Design Methodology for a Quick and Low-Cost Wind Tunnel

Hernández, Miguel Ángel González; López, Ana I. Moreno; Jarzabek, Artur A.; Perales, José Manuel Perales; Wu, Yu-Liang; Sun, Xiaoli

doi:10.5772/54169

Cited by 22 publications

(34 citation statements)

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“…Thereby, due to the shape of the nozzle geometry, the flow field resembles a plug flow at the contraction exit with a very low turbulence level. A detailed design description of the nozzle geometry and estimations of the pressure drop and flow turbulence can be found in [37].…”

Section: Methodsmentioning

confidence: 99%

Database of Near-Wall Turbulent Flow Properties of a Jet Impinging on a Solid Surface under Different Inclination Angles

Ries

Rißmann

et al. 2018

Fluids

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Abstract:In the present paper, direct numerical simulation (DNS) and particle image velocimetry (PIV) have been applied complementarily in order to generate a database of near-wall turbulence properties of a highly turbulent jet impinging on a solid surface under different inclination angles. Thereby, the main focus is placed on an impingement angle of 45 • , since it represents a good generic benchmark test case for a wide range of technical fluid flow applications. This specific configuration features very complex flow properties including the presence of a stagnation point, development of the shear boundary layer and strong streamline curvature. In particular, this database includes near-wall turbulence statistics along with mean and rms velocities, budget terms in the turbulent kinetic energy equation, anisotropy invariant maps, turbulent length/time scales and near-wall shear stresses. These properties are useful for the validation of near-wall modeling approaches in the context of Reynolds-averaged Navier-Stokes (RANS) and large-eddy simulations (LES). From this study, in which further impingement angles (0 • , 90 • ) have been considered in the experiments only, it turns out that (1) the production of turbulent kinetic energy appears negative at the stagnation point for an impingement angle other than 0 • and is balanced predominantly by pressure-related diffusion, (2) quasi-coherent thin streaks with large characteristic time scales appear at the stagnation region, while the organization of the flow is predominantly toroidal further downstream, and (3) near-wall shear stresses are low at the stagnation region and intense in regions where the direction of the flow changes suddenly.

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Section: Methodsmentioning

confidence: 99%

Database of Near-Wall Turbulent Flow Properties of a Jet Impinging on a Solid Surface under Different Inclination Angles

Ries

Rißmann

et al. 2018

Fluids

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show abstract

“…Subsequently, due to the budding attention of other branches of industry and science in low speed aerodynamics, and due to the persistent incapability of achieving accurate solutions with numerical codes, even with advancements, low speed wind tunnels (LSWT) are essential and irreplaceable during research and design. [18] Many times, when testing new designs and materials, FEA software fails to create the interactions and properties that are unknown, and wind tunnels step in to help produce accurate flow modelling results.…”

Section: Aeroacoustic Wind Tunnelsmentioning

confidence: 99%

“…Aerodynamic testing has now grown into other areas such as the car industry, engineering, the atmosphere, education, and so on, making low-speed wind tunnel experiments increasingly important. [18]…”

Section: E) Importancementioning

confidence: 99%

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Modeling and Wind Flow Analysis of an Eiffel (Open) Type Sub-Sonic Wind Tunnel

Namirian¹,

Mathure²,

Thorat³

et al. 2021

GJRE

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Wind tunnel (WT) is a device that artificially produces airflow relative to a stationary body and measures aerodynamic force and pressure distribution, simulating the actual conditions with an important aspect of accurately feigning¬ the full complexity of fluid flow. The aim of the present study is to design the three dimensional geometry of a small, open-circuit (also known as Eiffel Type), and subsonic (low speed) wind tunnel (WT) capable of demonstrating or acting as a vital tool in aero-mechanics research. The project and fabrication itself, poses as an onerous task with the cynosure/central theme being the delineation/depiction of wind tunnel components such as Test Section, contraction cone, diffuser, drive system and settling chamber.

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“…Wind tunnels are one of the essential tools for aerodynamic studies. It has a very diverse application in many engineering fields [1]. Designing a wind tunnel is somewhere between an art and science, with occasional excursions into propitiatory works [2].…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of flow in an open-type subsonic wind tunnel

Verma

Baloni

2019

SN Appl. Sci.

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A numerical and experimental investigation of flow, inside the test section of an open-type subsonic wind tunnel, has been incorporated in the present paper. Experimental data are collected at different selected locations along the wind tunnel length and inside the test section. For detail assessment of the spatial variation of flow variables, numerical analysis is carried out. Boundary conditions have a significant influence on the validation of numerical simulation. A novel approach of system curve generation by experimental analysis of wind tunnel is adopted, instead of using the conventional approach of fan-type boundary condition. Mass flow rate and pressure jump obtained by system curve are utilized for inlet and outlet boundary conditions, respectively. Comparison of numerical and experimental flow fields at the test section suggests maximum error of 9.84% in case of area-weighted average wind velocity along the length of the test section, whereas along the height of the test section a maximum error of 7.75% is observed. Keywords Wind tunnel testing • Numerical simulation • Boundary conditions • Honeycomb and screens • System curve • Flow assessment List of symbols L Length of the honeycomb cell d h Hydraulic diameter of the honeycomb cell CFD Computational fluid dynamics VFD Variable frequency drive

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Design Methodology for a Quick and Low-Cost Wind Tunnel

Cited by 22 publications

References 0 publications

Database of Near-Wall Turbulent Flow Properties of a Jet Impinging on a Solid Surface under Different Inclination Angles

Database of Near-Wall Turbulent Flow Properties of a Jet Impinging on a Solid Surface under Different Inclination Angles

Modeling and Wind Flow Analysis of an Eiffel (Open) Type Sub-Sonic Wind Tunnel

Numerical and experimental investigation of flow in an open-type subsonic wind tunnel

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