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Turbulence Measurements In The Boundary Layer Of A Low Speed Wind Tunnel Using Laser Velocimetry
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Book Synopsis Turbulence Measurements in the Boundary Layer of a Low-speed Wind Tunnel Using Laser Velocimetry by : Edward T. Schairer
Download or read book Turbulence Measurements in the Boundary Layer of a Low-speed Wind Tunnel Using Laser Velocimetry written by Edward T. Schairer and published by . This book was released on 1980 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence Measurements with a Laser Doppler Velocimeter by : William Joseph Yanta
Download or read book Turbulence Measurements with a Laser Doppler Velocimeter written by William Joseph Yanta and published by . This book was released on 1973 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence measurements with a Laser Doppler Velocimeter (LDV) using the dual scatter or differential Doppler mode have been made in a subsonic, fully developed channel flow. The measurements were made using only those light scattering particles occurring naturally in air. Results include mean velocity profiles, turbulence intensities, Reynolds stress distributions and a skewness measurement of the velocity distribution function across the channel. Statistical techniques were used to obtain the various turbulence parameters. Guidelines have been established for the amount of data needed to obtain results with a specified accuracy and confidence level. Measurements have also been made to determine the particle-size distribution. An aerodynamic means was used to determine the size distribution, in contrast to the usual optical procedures. (Modified author abstract).
Book Synopsis Experimental Investigation of Turbulent Boundary Layer with Uniform Blowing at Moderate and High Reynolds Numbers by : Gazi Hasanuzzaman
Download or read book Experimental Investigation of Turbulent Boundary Layer with Uniform Blowing at Moderate and High Reynolds Numbers written by Gazi Hasanuzzaman and published by Cuvillier Verlag. This book was released on 2022-01-18 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental investigation in turbulent boundary layer flows represents one of the canonical geometries of wall bounded shear flows. Utmost relevance of such experiments, however, is applied in the engineering applications in aerospace and marine industries. In particular, continuous effort is being imparted to explore the underlying physics of the flow in order to develop models for numerical tools and to achieve flow control. Flow control experiments have been widely investigated since 1930’s. Several flow control technique has been explored and have shown potential benefit. But the choice of control technique depends largely on the boundary condition and the type of application. Hence, friction drag of subsonic transport aircraft is intended to be reduced within the scope of this Ph. D. topic. Therefore, application of active control method such as microblowing effect in the incompressible, zero pressure gradient turbulent boundary layer was investigated. A series of experiments have been performed in two different wind tunnel facilities. Wind tunnel from Department of Aerodynamics and Fluid Mechanics (LAS) was used for the measurements for moderate Reynolds number range in co-operation with the wind tunnel from Laboratoire de M´ecanique de Feiret Lille for large Reynolds number range. Measurements are conducted with the help of state-of-the-art techniques such as Laser Doppler Anemometry, Particle Image Velocimetry and electronic pressure sensors.
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 Turbulence Measurements in High-speed Wind Tunnels Using Focusing Laser Differential Interferometry by : Matthew Fulghum
Download or read book Turbulence Measurements in High-speed Wind Tunnels Using Focusing Laser Differential Interferometry written by Matthew Fulghum and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Characterization of freestream disturbances and their effect on laminar boundary layer transition is of great importance in high-speed wind tunnel testing, where significant differences between the behavior of scale-model and free-flight transition have long been noted. However, the methods traditionally used to perform this characterization in low-speed flows present significant difficulties when applied to supersonic and especially hypersonic wind tunnels. The design and theory of a focusing laser differential interferometer (FLDI) instrument, originally invented by Smeets at the Institut Saint-Louis in the 1970s and used recently by Parziale in the CalTech T5 shock tunnel, is presented. It is a relatively-simple, non-imaging common-path interferometer for measuring refractive signals from transition and turbulence, and it has a unique ability to look through facility windows, ignore sidewall boundary-layers and vibration, and concentrate only on the refractive signal near a pair of sharp beam foci in the core flow. The instrument's low cost and ease of implementation make it a promising alternative to traditional hot-wire anemometry and particle-based methods for turbulence characterization. Benchtop experiments using a turbulent supersonic air jet demonstrate its focusing ability, frequency response, unwanted signal rejection, and ease of use. The instrument is used to optically interrogate the flow in the Penn State University Supersonic Wind Tunnel and USAF AEDC Hypervelocity Tunnel 9 for measurement of the overall intensity and spectra of freestream disturbances. Precise characterization of the strength and spectral content of the disturbances provides insight into their nature and potential effect upon boundary layer transition. A special feature of the FLDI instrument used here is the replacement of traditional fixed Wollaston prisms with variable Sanderson prisms for laser-beam separation and recombination.
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)
Book Synopsis Laser Doppler Velocimeter Measurements of Boundary Layer Velocity and Turbulent Intensities in Mach 2. 5 Flow by : National Aeronautics and Space Administration (NASA)
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...
