laser velocimeter flow survey above a stalled wing

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National Aeronautics and Space Administration, Scientific and Technical Information Office, for sale by the National Technial Information Service , [Washington], Springfield, Va
Laser Doppler velocimeter, Flow meters, Stalling (Aerodyna
StatementWarren H. Young, Jr., Structures Laboratory, AVRADCOM Research and Technology Laboratories, Langley Research Center, James F. Meyers, Langley Research Center, Danny R. Hoad, Structures Laboratory, AVRADCOM Research and Technology Laboratories, Langley Research Center
SeriesNASA technical paper ; 1266, AVRADCOM technical report ; 78-50, AVRADCOM technical report -- 78-50
ContributionsMeyers, James F., joint author, Hoad, Danny R., joint author, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office, Army Research and Technology Laboratories (U.S.). Structures Laboratory, Langley Research Center
The Physical Object
Pagination134 p. :
ID Numbers
Open LibraryOL14932123M

A laser velocimeter operating in the backscatter mode was used to survey the flow about a stalled wing installed in the Langley V/STOL tunnel. Mean velocities and magnitudes of velocity fluctuations were calculated from measure- ments of two orthogonal components of velocity.

Free shear mixing layers above. A laser velocimeter operating in the backscatter mode was used to survey the flow about a stalled wing installed in the Langley V/STOL tunnel. Mean velocities and magnitudes of velocity fluctuations were calculated from measurements of two orthogonal components of velocity.

Free shear mixing layers above and below a large separated. BibTeX @MISC{Young_alaser, author = {Warren H. Young and James F. Meyers and Danny R. Hoad}, title = {A Laser Velocimeter Flow Survey Above a Stalled Wing}, year = {}}.

A laser velocimeter operating in the backscatter mode was used to survey the flow about a stalled wing installed in the Langley V/STOL tunnel. Mean velocities and magnitudes of velocity fluctuations were calculated from measurements of two orthogonal components of : J. Meyers, Jr. Young and D. Hoad.

The measurement of the flow field around a wing is another application for which the LV is ideal Iy suited. An example of the complex flow field measured around the same NACA wing, at a = O~ is shown in the upper right of the figure.

The laser velocimeter was able to. Abstract: Laser velocimetry is an optical technique used to make local measurements of mean velocity and turbulence in fluid flows without disturbing them.

Download laser velocimeter flow survey above a stalled wing FB2

Laser velocimetry principles are briefly recalled; the optical and mechanical elements making up a velocimeter are described. Their purpose is to create two laser beams of equal intensity which are focused and crossed in a probe volume.

Laser Doppler Anemometry (LDA) • Single-point optical velocimetry method Study of the flow between rotating impeller blades of a pump 3-D LDA Measurements on a.

A schematic diagram of our high-resolution Doppler velocimeter for remote measurement of liquid and gaseous discharges is shown in Fig. argon ion laser (Coherent, Innova ) is used to excite an actively stabilized ring dye laser (Coherent, Model ), which has been employed as the transmitter.

A vorticity meter of the vane-type has been used in this study for direct and quantitative measurements of vertical flows. The vane calibration procedure is carried out by using measurements deduced from a preliminary cross-wires survey of the flow-field generated in the wake of a half wing set at incidence in the wind tunnel.

Emphasis is placed on the resulting calibration law which relates. Laser Doppler Velocimetery (LDV) is a technique used to measure the instantaneous velocity of a flow field. This technique, like PIV is non-intrusive and can measure all the three velocity components.

The laser Doppler velocimeter sends a monochromatic laser beam toward the target and collects the reflected radiation. The flow field survey was carried out above an aspect-ratio-8 stalled wing with an NACA section.

The angle of attack was deg, the Mach number wasand the Reynolds number was 1, struts to minimize flow disturbance at the wing center line. A photograph of the model with crossing laser beams is presented in figure 5. Local flow velocities were measured about the wing center line at two angles of attack, o and o, to compare with theoretical predictions.

A pitot-static probe was mounted m below and 1 m ahead of. 2) Types of Laser Level. There are a variety of laser levels available, all with different qualities suited to specific needs. If you require a laser level for interior use you may need to use line laser or dot lasers which are better equipped for that type of usage.

James F. Meyers's 33 research works with citations and reads, including: Boundary layer measurements in a supersonic wind tunnel using Doppler global velocimetry.

A time-dependent compressible turbulent Navier-Stokes analysis is applied to the oscillating airfoil flow field problem.

