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Author : Allen Norman Grommet
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (748 download)
Download or read book Laser Doppler Velocimeter Signal Processing for Boundary-layer Measurements written by Allen Norman Grommet and published by . This book was released on 1980 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)
Download or read book A Laser Doppler Velocimeter Approach for Near-wall Three-dimensional Turbulence Measurements written by and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722335045
Total Pages : 34 pages
Book Rating : 4.3/5 (35 download)
Download or read book Laser Doppler Velocimeter Measurements of Boundary Layer Velocity and Turbulent Intensities in Mach 2. 5 Flow written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-05 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, the interest in developing a high-speed civil transport has increased. This has led to an increase in research activity on compressible supersonic flows, in particular the boundary layer. The structure of subsonic boundary layers has been extensively documented using conditional sampling techniques which exploit the knowledge of both u and v velocities. Researchers using these techniques have been able to explore some of the complex three-dimensional motions which are responsible for Reynolds stress production and transport in the boundary layer. As interest in turbulent structure has grown to include supersonic flows, a need for simultaneous multicomponent velocity measurements in these flows has developed. The success of conditional analysis in determining the characteristics of coherent motions and structures in the boundary layer relies on accurate, simultaneous measurement of two instantaneous velocity components. Sewell, Jesse and Chew, Larry Unspecified Center NAG1-1402...
Author : William Joseph Yanta
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Use of a Laser Doppler Velocimeter in Supersonic Flow written by William Joseph Yanta and published by . This book was released on 1971 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented for an experimental program which investigated the application of an LDV technique in supersonic flows. This paper presents an analysis of the behavior of light-scattering particles in rapidly accelerating or shock decelerated flows, an evaluation of particle production techniques and the results of several velocity measurements. Measurements included the velocity distribution along the nozzle centerline and flow over a diamond airfoil in a Mach 3 tunnel and velocity profiles for a turbulent boundary layer in a Mach 4.8 facility. It is demonstrated that LDV measurements can be made consistently with errors of less than five percent if the particle lag is considered. (Author).
Author : H.-E. Albrecht
Publisher : Springer Science & Business Media
ISBN 13 : 3662051656
Total Pages : 741 pages
Book Rating : 4.6/5 (62 download)
Download or read book Laser Doppler and Phase Doppler Measurement Techniques written by H.-E. Albrecht and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 741 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing the first comprehensive treatment, this book covers all aspects of the laser Doppler and phase Doppler measurement techniques, including light scattering from small particles, fundamental optics, system design, signal and data processing, tracer particle generation, and applications in single and two-phase flows. The book is intended as both a reference book for more experienced users as well as an instructional book for students. It provides ample material as a basis for a lecture course on the subject and represents one of the most comprehensive treatments of the phase Doppler technique to date. The book will serve as a valuable reference book in any fluid mechanics laboratory where the laser Doppler or phase Doppler techniques are used. This work reflects the authors' long practical experience in the development of the techniques and equipment, as the many examples confirm.
Author : Howard Doyle Thompson
Publisher :
ISBN 13 :
Total Pages : 586 pages
Book Rating : 4.F/5 ( download)
Download or read book Laser Velocimetry and Particle Sizing written by Howard Doyle Thompson and published by . This book was released on 1979 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: A Historical Review of Laser Velocimetry. Developments in Instrumentation, Data Analysis, Combustion Measurements, Measurements in Turbulent Flows, Measurements in Internal Combustion Engines, General Applications, Particle Diagnostics, Wild Card Session, and Panel Discussion.
