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Characterization Of Shock Wave Turbulent Boundary Layer Interaction Using Particle Image Velocimetry
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Book Synopsis Characterization of Shock Wave Turbulent Boundary Layer Interaction Using Particle Image Velocimetry by : Douglas E. Ojala
Download or read book Characterization of Shock Wave Turbulent Boundary Layer Interaction Using Particle Image Velocimetry written by Douglas E. Ojala and published by . This book was released on 2012 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for the use of Particle Image Velocimetry in the Rutgers Supersonic Wind Tunnel is established and described. The use of ice crystals as PIV seed material is tested using an oblique shock as a step response to estimate the particle lag time and particle diameter. These values were found to be 2.8 æs and 0.43 æm respectively. The Stokes number was found to be St = 0.11. The statistical properties of the undisturbed boundary layer are determined using PIV data and simplifying assumptions. The boundary layer thickness is? = 15.6mm and the free stream velocity is U1 = 621m/s. This velocity corresponds to an approximate Mach number of 3.22. Using the Clauser method, the shear velocity is u = 22.45m/s. The log-law region has a last reliable point at height y+? 500 and extends to y+? 3000. Velocity fluctuation values and trends are in agreement with published results. Investigation of streamwise XY planes of the boundary layer suggest the existence of coherent structures, particularly hairpin vortices. Galilean decomposition clearly shows vortex structures at height y/??0.2 at a convection velocity of Uc/U? = 0.75. Investigating a spanwise XZ plane at height y/?=0.1 shows coherent regions of high and low velocity which stretch beyond the fleld of view. Shock Wave Turbulent Boundary Layer Interaction is investigated in the case of a 6 and 9 degree angle of attack flat plate used to generate an oblique shock which impinges upon the turbulent boundary layer. In the 9 degree case, an average separated region of the boundary layer exists to be 2.11? long in the streamwise direction and exhibits the characteristics of a strong interaction. Ahead of the separated region, a separation shock shows streamwise motion of about ±0.25?. The 6 degree case shows no boundary layer separation in the mean flow. A reflected shock exhibits reasonably steady behavior which is characteristic of a weak interaction. The sonic line shows that the subsonic layer dilates to a height of y/?=0.27 and y/?=0.7 for the 6 and 9 degree case respectively. In both interactions, the recovery of the boundary layer extends beyond the fleld of view in the streamwise direction.
Book Synopsis Shock Wave-Boundary-Layer Interactions by : Holger Babinsky
Download or read book Shock Wave-Boundary-Layer Interactions written by Holger Babinsky and published by Cambridge University Press. This book was released on 2011-09-12 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.
Book Synopsis Transition Location Effect on Shock Wave Boundary Layer Interaction by : Piotr Doerffer
Download or read book Transition Location Effect on Shock Wave Boundary Layer Interaction written by Piotr Doerffer and published by Springer Nature. This book was released on 2020-07-30 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents experimental and numerical findings on reducing shock-induced separation by applying transition upstream the shock wave. The purpose is to find out how close to the shock wave the transition should be located in order to obtain favorable turbulent boundary layer interaction. The book shares findings obtained using advanced flow measurement methods and concerning e.g. the transition location, boundary layer characteristics, and the detection of shock wave configurations. It includes a number of experimental case studies and CFD simulations that offer valuable insights into the flow structure. It covers RANS/URANS methods for the experimental test section design, as well as more advanced techniques, such as LES, hybrid methods and DNS for studying the transition and shock wave interaction in detail. The experimental and numerical investigations presented here were conducted by sixteen different partners in the context of the TFAST Project. The general focus is on determining if and how it is possible to improve flow performance in comparison to laminar interaction. The book mainly addresses academics and professionals whose work involves the aerodynamics of internal and external flows, as well as experimentalists working with compressible flows. It will also be of benefit for CFD developers and users, and for students of aviation and propulsion systems alike.
Book Synopsis Particle Image Velocimetry by : Andreas Schröder
Download or read book Particle Image Velocimetry written by Andreas Schröder and published by Springer Science & Business Media. This book was released on 2008-01-14 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the main results reached using the EC-funded network PivNet 2. It also presents a survey of the state of the art of scientific research using PIV techniques. You get a clear introduction to the basics of these techniques. The authors then guide you through current and possible future applications for flow analysis, including combustion and supersonic flow. Hundreds of illustrations, many in full color, are provided.