The turbulence model is based upon a turbulence energy equation. Results. Fluid dynamic measurements. Fluid mechanics. Laser Doppler velocimeter. Boutier, A. (Alain) TAM43L dc23 British Library Cataloguing-in-Publication Data A CIP record for this book is available from the British Library ISBN: 1 NASA TECHNI CAL NOTE /^^V^ NASA TN D cj.

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Description laser velocimeter flow survey above a stalled wing FB2

LASER VELOCIMETER SYSTEMS ANALYSIS APPLIED TO A FLOW SURVEY ABOVE A STALLED WING Warren H. Young, Jr., James F. Meyers, and Timothy E. Hepner.^"f^’l". Langley Research Center: ’--’’ "-^/^ and ^./ ’C \ Langley Directorate, ^^ U.S. Army Air. Apparatus and method for measuring Internal Ocular Pressure (IOP) comprises applying a perturbing vibration into an eye over a range of frequencies.

A vibrational response of the surface of the eye is measured such as by using a laser velocimeter, the vibrational response including velocity and rate of change of the phase lag. Further, geometric properties such as volume of the eye are.

A laser velocimeter was used to measure velocities within the impeller and volute of a centrifugal pump.

Measurements were made at four circumferential and eight radial positions. Flow rates ranged from 40 to percent of design flow. Audio Books & Poetry Community Audio Computers, Technology and Science Music, Arts & Culture News & Public Affairs Non-English Audio Spirituality & Religion.

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A laser velocimeter flow survey above a stalled wing / ([Washington]: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: For sale by the National Technical Information Service, ), by Warren H.

Young, Danny R. Hoad, James F. Meyers, Langley Research Center, Army Research and. 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 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.

Warren H. Young, Jr., James F. Meyers and Danny R. Hoad, A Laser Velocimeter Flow Survey Above a Stalled Wing, NASA TP, Decemberpp.(7MB) - Pages: NASAtppdfRead NASAtmpdfNASAtmpdf.

LASER DOPPLER VELOCIMETER 2 IV. INSTRUMENTATION 3 V. ANALYTICAL METHOD 3 VI. EXPERIMENTAL PROCEDURE 4 VII. RESULTS AND DISCUSSION 5 VIII. CONCLUSIONS 6 REFERENCES 7 APPENDIXES I.

ILLUSTRATIONS Figure 1. Low Speed Wind Tunnel 11 2. Wing Mounted in Wind Tunnel Test Section 12 3. Schematic of Dual Scatter Laser Doppler Velocimeter 13 4. instruments, namely the laser doppler velocimeter (LDV) and the laser two-focus velocimeter (L2F).

The principle behind the LDV is depicted schematically in Figure 1. Light from a laser enters a beam splitter following which the two beams are focussed at the location in the flow where a measurement of the velocity is desired.

Spectra Precision Laser LL Automatic Self-leveling Laser Level, Inch Grade Rod (tenths) & Tripod Kit out of 5 stars 58 $ $ 37 $ $ NASAtppdf - Warren H. Young, Jr., James F. Meyers and Danny R.

Hoad, A Laser Velocimeter Flow Survey Above a Stalled Wing, NASA TP, Decemberpp. (7MB) NASAtmpdf - Shelby J. Moore, Jr., Performance Estimation for a Highly Loaded Eight-Blade Propeller Combined With an Advanced Technology Turboshaft Engine, NASA. The measurements were made with a two-component Laser Velocimeter (LV) chord above the plane formed by the path of the rotor tips (tip-path-plane).

A conditional sampling technique was employed to determine the position of the rotor at the time that each velocity measurement was made so that the azimuthal fluctuations in velocity could be.

Laser Velocimeter Measurements of the Flow Fields Around Single- and Counter-Rotation Propeller Models A two-component LV system was used to make detailed measurements of the flowfield around both a single-rotation and a counter-rotation propeller/nacelle.

Laser Technology's core products are engineered with pulse-laser technology (a.k.a. reflectorless measurement technology) resulting in the ability to measure both distances and speeds. We also specialize in tilt and compass sensors, allowing you to measure heights and azimuth bearings.

Portable Laser Velocimeter for Stack Velocity Measurements: Final Report Paperback – J by U. S. Environmental Protection Agency (Creator) See all formats and editions Hide other formats and editions. Price New from Used from Paperback, J Format: Paperback.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.

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Flow seeding with particles is described with currently used products, as well as the appropriate aerosol generators.Time-dependent and time-averaged turbulence structure near the nose of a wing-body junction.

A laser velocimeter flow survey above a stalled wing. NASA Langley Technical Report Server, Google Scholar. Deutsch, S, Zierke, W. The measurement of boundary layers on a compressor blade in cascade: Part 2-suction surface boundary layers.