Author: Donald Boyd OwingsPublisher:
ISBN:
Category :
Languages : en
Pages : 142
Book Description
I.Turbulent Intensities and Shear Stress in the Two Dimensional Wall Jet
Author: Donald Boyd Owingsการเขียนเอกสารอ้างอิงระบบ APA
Author: Advances In Turbulence
Author: Stanley CorrsinPublisher: CRC Press
ISBN: 9780891167471
Category : Technology & Engineering
Languages : en
Pages : 256
Book Description
Based on a symposium held in June 1986 in Minneapolis, USA, this volume surveys current information on turbulence measurement and modelling, computational fluid mechanics, vortex flow and physical modelling, cavitation and two-phase flow, bluff body flow and fluid structure interaction.
The Streamwise Development of Two-dimensional Wall Jets and Other Two-dimensional Turbulent Shear Flows
Author: Ian S. GartshorePublisher:
ISBN:
Category : Shear flow
Languages : en
Pages : 420
Book Description
The Structure of Turbulent Shear Flow
Author: Albert Alan TownsendPublisher:
ISBN:
Category : Science
Languages : en
Pages : 338
Book Description
Turbulence Measurements and Flow Modeling
Author: Ching Jen ChenPublisher: CRC Press
ISBN: 9780891165583
Category : Science
Languages : en
Pages : 884
Book Description
Laser Doppler Measurements of Turbulence in a Two-dimensional Wall Jet on a Flat Plate in Stagnant Surroundings
Author: Mark Edward SchneiderPublisher:
ISBN:
Category :
Languages : en
Pages : 708
Book Description
Investigation of Blown Boundary Layers with an Improved Wall Jet System
Author: K. R. SaripalliPublisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 324
Book Description
The Theory of Turbulent Jets
Author: Genrikh Naumovich AbramovichPublisher: Mit Press
ISBN: 9780262010085
Category : Technology & Engineering
Languages : en
Pages : 671
Book Description
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.
Wall-jet Turbulence and Mixing Control by Way of a Pulsed Inlet Velocity
Author: Cristale D. Garnica VallejoPublisher:
ISBN:
Category : Aerospace engineering
Languages : en
Pages : 236
Book Description
"Understanding wall-jet-induced turbulence and mixing is an important challenge in modern engineering, as drag reduction and mixing enhancement are attainable by modifying the flow development. Simulations are performed to investigate the effect on skin friction and flow mixing due to introducing controlled perturbations, at the initial shear layer of a planar wall-jet using jet inlet cyclic pulsing. The billow production by the Kelvin-Helmholtz instability, the instability that drives turbulence in a wall-jet, is modified by the excitation of the inlet velocity profile by a sine wave perturbation. Two types of wall-jet simulations are carried out, a two-dimensional compressible case at Rein = 5000 using the PyFR solver and a three-dimensional incompressible case at Rein = 6000 using the Nek5000 solver. The compressible wall-jet simulation indicates that the addition of a sine wave perturbation of 1% on the inlet velocity, at the initial shear layer, increases the wall-normal turbulence intensity at a Strouhal number (Sr) of 0.05 and reduces the turbulence intensity in all directions at a Sr of 0.25. The incompressible wall-jet simulations show that a perturbation of magnitude 40% of the inlet velocity at a low Sr number of 0.0048 damps turbulence and leads to skin friction reduction. The forced wall-jet experiences a repetitive re-laminarization process that delays transition as well as separation from the wall. A qualitative parametric analysis of the perturbation of the global behavior of the flow development on a plane wall-jet under forced velocity profiles is also presented. Cases at Sr = 0.0048 experience a reduction in the number of turbulent structures while becoming more stable, indicating potential drag reduction. Cases at Sr = 0.02 experience a frequent energy re-supply from the inlet that helps maintain large turbulent structures at further downstream locations, useful for mixing related applications."--Abstract.