Book Synopsis Particle Image Velocimetry by : Ronald J. Adrian
Download or read book Particle Image Velocimetry written by Ronald J. Adrian and published by Cambridge University Press. This book was released on 2011 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle image velocimetry, or PIV, refers to a class of methods used in experimental fluid mechanics to determine instantaneous fields of the vector velocity by measuring the displacements of numerous fine particles that accurately follow the motion of the fluid. Although the concept of measuring particle displacements is simple in essence, the factors that need to be addressed to design and implement PIV systems that achieve reliable, accurate, and fast measurements and to interpret the results are surprisingly numerous. The aim of this book is to analyze and explain them comprehensively.
Book Synopsis The Study of Shock Wave and Turbulent Boundary Layer Interactions by : Seymour M. Bogdonoff
Download or read book The Study of Shock Wave and Turbulent Boundary Layer Interactions written by Seymour M. Bogdonoff and published by . This book was released on 1986 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three dimensional shock wave turbulent boundary layer interaction generated by several shock generators defined solely by angles has been carried out at a Mach number of 3. Interactions with thin boundary layers were used to obtain overall characteristics, while interactions with thick boundary layers permitted detailed high resolution surveys. Investigations of the interactions were carried out by mean and high frequency surface pressure distribution measurements, surface flow visualization, and mean total head, yaw, and static pressure distributions through the flowfield. Major new data sets were obtained for the interaction of the shock wave generated by a 20 deg fin, and by a 24 deg wedge swept at 60 deg to the incoming flow. A series of tests were carried out to examine new concepts of three-dimensional interactions and extensive 'non-steady' results were obtained from the high frequency surface pressure distributions. Close coordination of the experiments with major computational efforts, support new concepts of flow structure and physics for these complex interactions. Keywords: Three-dimensional shock wave interactions; Conical similarity; Scaling laws; Conical/cylindrical boundary; Unsteady flow; Non-steady characteristics; flow physics and modeling; Supersonic characteristics.
Book Synopsis Measurement of the Nonlinear Spectral Dynamics Characterizing a Shock Wave/turbulent Boundary Layer Interaction by : F. O. Thomas
Download or read book Measurement of the Nonlinear Spectral Dynamics Characterizing a Shock Wave/turbulent Boundary Layer Interaction written by F. O. Thomas and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spectral Element Methods for Shock Wave Turbulent Boundary Layer Interaction Analysis by : K. T. Yoon
Download or read book Spectral Element Methods for Shock Wave Turbulent Boundary Layer Interaction Analysis written by K. T. Yoon and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady flow organization of a SWBLI by : Raymond A. Humble
Download or read book Unsteady flow organization of a SWBLI written by Raymond A. Humble and published by Eburon Uitgeverij B.V.. This book was released on 2008 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of Suction on Shock Wave-turbulent Boundary Layer Interactions for Two-dimensional and Axially Symmetric Flows by : William R. Seebaugh
Download or read book Influence of Suction on Shock Wave-turbulent Boundary Layer Interactions for Two-dimensional and Axially Symmetric Flows written by William R. Seebaugh and published by . This book was released on 1970 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Laminar and Turbulent Boundary Layers Interacting with Externally Generated Shock Waves by : Earl C. Watson
Download or read book Investigation of Laminar and Turbulent Boundary Layers Interacting with Externally Generated Shock Waves written by Earl C. Watson and published by . This book was released on 1969 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laminar and turbulent boundary layer interactions with externally generated shock waves.
Book Synopsis Investigation of Turbulent Boundary-layer Structure Using Particle-image Velocimetry by : Carl Daniel Meinhart
Download or read book Investigation of Turbulent Boundary-layer Structure Using Particle-image Velocimetry written by Carl Daniel Meinhart and published by . This book was released on 1994 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle-image velocimetry (PIV) is used to measure instantaneous velocity fields in the streamwise wall-normal plane of a zero-pressure-gradient turbulent boundary layer. In total, 340 PIV realizations of the boundary layer were obtained at Reynolds numbers based on momentum thickness of Ree = 930, 2370 and 6845. Each realization contains approximately 10000 two-component velocity vectors which are accurate to within 0.4 to 1.0% of the free-stream velocity. The PIV results are used to examine coherent structures throughout the boundary layer and determine their Reynolds-number dependencies. Coherent structures have been an important part of turbulent boundary-layer research for more than thirty years. By understanding coherent structures, their Reynolds-number dependencies and their dynamical characteristics, engineers and scientists will be better able to control and predict turbulent flows. A 20 m long low-turbulence boundary-layer research facility was developed for the measurement of turbulent boundary layers using particle-image velocimetry. Hot-film anemometer measurements show that the turbulence intensities at the test section inlet are about 0.16%, at a free-stream velocity of 6 m/s. A PIV interrogation and vector-validation system was developed to conduct the PIV measurements efficiently. The interrogation system utilizes eight i860 array processors in parallel to achieve a peak aggregate performance of 640 Mflops. Using 128 x 128 pixel cross correlations, it processes 100 vectors per second. Two-dimensional maps of in-plane velocity vectors, spanwise vorticity, Reynolds stress, and streamwise and wall-normal velocity contours show the instantaneous structures in the overlap and outer regions of the boundary layer. Details of large-scale motions protruding into the free stream are clearly shown in the outer region. The overlap region consists of shear layers oriented at 45$spcirc$ from the wall and are associated with transverse vortical elements, which are located above and slightly downstream of the shear layers. Comparisons between measured coherent structures and theories of Theodorsen, Townsend and Perry et al. are given. Two-dimensional spatial correlation functions of streamwise velocity, wall-normal velocity, spanwise vorticity and Reynolds stress are used to examine the statistically relevant structure of the boundary layer and its Reynolds-number dependency. Stochastic estimation is used to estimate conditional eddies throughout the boundary layer and reveal their Reynolds-number dependencies.
