Experimental Study on Turbulent Boundary-layer Flows with Wall Transpiration PDF Download
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Author: Marco Ferro
Publisher:
ISBN: 9789177295563
Category :
Languages : en
Pages : 140
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Book Description
Author: Marco Ferro
Publisher:
ISBN: 9789177295563
Category :
Languages : en
Pages : 140
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Book Description
Author: C. K. Liu
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 171
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Book Description
Experimental data are presented on flow structure, mean, and fluctuating velocities in turbulent boundary layers over a family of flat surfaces with transverse roughness elements made of square bars of variable spacing. All flows were incompressible and had zero streamwise pressure gradient. The flow structures are described for surfaces extending from hydraulically smooth to fully rough. A distinct flow pattern is observed in the wall region for each of four cases: smooth, skimming, wake-interference and isolated-roughness flow. Maximum roughness was observed with a ratio of gap to bar width of approximately 11. The most obvious effect of an increase in surface roughness is the distinct increase of turbulence production and the concomittant increase in the value of eddy viscosity. It is shown that this increase in eddy viscosity increases the total thickness of the layer in the same way that an increase in molecular viscosity would do in a laminar layer. The normalization of eddy viscosity for the outer portion of the layer as suggested by Clauser is found to apply to the rough surfaces studied. (Author).
Author: David Michael Driver
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 268
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Book Description
Author: Peter Sten Andersen
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 230
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Book Description
Author: Heung-tae Kim
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 188
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Book Description
The structure of the turbulent boundary layer on a smooth wall with zero pressure gradient has been studied experimentally. Emphasis has been given to the production of turbulence in the inner layers. Intensive studies of a few.
Author: Guy Graham Wooten
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Book Description
Author: Howard L. Julien
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 412
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Book Description
Author: Robert Jackson Loyd
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 196
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Book Description
Author: Weijie Shao
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Gazi Hasanuzzaman
Publisher: Cuvillier
ISBN: 9783736975583
Category :
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.
