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Author : Charles N. Eastlake
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (761 download)
Download or read book Velocity Irregularities in the Near Field of High Aspect Ratio Turbulent Jets written by Charles N. Eastlake and published by . This book was released on 1972 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Charles N Eastlake (II.)
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (227 download)
Download or read book Velocity Irregularities in the Near Field of High Aspect Ratio Turbulent Jets written by Charles N Eastlake (II.) and published by . This book was released on 1972 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive investigation has been made to determine the cause of irregularities in the near field velocity profiles of turbulent jets issuing from rectangular openings of high aspect ratio. These irregularities are seen to persist for about two exit major diameters downstream. Various means of reducing the nonuniformities are documented, but it does not seem possible to produce completely smooth profiles from orifices or nozzles of this small scale (minor diameter = .060 inch) without manufacturing processes beyond normal tolerances. (Author).
Author :
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ISBN 13 :
Total Pages : 488 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : N. Rajaratnam
Publisher : Elsevier
ISBN 13 : 0080869963
Total Pages : 315 pages
Book Rating : 4.0/5 (88 download)
Download or read book Turbulent Jets written by N. Rajaratnam and published by Elsevier. This book was released on 1976-01-01 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent Jets
Author :
Publisher :
ISBN 13 :
Total Pages : 403 pages
Book Rating : 4.:/5 (227 download)
Download or read book Instabilities in Near Field of Turbulent Jets and Their Dependence on Initial Conditions and Reynolds Number written by and published by . This book was released on 1981 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Near-field pressure and velocity measurements, along with multiple flow visualization techniques, were obtained at several azimuthal positions to establish the effect of initial conditions and Reynolds number on the development and nature of instabilitiues in the initial region of axisymmetric free jets. In cases where the exit boundary layer is laminar, the natural jet is found to be unstable alternately to axisymmetric and helical modes having Strouhal numbers of 0.013 and 0.016, respectively. The scaling of these modes is independent of Reynolds number and initial jet disturbance level. However, the disturbance level does not determine the sensitivity of the initial region to the helical mode. When the initial axisymmetric mode grows to a finite amplitude, a subharmonic resonance mechanism that leads to pairing develops two wavelengths from the jet exit. The axisymmetric and helical modes interact nonlinearly, generating numerous sum and difference modes. With the strong growth of the subharmonic mode, a secondary set of nonlinear interactions develops between the subharmonic mode and the above modes. A strong near-field pressure is associated with each of these instability modes and is coherent with the velocity fluctuations in the jet over the entire growth and decay regions of each mode. The details of this field reveal that pairing is not responsible for a feedback mechanism. This strong near-field pressure acts as a natural excitation to the jet. When the background disturbance is sufficiently low, a natural coupling is observed at special operating conditions where the initial modes are coupled to the mode observed near the end of the potential core of the jet.
Author :
Publisher :
ISBN 13 :
Total Pages : 500 pages
Book Rating : 4.:/5 (319 download)
Download or read book Safety in Mines Abstracts written by and published by . This book was released on 1973 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1368 pages
Book Rating : 4.3/5 (129 download)
Download or read book Government Reports Announcements written by and published by . This book was released on 1973 with total page 1368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 616 pages
Book Rating : 4.0/5 ( download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1987 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. National Advisory Committee for Aeronautics
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ISBN 13 :
Total Pages : pages
Book Rating : 4.F/5 ( download)
Download or read book Annual Report - National Advisory Committee for Aeronautics written by United States. National Advisory Committee for Aeronautics and published by . This book was released on 1957 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes the Committee's Technical reports no. 1-1058, reprinted in v. 1-37.
Author : Clarence L. Gills
Publisher :
ISBN 13 :
Total Pages : 442 pages
Book Rating : 4.3/5 (243 download)
Download or read book Determination of Longitudinal Stability and Control Characteristics from Free-flight Model Tests with Results at Transonic Speeds for Three Airplane Configurations written by Clarence L. Gills and published by . This book was released on 1957 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 258 pages
Book Rating : 4.3/5 (91 download)
Download or read book Hydraulic Research in the United States written by and published by . This book was released on 1966 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alejandro Perez Alvarado
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (964 download)
Download or read book Effect of Background Turbulence on the Scalar Field of a Turbulent Jet written by Alejandro Perez Alvarado and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The effect of background turbulence on the scalar field of an axisymmetric turbulent jet is investigated experimentally. The present investigation builds on the work of Gaskin et al. (2004), who studied the concentration and velocity fields of a plane jet in a shallow coflow with different turbulence levels and Khorsandi et al. (2013), who studied the velocity field of an axisymmetric turbulent jet emitted into a turbulent background. Different driving algorithms for a large RJA were tested and the statistics of the turbulence generated downstream of the RJA were compared to characterize the algorithms' performance. Variations in the spatial configuration of jets operating at any given instant, as well as in the statistics of their on/off times were studied. The algorithm identified as RANDOM generated the closest approximation of zero-mean-flow homogeneous isotropic turbulence. The flow generated by the RANDOM algorithm had a relatively high turbulent Reynolds number (ReT = uTl/[nu] = 2360, where uT is a characteristic RMS velocity, l is the integral length scale of the flow, [nu] is the kinematic viscosity of the water) and the integral length scale (l = 11.6 cm) is the largest reported to date. Thus, RANDOM algorithm was used to generate the background turbulence for the investigation of scalar mixing within a turbulent jet.The effect of background turbulence on the mixing of a passive scalar within a turbulent jet at different Reynolds numbers was investigated. To this end, planar laser-induced fluorescence was employed to obtain concentration measurements of dye (disodium fluorescein, Schmidt number = 2000) within the jet. Two jet Reynolds numbers (Re=UjD/[nu], where Uj is the jet exit velocity, D is the nozzle diameter and [nu] is the kinematic viscosity of the jet fluid, water) were studied: 10600 and 5800. The resulting statistics of the scalar fields showed that the mean concentrations of jets emitted into turbulent backgrounds were lower than those of jets emitted into a quiescent background near the centerline. However, near the edges of the jet (r/x>0.15), the concentrations were higher for the jets issued into turbulent surroundings. The RMS concentrations of the jet emitted into a turbulent background significantly increased. Examination of the probability density functions of concentration revealed a higher degree of intermittency of the scalar field. The probability of low concentrations increased in the presence of background turbulence although the maximum concentrations were comparable to those of the jet emitted into a quiescent background. Flow visualizations revealed meandering of the jet issued into background turbulence, which is associated with the increased probability of lower concentrations and higher intermittency. Additionally, the widths of the jets emitted into a turbulent background were increased. For the lower jet Reynolds number, the described effects were more evident and the jet structure was destroyed by the background turbulence within the measurement region, resulting in flat radial profiles of both the mean and RMS concentrations. Comparison of the results of the scalar field with those of the hydrodynamic jet of Khorsandi et al. (2013) revealed a similar behavior of the two fields. However, the most significant difference was the larger radial extent of the profiles of mean and RMS concentrations, which resulted from the meandering of the jet and increased transport of scalar by turbulent diffusion. The flow visualizations suggest that the entrainment and mixing in the jet in a turbulent background changes with the destruction of jet structure, from jet driven entrainment to become potentially dominated by i) increased lateral advection of the jet by large scales of the background turbulence during the meandering of the jet, which is subsequently mixed by its smaller scales, and ii) turbulent diffusion that is significantly enhanced by the turbulent background." --
Author : United States. National Bureau of Standards
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.:/5 (31 download)
Download or read book Report written by United States. National Bureau of Standards and published by . This book was released on 1966 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1196 pages
Book Rating : 4.:/5 (26 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1963 with total page 1196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Genrikh Naumovich Abramovich
Publisher :
ISBN 13 :
Total Pages : 660 pages
Book Rating : 4.:/5 (319 download)
Download or read book The Theory of Turbulent Jets written by Genrikh Naumovich Abramovich and published by . This book was released on 1963 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Publisher :
ISBN 13 :
Total Pages : 1192 pages
Book Rating : 4.3/5 (91 download)
Download or read book Government Reports Index written by and published by . This book was released on 1973 with total page 1192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G. N. Abramovich
Publisher : Mit Press
ISBN 13 : 9780262511377
Total Pages : 671 pages
Book Rating : 4.5/5 (113 download)
Download or read book The Theory of Turbulent Jets written by G. N. Abramovich and published by Mit Press. This book was released on 1963 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author's first monograph on turbulent jets, in 1936, dealt solely with a free submerged jet. Since that time, the theory of the turbulent jet has been developed in many published works both in the USSR and abroad: it has been enriched with a large amount of experimental material and has been applied in many new fields of engineering. In the last 10 years very substantial progress has been made, and it has now become possible to go beyond the free submerged jet and to solve the problem of a jet in a stream of fluid, to take into account the interaction between the jet and solid walls, to ascertain the relationship between the contour of the jet and the ratio of its density to the density of the surrounding medium, and to establish the characteristic features of a supersonic jet. This monograph contains the results of further research by the author and his colleagues, as well as a critical reappraisal of the more important theoretical and experimental data published by other investigators. The first section deals with the theory of a turbulent jet of incompressible fluid. It gives a systematic analysis of numerous experimental data on velocity profiles, temperature, and the impurity concentration, as well as the outlines of the turbulent mixing lone. The second section sets forth the theory of turbulent gas jets, including strongly preheated and supersonic jets. The theory of free turbulence in a gas, suitable in principle for any degree of compressibility, is revised, and the equations are derived for motion and heat exchange in the boundary layer of a jet at very high temperature. The third section solves several problems of the spreading of jets in finite and semifinite space, and the fourth section describes various applications of the theory of jets, many of which are reported for the first time or have been significantly revised.
