presents a detailed description of a research program that focused on fundamental investigations of mixing and combustion in turbulent subsonic and supersonic flows like those encountered in high-speed air-breathing aircraft engines. The research included close...

Briefs
Physical Sciences

Liquid-Crystal-Particle Thermometry and Velocimetry System

A three-dimensional (3D) defocusing liquid-crystal-particle thermometry and velocimetry (3DDLCPTV) system has been designed and constructed (but not yet operated) for use in measuring...

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Briefs
Physical Sciences

System for Imaging Turbulent Combustion Flows

Asystem of scientific instrumentation and data-processing equipment has been assembled for research and education in turbulence, mixing, and chemical reactions (especially combustion) in...

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Briefs
Mechanical & Fluid Systems

Some Advances in Reducing Drag and Suppressing Convection

Theoretical and computational research has yielded some advances in the art of designing active feedforward and feedback controllers to suppress thermal convection and reduce drag (by...

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Briefs
Information Technology

Application of CFD to a Slender-Bodied, Finned Projectile

In an application of computational fluid dynamics (CFD), flow fields about a slender-bodied finned projectile and the resulting aerodynamic forces and moments on the projectile were...

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Briefs
Mechanical & Fluid Systems

Active Flow Control Demonstrated on “Airborne Wind Tunnel”

AFRL engineers, collaborating with aerospace manufacturers and other Air Force groups, recently demonstrated the first-ever airborne active flow control system when they manipulated...

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