An Experimental Study of a Plane Turbulent Wall Jet Using Particle Image Velocimetry PDF Download
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Languages : en
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Languages : en
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Author: Zhujun Tang
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Languages : en
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Author: Martin Agelin-Chaab
Publisher:
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Category :
Languages : en
Pages : 368
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Turbulence kinetic energy -- particle image velocimetry -- proper orthogonal decomposition -- two-point velocity correlations -- triple velocity products -- harpin vortex -- turbulenc production.
Author: Thomas D. Weir
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 110
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Author: Jan Eriksson
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Category :
Languages : en
Pages : 196
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Author: Douglas Howard Neale
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Category : Jets
Languages : en
Pages : 534
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An experimental study of various wall jet flows was conducted. The major areas of investigation were: The wall jet injected into still air; The wall jet under a constant-pressure main-stream flow; The wall jet subjected to an adverse pressure gradient imposed by a retarded main-stream flow with a substantially thickened initial boundary layer; The wall jet subjected to an adverse pressure gradient imposed by a retarded main-stream flow with a thickened and distorted initial boundary layer. Detailed velocity profile and local skin friction measurements were made at numerous streamwise distances from the jet slot. For the case in which no main-stream flow was present, the studies were carried out for a wide range of slot Reynolds numbers. For the wall jets with main-stream flow, selected ratios of free-stream velocity to jet velocity at the jet slot were investigated. The growth of characteristic thickness and decay of jet peak velocity is presented for all wall jet studies. Also, velocity and temperature profile similarity is described. Skin friction laws are shown for the constant-pressure wall jets and a single 'law of the wall' valid for all wall jet studies is set forth. Finally, the skin friction and velocity profile measurements are presented in tabular form. (Author).
Author: Han-Lieh Liu
Publisher:
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Category :
Languages : en
Pages : 326
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Author: Mohammad Rahman
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Category :
Languages : en
Pages : 0
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The characteristics of turbulent jets interacting with a free surface were investigated experimentally. The experiments were performed to quantify the effects of offset height and nozzle geometry on the turbulent characteristics at low Reynolds number (Re = 5500). The offset height ratio of a square jet was varied from 1 to 4. For the nozzle geometry effect, four nozzle configurations including circular, square, rectangular with minor axis oriented parallel to the surface-normal direction, and rectangular with its major axis oriented parallel to the surface-normal direction were tested with a fixed offset height ratio of 2. A particle image velocimetry system was used to perform the velocity measurements. Various quantities were investigated, including instantaneous velocities and turbulent statistics up to the fourth order moment. The jet-surface interaction was examined using mean surface velocity, velocity defect, vorticity thickness and surface turbulence intensities. The turbulent structures in the interaction region were investigated using two-point correlations, joint probability density functions and proper orthogonal decomposition (POD). Turbulent statistics along the free surface revealed that the surface was in the state of stretching and contracting due to the alternating velocity gradient. The straining effect became more severe for shallower jet. For a given offset height ratio, the greatest mean strain at the free surface was produced by the jet issuing in the minor plane of the rectangular nozzle. This nozzle configuration also led to enhancements in the peak values of the surface velocity (about 37%) and turbulence intensities (up to 24%) compared to the circular, square and the jet discharged in the major plane of the rectangular nozzle. The two-point correlations and POD results indicated that the spatial coherence of the velocity fluctuations reduced in the upper shear layer than the lower shear layer. Shorter offset height ratio experienced a slower fractional energy convergence due to a reduction in the structure size under confinement. The re-orientation of the rectangular nozzle to major axis increased the spatial coherence in the interaction region, which led to an about 21% higher fractional energy contribution of the most dominant POD mode (the first mode) compared to the other configurations.
Author: Wolfgang Rodi
Publisher: Elsevier
ISBN: 0080530958
Category : Science
Languages : en
Pages : 1011
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Proceedings of the world renowned ERCOFTAC (International Symposium on Engineering Turbulence Modelling and Measurements). The proceedings include papers dealing with the following areas of turbulence: · Eddy-viscosity and second-order RANS models · Direct and large-eddy simulations and deductions for conventional modelling · Measurement and visualization techniques, experimental studies · Turbulence control · Transition and effects of curvature, rotation and buoyancy on turbulence · Aero-acoustics · Heat and mass transfer and chemically reacting flows · Compressible flows, shock phenomena · Two-phase flows · Applications in aerospace engineering, turbomachinery and reciprocating engines, industrial aerodynamics and wind engineering, and selected chemical engineering problems Turbulence remains one of the key issues in tackling engineering flow problems. These problems are solved more and more by CFD analysis, the reliability of which depends strongly on the performance of the turbulence models employed. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulent momentum, heat and mass transfer. For the understanding of turbulence phenomena, experiments are indispensable, but they are equally important for providing data for the development and testing of turbulence models and hence for CFD software validation. As in other fields of Science, in the rapidly developing discipline of turbulence, swift progress can be achieved only by keeping up to date with recent advances all over the world and by exchanging ideas with colleagues active in related fields.
Author: Bharathram Ganapathisubramani
Publisher:
ISBN:
Category :
Languages : en
Pages : 350
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