Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Doppler Global Velocimeter Development For The Large Wind Tunnels At Ames Research Center
Download Doppler Global Velocimeter Development For The Large Wind Tunnels At Ames Research Center full books in PDF, epub, and Kindle. Read online Doppler Global Velocimeter Development For The Large Wind Tunnels At Ames Research Center ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781729330098 Total Pages :62 pages Book Rating :4.3/5 (3 download)
Book Synopsis Doppler Global Velocimeter Development for the Large Wind Tunnels at Ames Research Center by : National Aeronautics and Space Adm Nasa
Download or read book Doppler Global Velocimeter Development for the Large Wind Tunnels at Ames Research Center written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-27 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of an optical, laser-based flow-field measurement technique for large wind tunnels is described. The technique uses laser sheet illumination and charged coupled device detectors to rapidly measure flow-field velocity distributions over large planar regions of the flow. Sample measurements are presented that illustrate the capability of the technique. An analysis of measurement uncertainty, which focuses on the random component of uncertainty, shows that precision uncertainty is not dependent on the measured velocity magnitude. For a single-image measurement, the analysis predicts a precision uncertainty of +/-5 m/s. When multiple images are averaged, this uncertainty is shown to decrease. For an average of 100 images, for example, the analysis shows that a precision uncertainty of +/-0.5 m/s can be expected. Sample applications show that vectors aligned with an orthogonal coordinate system are difficult to measure directly. An algebraic transformation is presented which converts measured vectors to the desired orthogonal components. Uncertainty propagation is then used to show how the uncertainty propagates from the direct measurements to the orthogonal components. For a typical forward-scatter viewing geometry, the propagation analysis predicts precision uncertainties of +/-4, +/-7, and +/-6 m/s, respectively, for the U, V, and W components at 68% confidence. Reinath, Michael S. Ames Research Center...
Book Synopsis Doppler Global Velocimeter Development for the Large Wind Tunnels at Ames Research Center by :
Download or read book Doppler Global Velocimeter Development for the Large Wind Tunnels at Ames Research Center written by and published by . This book was released on 1997 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Doppler Global Velocimeter Development For The Large Wind Tunnels At Ames Research Center... NASA-TM-112210... Oct. 31, 1997 by : United States. National Aeronautics and Space Administration
Download or read book Doppler Global Velocimeter Development For The Large Wind Tunnels At Ames Research Center... NASA-TM-112210... Oct. 31, 1997 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1998* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720569329 Total Pages :30 pages Book Rating :4.5/5 (693 download)
Book Synopsis Hardening Doppler Global Velocimetry Systems for Large Wind Tunnel Applications by : National Aeronautics and Space Administration (NASA)
Download or read book Hardening Doppler Global Velocimetry Systems for Large Wind Tunnel Applications written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of Doppler Global Velocimetry from a laboratory curiosity to a wind tunnel instrumentation system is discussed. This development includes system advancements from a single velocity component to simultaneous three components, and from a steady state to instantaneous measurement. Improvements to system control and stability are discussed along with solutions to real world problems encountered in the wind tunnel. This on-going development program follows the cyclic evolution of understanding the physics of the technology, development of solutions, laboratory and wind tunnel testing, and reevaluation of the physics based on the test results.Meyers, James F. and Lee, Joseph W. and Fletcher, Mark T. and South, Bruce W.Langley Research CenterHARDENING (SYSTEMS); WIND TUNNEL APPARATUS; LASER DOPPLER VELOCIMETERS; CCD CAMERAS; CALIBRATING; IODINE LASERS; ROTORS; NEODYMIUM LASERS; YAG LASERS; SUBSONIC WIND TUNNELS
Book Synopsis Laser Velocimetry in the Low-speed Wind Tunnels at Ames Research Center by :
Download or read book Laser Velocimetry in the Low-speed Wind Tunnels at Ames Research Center written by and published by . This book was released on 1984 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Doppler Global Velocimetry for Wind Tunnel Testing by : James F. Meyers
Download or read book Development of Doppler Global Velocimetry for Wind Tunnel Testing written by James F. Meyers and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Velocimetry in Fluid Mechanics by : Alain Boutier