Book Synopsis A Laser Doppler Velocimeter Approach for Near-wall Three-dimensional Turbulence Measurements by :
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:
Book Synopsis Turbulence Measurements with a Laser Doppler Velocimeter by : William J. Yanta
Download or read book Turbulence Measurements with a Laser Doppler Velocimeter written by William J. Yanta and published by . This book was released on 1973 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence measurements with a Laser Doppler Velocimeter (LDV) using the dual scatter or differential Doppler mode have been made in a subsonic, fully developed channel flow. The measurements were made using only those light scattering particles occurring naturally in air. Results include mean velocity profiles, turbulence intensities, Reynolds stress distributions and a skewness measurement of the velocity distribution function across the channel. Statistical techniques were used to obtain the various turbulence parameters. Guidelines have been established for the amount of data needed to obtain results with a specified accuracy and confidence level. Measurements have also been made to determine the particle-size distribution. An aerodynamic means was used to determine the size distribution, in contrast to the usual optical procedures. (Modified author abstract).
Book Synopsis Turbulent Boundary Layer Measurement Techniques by : F. Kevin Owen
Download or read book Turbulent Boundary Layer Measurement Techniques written by F. Kevin Owen and published by . This book was released on 1986 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews the principles and practice of hot wire anemometry for the measurement of turbulent flows. The requirements and pitfalls involved in the use of hot wire anemometers in sypersonic flows are addressed and the methods used for data acquisition and reduction are detailed. Examples of measurements obtained in AFWAL facilities are presented. Unfortunately in most flows of practical interest, local fluctuation levels exceed those for which reliable hot wire turbulence measurements can be expected. However, our recent developments in laser velocimetry facilitate the non-intrusive, linear measurement of high speed turbulent flows. Measurements of zero pressure gradient and ramp induced adverse pressure gradient flows are presented. The results emphasize the need for combined hot wire and laser velocimeter studies to determine the reliable and useful ranges of both instruments.
Book Synopsis Measurements of Boundary-layer Transition at Low Speed on Two Bodies of Revolution in a Low-turbulence Wind Tunnel by : Frederick W. Boltz
Download or read book Measurements of Boundary-layer Transition at Low Speed on Two Bodies of Revolution in a Low-turbulence Wind Tunnel written by Frederick W. Boltz and published by . This book was released on 1956 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the location of transition from laminar to turbulent flow in the boundary layer on two bodies of revolution at zero angle of attack has been made in a low-turbulence wind tunnel. One body was a prolate spheroid of fineness ratio 9.0 and was constructed of aluminum. The outer body, a modified prolate spheroid of fineness ratio 7.5 was constructed of steel and covered with Fiberglas resin. Both bodies were instrumented with subsurface microphones to detect the location of transition from laminar to turbulent flow in the boundary layer.
Book Synopsis Near-wall, Three-dimensional Turbulence Measurements: A Challenge for Laser Velocimetry by :
Download or read book Near-wall, Three-dimensional Turbulence Measurements: A Challenge for Laser Velocimetry written by and published by . This book was released on 1989 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Wind-tunnel Study of Low-speed Turbulent Boundary Layer Flow Over a Rough-to-smooth Surface Transition with and Without Two-dimensional Vortex Generators by : John Patrick Burke
Download or read book A Wind-tunnel Study of Low-speed Turbulent Boundary Layer Flow Over a Rough-to-smooth Surface Transition with and Without Two-dimensional Vortex Generators written by John Patrick Burke and published by . This book was released on 1981 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Use of a Laser Doppler Velocimeter in Supersonic Flow by : William Joseph Yanta
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).
Book Synopsis Compressible Turbulence Measurements in a Supersonic Boundary Layer with Impinging Shock Wave Interaction by : Michael J. Meyer
Download or read book Compressible Turbulence Measurements in a Supersonic Boundary Layer with Impinging Shock Wave Interaction written by Michael J. Meyer and published by . This book was released on 1996-03-01 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study used laser Doppler velocimetry techniques to measure the turbulence intensities and Reynolds shear stresses in a Mach 2.9 turbulent flat plate with an impinging shock wave. The shock strength was varied, using three wedge shock generators with turning angles of 50, 70, and 100. Each flow field was studied at four locations, X = %1.326o, 06o, 1.326o, 2.64%, relative to the shock wave/boundary layer interaction. An additional streamwise profile, parallel to the wall at a height of = 0.66. This study showed that the velocity fluctuations (%, %) were energized by the shock wave/boundary layer interaction, and while remaining at a higher value than the upstream stations, decreased in value with distance downstream of the interaction. The Reynolds shear stress - %pu'v' followed a similar pattern, sharply increasing immediately after the interaction and dissipating with distance downstream of the interaction.
Book Synopsis Flow Visualization and Laser Velocimetry for Wind Tunnels by : William W. Hunter
Download or read book Flow Visualization and Laser Velocimetry for Wind Tunnels written by William W. Hunter and published by . This book was released on 1982 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of a Novel Laser-Doppler Velocimeter for Turbulence: Structural Measurements in Turbulent Boundary Layers by :
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.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