Author : J. C. Schedvin
Publisher :
ISBN 13 :
Total Pages : 57 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Development of a Diode Laser Doppler Velocimeter for Boundary Layer Measurements Under Ice: A Feasibility Investigation written by J. C. Schedvin and published by . This book was released on 1984 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the turbulent fluxes of momentum, heat, and salinity in the oceanic boundary layer are difficult to obtain, as both a stable platform and high-resolution instrumentation are required. The overall objective of the present investigation, was to develop a boundary layer instrumentation system capable of measuring turbulent fluxes in the marginal ice zone environment. This investigation focuses on a feasibility study toward development of a diode laser Doppler velocimeter (DLDV) to be used as the velocity sensor for a high-resolution velocity/temperature/conductivity cluster, with a spatial resolution of 1 to 2 cm. Phase I findings show very promising results for the DLDV in laboratory environments. Measurements in a pipe flow facility demonstrated very distinctive Doppler burst signals, with more than adequate signal-to-noise ratio, even in clean tap water passed through a 10 micrometer filter. Excellent burst density was observed when a small quantity of Puget Sound water was added to the tap water. For all practical purposes, the performance of the DLDV is at least as good as that of a well-established LDV system using a helium-neon laser as the light source.
Author : Warren H. Stevenson
Publisher :
ISBN 13 :
Total Pages : 580 pages
Book Rating : 4.:/5 (318 download)
Download or read book The Use of the Laser Doppler Velocimeter for Flow Measurements written by Warren H. Stevenson and published by . This book was released on 1972 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ronald J. Adrian
Publisher :
ISBN 13 :
Total Pages : 554 pages
Book Rating : 4.3/5 (91 download)
Download or read book Laser Techniques and Applications in Fluid Mechanics written by Ronald J. Adrian and published by . This book was released on 1993 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ronald J. Adrian
Publisher : SPIE-International Society for Optical Engineering
ISBN 13 :
Total Pages : 644 pages
Book Rating : 4.E/5 ( download)
Download or read book Selected Papers on Laser Doppler Velocimetry written by Ronald J. Adrian and published by SPIE-International Society for Optical Engineering. This book was released on 1993 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. Durst
Publisher :
ISBN 13 :
Total Pages : 456 pages
Book Rating : 4.3/5 (91 download)
Download or read book Principles and Practice of Laser-Doppler Anemometry written by F. Durst and published by . This book was released on 1981 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ricky E. Wilson
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (227 download)
Download or read book Steady Flow Field Measurements Using Laser Doppler Velocimetry written by Ricky E. Wilson and published by . This book was released on 1987 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer-integrated LDV system utilizing a Helium-Neon laser was designed, assembled and tested for use in the study of steady flow field quantities. All system elements were integrated to include a traverse mechanism, signal processing and conditioning, computer interface and display. The system was initially calibrated utilizing a rotating wheel of known velocity. Experimental flow measurement tests of the system were conducted across a conventional free jet flow and in the Naval Postgraduate School low speed wind tunnel. The flow field velocity measurements made in the wind tunnel were verified usin an existing pressure data acquisition station and a standard pitot static probe. Keywords: Laser doppler velocimetry.
Author : Timothy C. Roesler
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (227 download)
Download or read book Investigation of Bias Errors in Laser Doppler Velocimeter Measurements written by Timothy C. Roesler and published by . This book was released on 1980 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of velocity bias laser Doppler Velocimeter (LDV) measurements made with counter type (burst) signal processors in turbulent flows was investigated. By using a signal processing technique which allowed velocity samples to be taken either randomly or at equal time intervals, the magnitude of the velocity bias was directly measured under various flow conditions. Using this technique, the validity of the one-dimensional velocity weighting correction of McLaughlin an Tiederman was investigated and found to be useful only at turbulence intensities below about 20 percent. Incomplete signal bias was also investigated and found to cause serious errors in unshifted LDV measurements. However, this bias may be virtually eliminated by frequency shifting. (Author).