Download or read book Laser Velocimetry in Fluid Mechanics written by Alain Boutier and published by John Wiley & Sons. This book was released on 2013-01-09 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: In fluid mechanics, velocity measurement is fundamental in order to improve the behavior knowledge of the flow. Velocity maps help us to understand the mean flow structure and its fluctuations, in order to further validate codes. Laser velocimetry is an optical technique for velocity measurements; it is based on light scattering by tiny particles assumed to follow the flow, which allows the local fluid flow velocity and its fluctuations to be determined. It is a widely used non-intrusive technique to measure velocities in fluid flows, either locally or in a map. This book presents the various techniques of laser velocimetry, as well as their specific qualities: local measurements or in plane maps, mean or instantaneous values, 3D measurements. Flow seeding with particles is described with currently used products, as well as the appropriate aerosol generators. Post-processing of data allows us to extract synthetic information from measurements and to perform comparisons with results issued from CFD codes. The principles and characteristics of the different available techniques, all based on the scattering of light by tiny particles embedded in the flow, are described in detail; showing how they deliver different information, either locally or in a map, mean values and turbulence characteristics.
Book Synopsis Hardening Doppler Global Velocimetry Systems for Large Wind Tunnel Applications by : James F. Meyers
Download or read book Hardening Doppler Global Velocimetry Systems for Large Wind Tunnel Applications written by James F. Meyers and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a New Laser Doppler Velocimeter for the Ames High Reynolds Channel No. 2 by :
Download or read book Development of a New Laser Doppler Velocimeter for the Ames High Reynolds Channel No. 2 written by and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781729330302 Total Pages :56 pages Book Rating :4.3/5 (33 download)
Book Synopsis Doppler Global Velocimetry: Development of a Flight Research Instrumentation System for Application to Non-Intrusive Measurements of the Flow Fiel by : National Aeronautics and Space Adm Nasa
Download or read book Doppler Global Velocimetry: Development of a Flight Research Instrumentation System for Application to Non-Intrusive Measurements of the Flow Fiel written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-27 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doppler Global Velocimetry (DGV) is a new diagnostic tool that offers potential for flow field measurements in flight by acquiring three-component velocity data in near real-time during flight maneuvers. The feasibility of implementation of a flight DGV system aboard NASA's High-Angle-of-Attack Research Vehicle (HARV) was addressed in this work by identifying the essential characteristics of a flight measurement system and by performing calibration and error tests. Results from this work were: an outline that establishes a preliminary basis for system configurations by analyzing measurement errors, installation issues, and operating requirements; measurement of the accuracy of the DGV technique using a laboratory breadboard DGV system based on a frequency-doubled Nd: YAG laser and iodine Absorption Line Filter (ALF), which showed excellent agreement between the DGV data and pilot measurements on a laminar flow jet with velocities of up to 150 m/sec; a survey of DGV system components and technologies that are relevant to the design of a flight measurement system, including a survey of cameras for the next generation DGV receivers; an assessment of the candidate lasers and absorption line filters for the flight system, resulting in a near-term recommendation of Nd: host lasers and an iodine ALF for both flight and wind tunnel applications. Komine, Hiroshi and Brosnan, Stephen J. and Long, William H. and Stappaerts, Eddy A. Unspecified Center...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722360061 Total Pages :56 pages Book Rating :4.3/5 (6 download)
Book Synopsis Doppler Global Velocimetry by : National Aeronautics and Space Administration (NASA)
Download or read book Doppler Global Velocimetry written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doppler Global Velocimetry (DGV) is a new diagnostic tool that offers potential for flow field measurements in flight by acquiring three-component velocity data in near real-time during flight maneuvers. The feasibility of implementation of a flight DGV system aboard NASA's High-Angle-of-Attack Research Vehicle (HARV) was addressed in this work by identifying the essential characteristics of a flight measurement system and by performing calibration and error tests. Results from this work were: an outline that establishes a preliminary basis for system configurations by analyzing measurement errors, installation issues, and operating requirements; measurement of the accuracy of the DGV technique using a laboratory breadboard DGV system based on a frequency-doubled Nd: YAG laser and iodine Absorption Line Filter (ALF), which showed excellent agreement between the DGV data and pilot measurements on a laminar flow jet with velocities of up to 150 m/sec; a survey of DGV system components and technologies that are relevant to the design of a flight measurement system, including a survey of cameras for the next generation DGV receivers; an assessment of the candidate lasers and absorption line filters for the flight system, resulting in a near-term recommendation of Nd: host lasers and an iodine ALF for both flight and wind tunnel applications. Komine, Hiroshi and Brosnan, Stephen J. and Long, William H. and Stappaerts, Eddy A. Unspecified Center...
