Simulation-driven design of low-speed wind tunnel contraction

Leifsson, Leifur; Koziel, Slawomir

doi:10.1016/j.jocs.2014.12.004

Cited by 13 publications

(4 citation statements)

References 24 publications

(28 reference statements)

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“…Para garantir que os resultados encontrados nos cálculos numéricos realizados pelo software sejam realistas, foram realizados testes comparativos com os resultados experimentais do túnel de vento mencionado por LEIFSSON et. al.…”

Section: -Validação Experimentalunclassified

Avaliação da Curvatura do Bocal de um Túnel de Vento Subsônico e Aberto, Utilizando Simulação Numérica

Araripe

Matos

2016

cnx

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Resumo. O presente trabalho tem como objetivo avaliar numericamente um túnel de vento aberto e subsônico, a ser usado na calibração de anemômetros de copos, que são amplamente utilizados na indústria de parques eólicos. Através da solução numérica das equações de Navier-Stokes para o escoamento que ocorre no interior do túnel, esse estudo preliminar trata da definição da curva de contração a ser utilizada na concepção do bocal de entrada. Tal curvatura influencia diretamente na qualidade do fluxo que segue para a seção de testes, além de interferir no comprimento necessário para se atingir as velocidades demandadas na calibração de anemômetros. Através parâmetros pré-estabelecidos, foram comparadas 5 curvas de Bezier, onde os efeitos sob o deslocamento do ar direcionado à seção de testes foram avaliados. Como resultado, foi possível verificar a influência causada pela curva de contração perante as diferentes condições geométricas apresentadas.

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Section: -Validação Experimentalunclassified

Avaliação da Curvatura do Bocal de um Túnel de Vento Subsônico e Aberto, Utilizando Simulação Numérica

Araripe

Matos

2016

cnx

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“…Calautit et al [29] adopted numerical investigations into the design and simulation of the flow parameters in a closed-loop subsonic wind tunnel, which demonstrated that adding the guide vanes to the wind tunnel upstream corners improved the airflow uniformity by 36% and combining the upstream with downstream guide vanes improved the uniformity by 65%. Leifsson et al [30] used a high-fidelity CFD flow solver to capture the nonlinear flow field. Due to the high computational expense of the CFD simulation, surrogate-based optimization (SBO) was used to accelerate the design process and obtained better performance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Portable Wind Tunnel for Energy Harvesting

Tian

Hao

Liu³

et al. 2021

Aerospace

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Current wind tunnels possess a large space volume and high manufacturing cost, which are not suitable for investigating micro energy harvesters. This paper aims to design and fabricate a small, portable and low-speed wind tunnel for energy harvesting. A wind tunnel structure was first designed, a finite element analyses is then utilized to obtain the airflow velocity and turbulence intensity at the testing section, and the influence of the structural parameters of the wind tunnel on the flow field performance is finally investigated to achieve better performance. An experimental prototype of the wind tunnel was fabricated to verify the simulation results. Results demonstrated that the distribution uniformity and average turbulence intensity at the test section decrease first and then increase with the increase of both the diffuser and contraction lengths. The rectifying and damping effect of the honeycomb increase with increasing porosity and thickness. When the diffuser and contraction lengths are 850 mm and 480 mm, respectively, a better distribution uniformity and a lower turbulence intensity can be achieved. Experimental results were in good agreement with the simulation values. The maximum airflow velocity can reach up to 24.74 m/s, and the minimum error was only 1.23%. The designed wind tunnel achieved low-speed, small, portable and stable functions. This work provides an important guidance for further investigating the piezoelectric energy harvesting.

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“…The function of the contraction section is to uniformly accelerate the fluid from the rectification section, to ensure that the fluid characteristics in the test section meet the requirements of stability and uniformity [4][5][6]. The structure of the contraction section is mainly determined by the contraction curve.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Flow Field Performance of a Small Circulating Water Channel Based on Porous Grid Plate

2020

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Low-cost and high-efficiency circulating water channels are widely used in the hydrodynamic tests of an underwater device. The current research mainly focuses on obtaining a better velocity uniformity of the test section by optimizing the curve function of the boundary in the contraction section. While, for small underwater device, their hydrodynamic characteristics are sensitive to turbulence. Thus, the circulating water channel, which can obtain the required turbulence characteristics, is urgently needed. A small circulating water channel, which can reduce the turbulence intensity based on a porous grid plate and can be used to test the hydrodynamic characteristics of a small underwater device, is designed. The relationships between porosities and resistance coefficients of a porous grid plate are established. The effects of the honeycomb (porosity and thickness); screen (porosity, number of layers, and spacing); and pumping flow rate on the turbulent characteristics of the test section are studied. The relationships between the parameters and the turbulent characteristics of the test section are established, and the methods to achieve the required flow characteristics of the test section are proposed. Experiments are carried out, and the validity of the obtained results is verified. In this work, the turbulence intensity of the fluid field in the test section can be restrained to 0.0491, which is enough to meet the turbulence requirements for the hydrodynamic test of a small underwater device. This work can provide references for the construction of a hydrodynamic test platform for small underwater devices.

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Simulation-driven design of low-speed wind tunnel contraction

Cited by 13 publications

References 24 publications

Avaliação da Curvatura do Bocal de um Túnel de Vento Subsônico e Aberto, Utilizando Simulação Numérica

Avaliação da Curvatura do Bocal de um Túnel de Vento Subsônico e Aberto, Utilizando Simulação Numérica

Investigation of a Portable Wind Tunnel for Energy Harvesting

Enhancing Flow Field Performance of a Small Circulating Water Channel Based on Porous Grid Plate

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