Air flow formation in the inlet of a closed circuit boundary layer wind tunnel using the one-set guide vanes solution

On the basis of boundary layer with the airfoil profile, this research attempts to investigate the effect of the angle of spread of the winged air suction equipment on the efficiency of operation. The application of Fluent with the split-middle method under the identical operation mode is expected to optimize the spread angle. The investigated airfoil profile is NACA6413, of which the restrictions on the critical angle of spread suggested in literature will be overcome through the interactions between the internal and external flow fields. As a result, the air speed might increase. The wind tunnel test employed in this research offers the solid evidences to support this hypothesis. The test demonstrates that when the angle of spread is larger than 12?, the effect of accelerating the air flow is still observable. Following the optimization, the air suction effect of the equipment would be optimal when its angle of spread reached 30?.

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WIND PRESSURE DISTRIBUTION ON NORTH-LIGHT INDUSTRIAL BUILDING ROOF STUDY

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2017.72 ◽

2017 ◽

Vol 4 (1) ◽

Author(s):

Astha Verma ◽

Ashok Kumar Ahuja

Keyword(s):

Boundary Layer ◽

Experimental Study ◽

Wind Tunnel ◽

Pressure Distribution ◽

Wind Pressure ◽

Closed Circuit ◽

Industrial Building ◽

Building Roof ◽

Pressure Coefficients ◽

Wind Pressures

Present paper describes details of the experimental study carried out on the models of industrial building with north-light roof in order to generate the information about wind pressure distribution on it. The models are tested in a closed circuit boundary layer wind tunnel to measure values of wind pressures on roof surface. Four cases namely one, two, three and four spans are considered. The side of Perspex sheet model in case of multi-span study places plywood models. Wind is made to hit the models at 13 wind incidence angles from 0° to 180° at an interval of 15°. Values of mean wind pressure coefficients are evaluated from the measured values of wind pressures and contours are plotted.

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Determination of the Diameter of a Cylinder to Insertion in a Low-Speed Wind Tunnel Based on EFD and CFD

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.798.165 ◽

2015 ◽

Vol 798 ◽

pp. 165-169

Author(s):

Guilherme L.F. de Vasconcellos ◽

Matheus D. de Queiroz ◽

Luiz F.R. Ledo ◽

Sérgio de M. Hanriot ◽

Cristiana Brasil Maia

Keyword(s):

Fluid Dynamics ◽

Boundary Layer ◽

Wind Tunnel ◽

Test Section ◽

Experimental Tests ◽

Experimental Fluid Dynamics ◽

Minimum Diameter ◽

Ansys Cfx ◽

The One ◽

Different Diameters

The objective of this study was to determine the ideal diameter of a circular cylinder for insertion into the test section of a small wind tunnel, so that there was no flow blockage and influence of the developing wind tunnel boundary layer in the flow around the cylinder. The approaches used were the experimental fluid dynamics (EFD) by the use of Pitot tube and hot wire anemometer (HWA) and the computational fluid dynamics (CFD) simulations, performed with ANSYS CFX software. For this, it was first determined the boundary layer thickness along the test section without the cylinder, through computer simulations. Based on this information, several simulations were performed with cylinders of different diameters to quantify their influence on the rotational flow. From the four studied cylinder diameters, it was found that only the one with 30 mm did not cause bending of the streamlines at the intersection with the boundary layer developing in the tunnel. Moreover, this was the minimum diameter of the cylinder so that the tests with Pitot probe could be used without disturbances caused by its dimensions in the flow to be characterized. After analyzing these results, the cylinder of 30 mm was built and the experimental tests were performed, validating the numerical results.

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Aerodynamic Analysis on Proton Preve by Experimental

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.773-774.575 ◽

2015 ◽

Vol 773-774 ◽

pp. 575-579

Author(s):

Mohamad Nor Musa ◽

Samion Syahrullail ◽

Fairuz Zainal Abidin

Keyword(s):

Boundary Layer ◽

Reynolds Number ◽

Wind Tunnel ◽

Shape Optimization ◽

Air Flow ◽

Literature Reviews ◽

Air Speed ◽

Vehicle Shape ◽

Low Speed Wind Tunnel ◽

The Relationship

The purpose of this study is to determine the coefficient drag, CD of the Proton PREVẾ by experimental method using Low Speed Wind Tunnel. All the relevant data are collected through the literature reviews from books and journals. First, the basic thing in aerodynamic is studied. There are two things are concern when studies aerodynamics. They were air flow and vehicle shape which we regard as aerodynamics factor that determine aerodynamic of the vehicle. Fundamental of air flow and vehicle shape is reviewed includes the relationship between air speed with pressure, boundary layer, Reynolds number, drag, lift drag and shape optimization. Wind tunnel is also studied before the experiment. Five selected speed were been tasted during the experiment to determine the CD value.

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3D Experimental and Numerical Analysis of Natural Ventilation of Domed-Roof Buildings During Economizer Mode

ASME 2012 6th International Conference on Energy Sustainability, Parts A and B ◽

10.1115/es2012-91200 ◽

2012 ◽

Author(s):

A. Rahmatmand ◽

M. Yaghoubi ◽

E. Goshtasbi Rad

Keyword(s):

Boundary Layer ◽

Wind Tunnel ◽

Atmospheric Boundary Layer ◽

Natural Ventilation ◽

Air Flow ◽

Open Loop ◽

Scale Model ◽

Turbulent Air Flow ◽

Reduced Scale ◽

Made In

This paper present experimental measurements of velocity distribution at different sections around a reduced scale model of a real domed-roof building with several openings. Measurements are made in an open loop wind tunnel with atmospheric boundary layer. A new modified Counihan scheme which is a combination of the two systems is developed for the purpose of part-depth atmospheric boundary layer (ABL). The measured quantities are wind velocity profile, turbulence intensity, and air flow pattern around the building. For experiments a 1:54 scale model of a domed-roof building with six windows and an aperture on the roof is made. In addition, by using a numerical solution, turbulent air flow around such scale model in the wind tunnel is simulated and flow field inside the model and also the discharge coefficient are computed during the economizer mode.

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