Keyword: Turbulence

Briefs: Sensors/Data Acquisition
Understanding how atmospheric effects can impact operational conditions is important to the development of High Energy Laser (HEL) weapon systems.
Briefs: Test & Measurement
Understanding what affects acoustic waves propagating in the atmosphere is important for a variety of military applications.
Briefs: Photonics/Optics

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

News: Imaging

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...

Articles: Aerospace

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...

Briefs: Photonics/Optics

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...

Briefs: Physical Sciences

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...

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

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

Briefs: Physical Sciences

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...

Briefs: Mechanical & Fluid Systems

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...

Briefs: Information Technology

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...

Briefs: Mechanical & Fluid Systems

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