Experimental Investigation Of Coaxial Turbulent Jets
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Experimental Investigation Of Coaxial Turbulent Jets
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Author : Jonathan Alan Bornstein
language : en
Publisher:
Release Date : 1977
Experimental Investigation Of Coaxial Turbulent Jets written by Jonathan Alan Bornstein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Gas dynamics categories.
An Experimental And Numerical Investigation Of Confined Coaxial Turbulent Jets
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Author : Jeyhoon Mamaghani Khodadadi
language : en
Publisher:
Release Date : 1986
An Experimental And Numerical Investigation Of Confined Coaxial Turbulent Jets written by Jeyhoon Mamaghani Khodadadi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Jets categories.
An Experimental Investigation Of The Mixing Of Compressible Air Jets In A Coaxial Configuration
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Author : James M. Eggers
language : en
Publisher:
Release Date : 1969
An Experimental Investigation Of The Mixing Of Compressible Air Jets In A Coaxial Configuration written by James M. Eggers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Airplanes categories.
Turbulent mixing of compressible air in supersonic and subsonic coaxial jet flows.
An Experimental Investigation Of The Turbulent Mixing On Non Homogeneous Coaxial Jets
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Author : Louis J. Alpinieri
language : en
Publisher:
Release Date : 1963
An Experimental Investigation Of The Turbulent Mixing On Non Homogeneous Coaxial Jets written by Louis J. Alpinieri and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with categories.
Experimental results on the turbulent mixing process between carbon dioxide and hydrogen central jets exhausting into a moving concentric stream of air are presented. The diffusion of mass and momentum only are considered, since both streams are at approximately equal temperature. The flow velocities are in the low to high subsonic range. Principal points of investigation are the condition of equal velocity between jets and the condition of equal mass flow per unit area between jets. Radial and axial distributions of concentration and velocity are presented. On the basis of the measurements it is concluded that no tendency towards segregation of the stream exists when either the velocities or the mass flows of the streams are equal. Furthermore, it is demonstrated that the product of local density and eddy kinematic viscosity coefficient can be assumed to be solely dependent upon the axial coordinate. In agreement with previous results it is found that mass diffuses more readily than momentum. Finally, a formulation of the eddy viscosity and eddy diffusivity coefficients that adequately describe the results obtained is derived. (Author).
An Experimental Study Of The Coaxial Turbulent Jet
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Author : Robert George Pindell
language : en
Publisher:
Release Date : 1970
An Experimental Study Of The Coaxial Turbulent Jet written by Robert George Pindell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
Multi Scalar Mixing In Turbulent Coaxial Jets
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Author : Alais Hewes
language : en
Publisher:
Release Date : 2021
Multi Scalar Mixing In Turbulent Coaxial Jets written by Alais Hewes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
"An experimental investigation of multi-scalar mixing in turbulent coaxial jets is presented herein. The first part of this work involves the development of a thermal-anemometry-based probe to simultaneously measure two scalars and velocity in turbulent flows. The work of Hewes (2016) on the simultaneous measurement of velocity and helium concentration is extended, and the necessary and optimal design parameters for thermal-anemometry-based probes capable of making such measurements are refined in the current work. An analysis of measurements from different interference probes reveals that, unlike what has previously been reported in the literature, hot-wires of differing diameters are not required for concurrent velocity and concentration measurements. Furthermore, both theoretical arguments and experiments in flows of varying helium concentration are used to demonstrate that the cold-wire thermometer is effectively insensitive to helium concentration. The temperature field can therefore be measured independently of the velocity or concentration fields. This has important implications for interference probes, since the cold-wire can be used to compensate for temperature effects on these probes, allowing them to be used in non-isothermal flows. Consequently, it is shown that an interference probe can be combined with a cold-wire thermometer to form a novel 3-wire probe to simultaneously measure velocity, helium concentration, and temperature in a turbulent flow. \\ \indentIn the second part of this work, the novel 3-wire probe is used to study the evolution of multiple scalars in turbulent coaxial jets consisting of (i) a center jet containing a mixture of helium and air, (ii) an annular jet containing pure (unheated) air, and (iii) a coflow of (pure) heated air. The flow can be viewed as containing three scalars: $\phi_1$, normalized helium concentration, $\phi_2$, pure, unheated air in the annular jet (which is inferred from measurements of the other two scalars), and $\phi_3$, normalized temperature. Measurements are performed along axis of the jets for three different momentum ratios ($M_2/M_1=0.77$, $M_2/M_1=2.1$, and $M_2/M_1=4.2$). Mean and rms quantities, covariances, velocity-scalar triple moments, probability density functions (PDFs), joint probability density functions (JPDFs), and conditional expectations of the fluctuating velocity are measured. Three distinct regions are identified along the axis of the coaxial jets: (i) the potential core of the center jet, consisting primarily of $\phi_1$, (ii) the inner mixing region, dominated by large fluctuations of anti-correlated $\phi_1$ and $\phi_2$, and (iii) the fully merged region, where the coaxial jets behave similarly to a single jet. In this final region, one can observe that $\phi_1$ and $\phi_3$, and $\phi_2$ and $\phi_3$, become progressively anti-correlated in the downstream direction, whereas $\phi_1$ and $\phi_2$ become progressively more correlated. Increasing the momentum ratio ($M$) initially causes $\phi_1$ and $\phi_2$ to mix more quickly, however, examination of the JPDFs suggest that far downstream, these effects may be reversed. Furthermore, distinct differences are observed between coaxial jets in which $M1$ and those in which $M1$, most likely resulting from the fact that the annular jet is entrained into center jet in the former, whereas the center jet is entrained into annular jet in the latter. Finally, it is worth pointing out that $M$ may have a significant effect on the shapes and distributions of the scalar-scalar JPDFs, even where the correlation coefficients of different cases have converged to similar values. Thus, the need for simultaneous multi-scalar measurements when studying multi-scalar mixing is emphasized"--
Experimental Investigation Of Compressible Turbulent Jets
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Author : Zhexuan Wang
language : en
Publisher:
Release Date : 2003
Experimental Investigation Of Compressible Turbulent Jets written by Zhexuan Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
An Experimental Investigation Of A Single And Multiphase Confined Coaxial Jet
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Author : Robert Gore
language : en
Publisher:
Release Date : 1989
An Experimental Investigation Of A Single And Multiphase Confined Coaxial Jet written by Robert Gore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Jet pumps categories.
An Experimental Investigation Of An Axisymmetiric Jet In A Coflowing Airstream
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Author : George Dominic Catalano
language : en
Publisher:
Release Date : 1975
An Experimental Investigation Of An Axisymmetiric Jet In A Coflowing Airstream written by George Dominic Catalano and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with categories.
Summary Report
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Author : D. E. Chriss
language : en
Publisher:
Release Date : 1972
Summary Report written by D. E. Chriss and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Aerodynamics categories.
Turbulent coaxial air-air mixing and hydrogen-air mixing were studied. The ratio of outer stream to jet veolcity was varied from 0.12 to 1.52 for the air-air mixing systems and from 0.16 to 0.42 for the hydrogen-air systems. Special emphasis was placed on the determination of the turbulent transport properties (especially the eddy viscosity and the Prandtl number) from the mean flow field measurements by use of an integral technique. Radial and axial profiles of velocity, concentration, shear stress, and eddy viscosity are presented, as well as radial profiles of the turbulent Prandtl number and representative static pressure profiles. In addition to the graphical presentation of the data, the mean flow field properties are presented in tabular form. The major conclusions of this investigation are: (1) the experimental technique used produced good quality meanflow field data; (2) the integral technique used for calculating the turbulent transport properties from the mean flow field data gave satisfactory results; (3) for the air-air system, a significant radial variation of the second regime eddy viscosity was observed for most of the tests; (4) the eddy viscosity decreases with increasing radius for the hydrogen-air systems; and (5) approximate average values for the turbulent Prandtl number are: 0.60 for the air-air tests and 0.80 to 0.85 for the hydrogen-air system.