Book Synopsis Experimental Studies of Transitional Boundary Layer Shock Wave Interactions by :
Download or read book Experimental Studies of Transitional Boundary Layer Shock Wave Interactions written by and published by . This book was released on 2006 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transitional shock wave/boundary layer interactions are studied with planar imaging techniques. The interaction is generated by a cylinder mounted on a flat plate in a Mach 5 flow. Planar laser scattering (PLS) and particle image velocimetry (PIV) are used to visualize the flow structure. Images are obtained in streamwise-spanwise planes (plan view). Earlier work focused on investigating similar interactions with tripped boundary layers, whereas the current work focuses on the case where transition occurs naturally. One goal of this preliminary study was to see if repeatable interactions could be generated. Imaging was conducted for three downstream locations of the cylinder. The PLS imaging revealed that the transitional interactions resulting from an untripped boundary layer are similar to those generated by tripping. In general it is observed that the separated flow region of transitional interactions exhibits larger variations in their scale and shape than fully turbulent interactions. When the cylinder is farthest upstream (5.3 diameters from leading edge) two types of separation shock are seen: an apparently laminar shock along the plate centerline and a turbulent one in the outboard region. As the cylinder is moved downstream (10.7 diameters), this dual structure is not as apparent, which is consistent with the upstream boundary layer becoming more turbulent. Finally, at 16 diameters downstream the interaction exhibits extreme variations in its shape, which we believe to be caused by sidewall interference. The PIV measurements largely confirm these qualitative observations.
Book Synopsis Interaction Between a Normal Shock Wave and a Turbulent Boundary Layer at High, Transonic Speeds by : Thomas Charles Adamson
Download or read book Interaction Between a Normal Shock Wave and a Turbulent Boundary Layer at High, Transonic Speeds written by Thomas Charles Adamson and published by . This book was released on 1980 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of the Unsteady Behavior in Shockwave Turbulent Boundary Layer Interaction by : Muzio Grilli
Download or read book Analysis of the Unsteady Behavior in Shockwave Turbulent Boundary Layer Interaction written by Muzio Grilli and published by . This book was released on 2013 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781793962911 Total Pages :32 pages Book Rating :4.9/5 (629 download)
Book Synopsis Wind-Us Code Contributions to the First AIAA Shock Boundary Layer Interaction Prediction Workshop by : National Aeronautics and Space Adm Nasa
Download or read book Wind-Us Code Contributions to the First AIAA Shock Boundary Layer Interaction Prediction Workshop written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-13 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report discusses the computations of a set of shock wave/turbulent boundary layer interaction (SWTBLI) test cases using the Wind-US code, as part of the 2010 American Institute of Aeronautics and Astronautics (AIAA) shock/boundary layer interaction workshop. The experiments involve supersonic flows in wind tunnels with a shock generator that directs an oblique shock wave toward the boundary layer along one of the walls of the wind tunnel. The Wind-US calculations utilized structured grid computations performed in Reynolds-averaged Navier-Stokes mode. Four turbulence models were investigated: the Spalart-Allmaras one-equation model, the Menter Baseline and Shear Stress Transport k-omega two-equation models, and an explicit algebraic stress k-omega formulation. Effects of grid resolution and upwinding scheme were also considered. The results from the CFD calculations are compared to particle image velocimetry (PIV) data from the experiments. As expected, turbulence model effects dominated the accuracy of the solutions with upwinding scheme selection indicating minimal effects. Georgiadis, Nicholas J. and Vyas, Manan A. and Yoder, Dennis A. Glenn Research Center WBS 599489.02.07.03.03.13.01
Book Synopsis An Investigation of Shock Wave-boundary Layer Interaction by : Raymond L. Chuan
Download or read book An Investigation of Shock Wave-boundary Layer Interaction written by Raymond L. Chuan and published by . This book was released on 1955 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
