Keyword: Wind tunnel tests

Briefs: Sensors/Data Acquisition
Microspheres are used in wind tunnel experiments to monitor airflow, to stain biological samples, and in time-delayed drug release.
Briefs: Robotics, Automation & Control
This model can be used to design better aircraft without having to wait months for supercomputer calculations.
Briefs: Data Acquisition

Aircraft currently fly based on coarse estimations of environment and aircraft state. Real-time measurements are traditionally restricted to laboratory environments (e.g. wind tunnel) due to the size and...

Briefs: Software

NASA’s Langley Research Center has developed a landing gear cavity modification that reduces noise produced during aircraft approach and landing. The modification is an innovative stretchable...

Briefs: Software
Discontinuous-Galerkin Spectral-Element Solver (Eddy)

Eddy is a fundamental research code for advancing spectral methods for complex geometry. The software is intended to enable researchers to collaborate through a common framework that supports three-dimensional simulations on practical problems. Areas of interest include advanced numerical...

Briefs: Aerospace

NASA’s Langley Research Center has developed aircraft flap tip modifications that reduce noise produced during approach and landing. The modifications are rigid open lattice (honeycomblike) and fin structures...

Briefs: Software
An Upwind Parabolized Navier-Stokes Solver (UPS) for Supersonic and Hypersonic Flow Simulation, Version 6.1

The simulation of high-speed flow involves unique challenges such as the treatment of strong flow gradients associated with shock waves and expansion fans, as well as the modeling, at hypersonic speeds, of air chemistry effects. However,...

Briefs: Aerospace

Researchers at NASA's Armstrong Flight Research Center (AFRC) recently completed a study of the feasibility of aerial towing an unpiloted, sub-scale vehicle to supersonic flight conditions to examine...

Briefs: Aerospace

The in-situ load system (ILS) provides the ground-testing community with a comprehensive tool that...

Briefs: Materials

NASA’s Glenn Research Center (GRC) has developed a method for fabricating low-density, flexible aerogel composites for use as thermal insulation for myriad...

Briefs: Aerospace

NASA’s Langley Research Center researchers have developed a novel noise reduction system for jet engines. Aircraft jet engine noise is a major issue for airports, the...

Briefs: Aerospace
Improvements to the Functional Beamforming Formula

The purpose of this work is to improve the signal-to-noise ratio of acoustic measurements made in a wind tunnel with a microphone phased array. The functional beamforming method is improved to compensate for effects of acoustic propagation through turbulence, and to correct for inaccurate...

Articles: Aerospace
Simulating the SLS Sound Suppression Water System

NASA’s next-generation Space Launch System (SLS) for deep space exploration consists of four RS-25 liquid rocket engines and...

Briefs: Test & Measurement

NASA’s Langley Research Center has developed a novel method to calculate the relative position and orientation between two rigid objects using a simplified...

Briefs: Mechanical & Fluid Systems

NASA’s Langley Research Center has developed a compact tuned damper to reduce vibration occurring at a fixed frequency. Tuned dampers reduce vibration of the base structure by the dissipation of energy. The...

Application Briefs: Sensors/Data Acquisition

A NASA-developed fiber optic sensor provides the kind of detailed feedback that could guide the direction of flexible wings and other next-generation aerospace parts. The multi-core fiber (MCF)...

Briefs: Test & Measurement
High-Channel-Count, High-Scan-Rate Data Acquisition System for the NASA Langley Transonic Dynamics Tunnel

The NASA Langley Research Center (LaRC) Transonic Dynamics Tunnel (TDT) has been operational since 1960, investigating a wide range of aeroelastic and non-aeroelastic phenomena. A dedicated aeroelastic test facility, the TDT is a large,...

Briefs: Information Technology
BALFIT Version 3.1 Multivariate Regression Analysis and Regression Model Optimization Software

The software package BALFIT was developed for both the processing of wind tunnel strain-gage balance data and the analysis of more general multivariate experimental data sets. The software uses automatically generated regression models for the...

Briefs: Mechanical & Fluid Systems
Rocket Sled Parachute Design Verification

Historically, parachutes have been load-tested by various methods including release from an aircraft, deploying in a wind tunnel, dragging through water, and shooting out of an air cannon. Each type of testing has its own advantages and drawbacks. Due to the loading mechanics particular to parachutes...

Application Briefs: Aerospace
Tecplot 360 EX data visualization and analysis software
Tecplot, Inc.
Bellevue, WA
800-763-7005
www.tecplot.com

NASA chose Tecplot 360 EX for use in the...

Briefs: Aerospace
Open Vehicle Sketch Pad

The conceptual aircraft designer is faced with a dilemma on how to strike the best balance between productivity and fidelity. Attempts have been made to use computer-aided design packages to fill this void, but their cost and steep learning curve have made them unwieldy at best. Open Vehicle Sketch Pad (OpenVSP.org) has...

Briefs: Electronics & Computers
Semiconductor Nanomembrane-Based Flight Sensors and Arrays

There are two broad classes of methods for measuring skin friction (or wall shear): indirect and direct. The direct methods generally employ a movable element of the actual surface surrounded by a very small gap and connected to some type of flexure. One then measures the displacement of...

NASA Spinoff: Aerospace

Langley Research Center aeronautics engineer Richard T. Whitcomb was 34 when he did something no other single person could do. Whitcomb overcame the aviation challenge of the day — the...

Briefs: Photonics/Optics
Megahertz-Rate Molecular Tagging Velocimetry

In recent years, a large number of Lagrangian-based optical velocimetry techniques have been developed that are known, collectively, as either flow tagging velocimetry or molecular tagging velocimetry. In either case, the method is based on the use of an optical resonance to “tag” a pattern into a...

Briefs: Sensors/Data Acquisition
Micro-LIDAR for Flow Velocimetry

A miniature light detection and ranging (LIDAR) velocimetry sensor has been developed to analyze high-velocity and boundary layer flows in real-world conditions. Using Rayleigh scattering, as opposed to the more common particle scattering, the patent-pending sensors provide multiple flow parameters without the...

Briefs: Aerospace
Aircraft Wing Flap Noise-Reducing Fins

Two different modifications have been developed for the edges of aircraft wing flaps to reduce noise. Reactive Orthotropic Lattice Diffuser (ROLD) is a modification that consists of a honeycomb-like, interconnected structure added to the region of the flap that experiences the highest degree of...

Briefs: Manufacturing & Prototyping
Process to Fabricate Specific Sized Monodisperse Polystyrene Microparticles

A new method was developed to prepare monodisperse nano to microparticles of polystyrene ranging from 0.5 to 2.5 microns in relatively large-quantity batches (2 L, 10% by weight in water). Current commercial sources are very expensive and can typically only be acquired...

Briefs: Test & Measurement
Dual-Cavity Rayleigh Scattering Measurement System

Molecular-based optical diagnostics techniques capable of obtaining simultaneous measurements of multiple fluid properties are critically important for characterizing hypersonic air-breathing engines, such as scramjet engines and scramjet-rocket combined cycle engines. Correlations between those...

Briefs: Information Technology
A Large-Eddy Simulation Model of the Atmospheric Boundary Layer

The atmospheric boundary layer is the lowermost layer of the atmosphere and is host to a plethora of physical processes that significantly affect weather, climate, and air quality. In many applications, detailed information about the boundary layer is required at high temporal and...