Author : Yoshihisa Aizu
Publisher : Springer
ISBN 13 : 3540282157
Total Pages : 220 pages
Book Rating : 4.5/5 (42 download)
Download or read book Spatial Filtering Velocimetry written by Yoshihisa Aizu and published by Springer. This book was released on 2006-01-04 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: The invention of lasers in the early 1960s enhanced the rapid development of optoelectronics which had introduced various optical measurement methods. A typical example of the methods is found in measurements of velocity. It is well recognized that optical velocity measuring methods have important advantages, such as noncontacting and nondisturbing operations, over c- ventional methods employed previously. These fundamental advantages are indicated by the enormous research e?ort which has gone into their devel- ment for many years. One of the optical methods proposed and studied to measure the velocity is laser Doppler velocimetry which was proposed in the early 1960s and extensively studied by many investigators and is at present applied to practical uses. Another is spatial ?ltering velocimetry which was also proposed in the early 1960s and studied by a number of investigators. In comparison with laser Doppler velocimetry, spatial ?ltering velocimetry had not received much attention from investigators but was studied steadily by several research groups mainly in Japan and is now practically used in various ?elds of engineering. Several important books on laser Doppler velocimetry have already been published, but there has been no book on spatial ?ltering velocimetry. This book is the ?rst contribution to spatial ?ltering velocimetry. Therefore, the Introduction of Chapter 1 provides in detail a historical review of spatial ?ltering velocimetry, relating it to other optical methods and discussing its practical relevance. In the book following Chap.
Author :
Publisher :
ISBN 13 :
Total Pages : 205 pages
Book Rating : 4.:/5 (227 download)
Download or read book Application of a Novel Laser-Doppler Velocimeter for Turbulence: Structural Measurements in Turbulent Boundary Layers written by and published by . This book was released on 2006 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: An advanced laser-Doppler velocimeter (LDV), deemed the 'comprehensive LDV', is designed to acquire fully-resolved turbulence structural measurements in high Reynolds number two- and three-dimensional turbulent boundary layers. The new instrument combines, for the first time, new techniques allowing for the direct measurement of particle acceleration and sub-measurement-volume-scale position resolution so that second-order 3D particle trajectories may be measured at high repetitions. Using these measurements, several terms in the Reynolds stress transport equations may be directly estimated, giving new data for modeling and understanding the processes leading to the transport of turbulence in boundary layer flows. Measurements utilizing the CompLDV technologies are presented and include turbulence dissipation rate and fluctuating velocity-pressure gradient correlations that have been measured in 2D and 3D turbulent boundary layers using the unique capabilities of the 'comprehensive' LDV. Many of these measurements are the first of their kind ever acquired in high Reynolds number turbulent flows. The flat-plate turbulent boundary layer is studied at several Reynolds numbers up to Re-theta ~7500 to examine Reynolds numbers effects on terms such as the velocity-pressure gradient correlation and the dissipation rate in the Reynolds transport equations. Measurements are also presented in a pressure-driven three-dimensional turbulent boundary layer created upstream from a wing-body junction. The current results complement the extensive data from previous studies and provide even richer depth of knowledge on the most completely-documented 3D boundary layer flow in existence. Further measurements include the effects of high free-stream turbulence on flat plate turbulent boundary layers and a wing/body junction flow that is similar to a gas turbine flow.
Author : Jeffrey L. Gorney
Publisher :
ISBN 13 :
Total Pages : 59 pages
Book Rating : 4.:/5 (227 download)
Download or read book Laser Doppler Velocimeter Measurements of the Two-Dimensional Boundary Layers on a Projectile Shape at Mach 3 written by Jeffrey L. Gorney and published by . This book was released on 1982 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional boundary layer velocity profiles, as well as pressure distributions, turbulence intensities, and Reynolds stresses were measured on a six-caliber secant-ogive model for angles of attack of 0 deg, 2 deg. Test conditions were a Reynolds number of 2.7 times 10 to the sixth feet, Mach number of 3.2, and a P of 20 psia.
Author :
Publisher :
ISBN 13 :
Total Pages : 778 pages
Book Rating : 4.F/5 ( download)
Download or read book Laser Anemometry written by and published by . This book was released on 1989 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:
