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Investigation Of Axisymmetric Confined Turbulent Jet Mixing In The Near Region With Adverse Pressure Gradient
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Book Synopsis Investigation of Axisymmetric Confined Turbulent Jet Mixing in the Near Region with Adverse Pressure Gradient by : Dong Whan Choi
Download or read book Investigation of Axisymmetric Confined Turbulent Jet Mixing in the Near Region with Adverse Pressure Gradient written by Dong Whan Choi and published by . This book was released on 1983 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Mixing in the Initial Region of Heterogeneous Axisymmetric Coaxial Confined Jets by : Kirti N. Ghia
Download or read book Turbulent Mixing in the Initial Region of Heterogeneous Axisymmetric Coaxial Confined Jets written by Kirti N. Ghia and published by . This book was released on 1970 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analytical Investigation of Confined Turbulent Mixing of Jets by : Kirti N. Ghia
Download or read book Analytical Investigation of Confined Turbulent Mixing of Jets written by Kirti N. Ghia and published by . This book was released on 1972 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The turbulent mixing of confined axisymmetric incompressible jets was studied, using the turbulent boundary layer equations in terms of transformed von Mises variables, with semi-empirical formulations of the turbulent transport coefficients. The solution was obtained by the method of finite differences. Analytical predictions of the jet mixing flow fields were obtained for several configurations, covering a resonably wide range of values of the problem parameters. A turbulent mixing model which satisfactorily predicts mean flow profiles for a reasonably broad spectrum of flow conditions has been formulated.
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 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analytical Study of Confined Laminar and Turbulent Jet Mixing with Boundary-Layer Growth by : Lynn A. Atkinson
Download or read book Analytical Study of Confined Laminar and Turbulent Jet Mixing with Boundary-Layer Growth written by Lynn A. Atkinson and published by . This book was released on 1972 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: A analytical study of laminar and turbulent jet mixing in a straight parallel wall channel was made using three different initial velocity profiles. The system of governing equations describing the flow was solved using a implicit finite-difference technique. The governing equations were reduced to a set of linear algbraic equations that were solved simultaneously on a digital computer. The development of the axial velocity profiles and the jet mixing spreading rates for the three cases are compared. For the laminar cases, the momentum flux increased when a negative pressure gradient was present. For the turbulent jet mixing cases, the boundary-layer growth is laminar, and the analysis is restricted to the initial region. (Author).
Book Synopsis An Investigation of Ducted, Two-stream, Variable-density, Turbulent Jet Mixing with Recirculation by : Roy J. Schulz
Download or read book An Investigation of Ducted, Two-stream, Variable-density, Turbulent Jet Mixing with Recirculation written by Roy J. Schulz and published by . This book was released on 1977 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted of two-stream, variable-density, turbulent jet mixing with recirculation confined within an axisymmetric duct that simulated a combustor configuration. The recirculating flow fields in the combustor simulator were the result of coaxial jet mixing between a central, primary air stream with a velocity of about 650 ft/sec and an annular secondary stream of hydrogen with velocities of 13, 23, or 48 ft/sec, depending on the desired test conditions. Experimental measurements are presented of radial distributions of time-averaged axial velocity and hydrogen mass fraction, axial distributions of time-averaged static pressure on the duct wall, axial velocity on the duct centerline, and hydrogen mass fraction on the duct wall and on the duct centerline. A theoretical study of the experimental flows was also conducted using a finite difference numerical solution technique for the calculation of viscous, recirculating flows. Comparison of theory and experiment shows that the predictive technique and the turbulence transport model require further development before accurate prediction of recirculating turbulent flows can be realized.
Book Synopsis A Numerical Study of Confined Turbulent Jets by :
Download or read book A Numerical Study of Confined Turbulent Jets written by and published by . This book was released on 1993 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analytical Study of Confined Laminar and Turbulent Jet Mixing with Boundary-layer Growth by : Lynn A. Atkinson (CAPT, USAF.)
Download or read book Analytical Study of Confined Laminar and Turbulent Jet Mixing with Boundary-layer Growth written by Lynn A. Atkinson (CAPT, USAF.) and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Mixing of a Confined Axisymmetric Jet. Part I. Nonseparating Conditions by : John A. Brighton
Download or read book Turbulent Mixing of a Confined Axisymmetric Jet. Part I. Nonseparating Conditions written by John A. Brighton and published by . This book was released on 1969 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high velocity air jet (primary) was directed into a constant diameter duct where it mixed with a lower velocity concentric air stream (secondary). Experimental measurements of the static pressure distribution, mean velocity profiles and turbulence quantities were taken from the initial location where there was a step change in the primary and secondary velocity profiles to the downstream location where the flow was fully developed. Calculations of the momentum flux and wall shear stress were made using the mean velocity and pressure measurements. (Author).
Book Synopsis A Numerical Study of Confined Turbulent Jets by : J. Zhu
Download or read book A Numerical Study of Confined Turbulent Jets written by J. Zhu and published by . This book was released on 1993 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical investigation is reported of turbulent incompressible jets confined in two ducts, one cylindrical and the other conical with a 5 degree divergence. In each case, three Craya-Curtet numbers are considered which correspond, respectively, to flow situations with no moderate and strong recirculation. Turbulence closure is achieved by using the k-epsilon model and a recently proposed realizable Reynolds stress algebraic equation model that relates the Reynolds stresses explicitly to the quadratic terms of the mean velocity gradients and ensures the positiveness of each component of the turbulent kinetic energy. Calculations are carried out with a finite-volume procedure using boundary-fitted curvilinear coordinates. A second-order accurate, bounded convection scheme and sufficiently fine grids are used to prevent the solutions from being contaminated by numerical diffusion. The calculated results are compared extensively with the available experimental data. It is shown that the numerical methods presented are capable of capturing the essential flow features observed in the experiments and that the realizable Reynolds stress algebraic equation model performs much better than the k-epsilon model for this class of flows of great practical importance.
Book Synopsis Unified Analysis of Turbulent Jet Mixing by : Joseph A. Schetz
Download or read book Unified Analysis of Turbulent Jet Mixing written by Joseph A. Schetz and published by . This book was released on 1969 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a unified model for the eddy viscosity in jet mixing flows. The successful boundary layer model due to Clauser is given a new interpretation that permits generalization to a wide variety of turbulent flows.
Book Synopsis Turbulent Mixing of a Confined Axisymmetric Jet by : John A. Brighton
Download or read book Turbulent Mixing of a Confined Axisymmetric Jet written by John A. Brighton and published by . This book was released on 1969 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of the Turbulent Axisymmetric Jet Mixing Layer by : Muhammed S. S. Khwaja
Download or read book Investigation of the Turbulent Axisymmetric Jet Mixing Layer written by Muhammed S. S. Khwaja and published by . This book was released on 1981 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of Confined, Multiple, Turbulent Jet Mixing with Recirculation by : Ashoke Ghosh
Download or read book An Experimental Investigation of Confined, Multiple, Turbulent Jet Mixing with Recirculation written by Ashoke Ghosh and published by . This book was released on 1984 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Mixing of a Confined Axisymmetric Jet by : Elias Razinsky
Download or read book Turbulent Mixing of a Confined Axisymmetric Jet written by Elias Razinsky and published by . This book was released on 1969 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Mixing of Axisymmetric Compressible Jets by : Randall C. Maydew
Download or read book Turbulent Mixing of Axisymmetric Compressible Jets written by Randall C. Maydew and published by . This book was released on 1963 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Velocity profiles at five axial stations in the half-jet mixing region of Mach 0.7, 0.85, 0.95, 1.49, and 1.96 free jets were measured. The nondimensional velocity distributions are similar, and correlate with the theory of Crane for incompressible flow. The half-jet spreading rate is essentially constsnt at subsonic speeds and decreases at supersonic speeds. The variation of jet spreading parameter with Mach number was determined from correlation of these and other data.
Book Synopsis The Dynamics of an Axisymmetric Turbulent Jet and of a Passive Scalar Patch in Ambient Turbulence Interpreted from the Passive Scalar Field Statistics by : Rana Sahebjam
Download or read book The Dynamics of an Axisymmetric Turbulent Jet and of a Passive Scalar Patch in Ambient Turbulence Interpreted from the Passive Scalar Field Statistics written by Rana Sahebjam and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The passive scalar field of an axisymmetric turbulent jet and an isokinetic jet in an approximately homogeneous isotropic turbulence (HIT) with negligible mean flow is studied experimentally. The present research builds on that of Khorsandi et al. 2013 and Perez-Alvarado 2016, who studied the velocity field and the passive scalar field of an axisymmetric turbulent jet in a turbulent ambient, respectively. The primary objective is to deduce the jet structure, and to study the jet mixing in the HIT ambient by following the meandering path of the jet, i.e. conditional on the jet centroid. The secondary objective, complementing the first, is to study the diffusion of a momentumless patch of a passive scalar in the HIT ambient.The effect of a turbulent ambient on the dynamics and mixing of the passive scalar field of an axisymmetric turbulent jet is investigated. The experiments were conducted either in a quiescent or a turbulent ambient. The turbulent ambient was generated by a random jet array to achieve an approximately zero-mean-flow HIT ambient in the measurement plane. Two jet Reynolds numbers of Re = 5800 and 10600 were studied. Planar laser-induced fluorescence was used to measure the concentrations of the passive scalar dye (Sc = 2000) at orthogonal cross-sections of the jet at axial distances of x/d = 20, 30, 40, 50, 60. The statistics of the passive scalar field were conditioned on the jet centroid and were compared to the Eulerian statistics and to those of the jet in a quiescent ambient. The use of the centroidal analysis allowed the structure of the jet in the HIT ambient to be deduced, for which a two-region model was proposed. In the first region, following the developing region of the jet, the ambient turbulence progressively disrupts the jet structure and results in a faster concentration decay compared to the quiescent ambient. At a critical downstream distance, where the relative turbulence intensity between the ambient and the jet (ξ = urms,HIT/ urms,jet ) exceeds 0.5, the HIT ambient has destroyed the jet structure and the second region starts. In the second region, the turbulent diffusion is the only mechanism to transport the passive scalar field. The first-order centroidal statistics of the scalar field show self-similarity and self-preservation before jet break-up. The width of the jet is larger in the HIT ambient compared to that in a quiescent ambient and grows with axial distance but remains unchanged beyond jet break-up. Using the present passive scalar data and the velocity data from Khorsandi et al. 2013, it is argued that the momentum-driven entrainment of the jet in the HIT ambient is reduced compared to that in a quiescent ambient, and that the entrainment ceases beyond the jet break-up. The entrainment of the smaller scales of the ambient turbulence leads to a wider range of centerline concentrations and rms concentrations within the jet, and they are hypothesized to increase local concentration gradients and reduce the jet mixing.Diffusion of a patch of a passive scalar in the HIT ambient is studied. A high-Sc number passive scalar dye (Sc = 2500) is released isokinetically from a large diameter jet (d = 29.97 mm), and an orthogonal view of the passive scalar field is obtained using planar laser-induced fluorescence. The temporal evolution of the scalar patch is due to molecular diffusion and to turbulent diffusion in a quiescent ambient and in the HIT ambient, respectively. Time-averaged statistics of the passive scalar field are assessed at t = 0.2, 1, 1.8, 2.6, 3.4 s using a centroidal analysis. The mean concentration decays quickly and the rms concentration increases within the scalar patch. Compared to the quiescent ambient case, a wider range of the concentrations is present at the centroid of the scalar field. The size of the scalar patch increases with time, which is attributed to an increasing turbulent diffusivity for times shorter than the integral time scale of the turbulence"--
