An Experimental Study of the High Reynolds Number Turbulent Boundary Layer PDF Download
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Author: Gary Joseph Kunkel
Publisher:
ISBN:
Category :
Languages : en
Pages : 476
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Author: Gary Joseph Kunkel
Publisher:
ISBN:
Category :
Languages : en
Pages : 476
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Author: Gazi Hasanuzzaman
Publisher: Cuvillier Verlag
ISBN: 3736965583
Category : Technology & Engineering
Languages : en
Pages : 180
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Book Description
Experimental investigation in turbulent boundary layer flows represents one of the canonical geometries of wall bounded shear flows. Utmost relevance of such experiments, however, is applied in the engineering applications in aerospace and marine industries. In particular, continuous effort is being imparted to explore the underlying physics of the flow in order to develop models for numerical tools and to achieve flow control. Flow control experiments have been widely investigated since 1930’s. Several flow control technique has been explored and have shown potential benefit. But the choice of control technique depends largely on the boundary condition and the type of application. Hence, friction drag of subsonic transport aircraft is intended to be reduced within the scope of this Ph. D. topic. Therefore, application of active control method such as microblowing effect in the incompressible, zero pressure gradient turbulent boundary layer was investigated. A series of experiments have been performed in two different wind tunnel facilities. Wind tunnel from Department of Aerodynamics and Fluid Mechanics (LAS) was used for the measurements for moderate Reynolds number range in co-operation with the wind tunnel from Laboratoire de M´ecanique de Feiret Lille for large Reynolds number range. Measurements are conducted with the help of state-of-the-art techniques such as Laser Doppler Anemometry, Particle Image Velocimetry and electronic pressure sensors.
Author: Gary S. Settles
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 222
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Author: Richard D. Samuels
Publisher:
ISBN:
Category : Skim friction (Aerodynamics)
Languages : en
Pages : 82
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Author: M. Olomen
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
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Experimental data obtained in a two-dimensional turbulent boundary layer (TBL) flow and a three-dimensional (3D) pressure-driven TBL flow around a wing/body junction are presented. Reynolds number effects are investigated. Fine spatial resolution laser-Doppler velocimeter measurements of mean velocity and higher order statistics including the third order products measured for 9 stations are reported. Reynolds number based on momentum thickness (Re sub theta) of the developing 2-D boundary layer on the wall was Re sub theta = 232OO, and the approach nominal reference velocity of the undisturbed air flow was 32 m/sec. The wing shape used had a 3:2 elliptical nose, NACA 0020 profiled tail and it was mounted on a flat wall. Distribution of measured static pressure variation on the wall, turbulent kinetic energy and some derived quantities such as the flow angle, flow gradient angle, shear stress angle, and modeling parameters are also discussed.
Author: Stanford University. Thermosciences Division
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 226
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Author: Giles John Brereton
Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 304
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An experimental study of the effects of forced, free-stream unsteadiness on turbulent boundary layers was undertaken in an effort to characterize the nature of such flows and to provide guidance for turbulence modelers. A turbulent boundary layer, which had developed under steady, constant-pressure conditions, was locally subjected to a range of frequencies of sinusoidal free-stream unsteadiness. The response of the boundary layer to these free-stream effects was studied through simultaneous measurements of the u and v components of the velocity field, using a two-color laser-doppler anemometer. To focus on the distinct behaviors of the deterministic and time-averaged fields of flow, the equations of fluid motion were reformulated according to a triple decomposition of velocity and pressure into; (i) a time-averaged measure, (ii) a deterministic or organized, unsteady measure, and (iii) a turbulent measure.
Author: David Michael Driver
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 268
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Author: Jack Wayne Backus
Publisher:
ISBN:
Category : Channels (Hydraulic engineering)
Languages : en
Pages : 238
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Author: James G.. Brasseur
Publisher:
ISBN:
Category : Reynolds number
Languages : en
Pages : 30
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