Book Synopsis A Laser Velocimeter System for Large-scale Aerodynamic Testing by :
Download or read book A Laser Velocimeter System for Large-scale Aerodynamic Testing written by and published by . This book was released on 1984 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Doppler Global Velocimetry Measurements for Supersonic Flow Fields by : James F. Meyers
Download or read book Doppler Global Velocimetry Measurements for Supersonic Flow Fields written by James F. Meyers and published by BiblioGov. This book was released on 2013-07 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of Doppler Global Velocimetry (DGV) to high-speed flows has its origins in the original development of the technology by Komine et al (1991). Komine used a small shop-air driven nozzle to generate a 200 m/s flow. This flow velocity was chosen since it produced a fairly large Doppler shift in the scattered light, resulting in a significant transmission loss as the light passed through the Iodine vapor. This proof-of-concept investigation showed that the technology was capable of measuring flow velocity within a measurement plane defined by a single-frequency laser light sheet. The effort also proved that velocity measurements could be made without resolving individual seed particles as required by other techniques such as Fringe- Type Laser Velocimetry and Particle Image Velocimetry. The promise of making planar velocity measurements with the possibility of using 0.1-micron condensation particles for seeding, Dibble et al (1989), resulted in the investigation of supersonic jet flow fields, Elliott et al (1993) and Smith and Northam (1995) - Mach 2.0 and 1.9 respectively. Meyers (1993) conducted a wind tunnel investigation above an inclined flat plate at Mach 2.5 and above a delta wing at Mach 2.8 and 4.6. Although these measurements were crude from an accuracy viewpoint, they did prove that the technology could be used to study supersonic flows using condensation as the scattering medium. Since then several research groups have studied the technology and developed solutions and methodologies to overcome most of the measurement accuracy limitations.
Book Synopsis 37th AIAA Aerospace Sciences Meeting and Exhibit by :
Download or read book 37th AIAA Aerospace Sciences Meeting and Exhibit written by and published by . This book was released on 1999 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development and Utilization of a Laser Velocimeter System for a Large Transonic Wind Tunnel by : Robert J. Freedman
Download or read book Development and Utilization of a Laser Velocimeter System for a Large Transonic Wind Tunnel written by Robert J. Freedman and published by . This book was released on 1982 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781725724419 Total Pages :36 pages Book Rating :4.7/5 (244 download)
Book Synopsis Doppler Global Velocimetry by : National Aeronautics and Space Administration (NASA)
Download or read book Doppler Global Velocimetry written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-17 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new measurement technique is being developed by NASA to measure off-surface flow fields. This method, Doppler global velocimetry, will allow quantification of complex three-dimensional flow fields at video camera rates. The entire flow field structure within a selected plane is measured simultaneously rather than by scanned, point-by-point measurements using conventional laser velocimetry. To assess the capability of this new technique, velocity measurements of the vortical flow field above a thin 75-degree delta wing were made in the NASA Langley Basic Aerodynamics Research Tunnel. The operation of the system is described along with the techniques developed to process the output images. The results are then compared with similar measurements obtained using a three component laser velocimeter. Meyers, James F. Langley Research Center ...
Book Synopsis AIAA Journal by : American Institute of Aeronautics and Astronautics
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 2005 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
