Structure turbulent flow behind a square cylinder with an angle of incidence

Yanovych, Vitalii; Duda, Daniel; Uruba, Václav

doi:10.1016/j.euromechflu.2020.09.003

Cited by 19 publications

(15 citation statements)

References 28 publications

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“…Detailed methodology for estimating turbulent flow parameters is given in the papers [7,51]. The experimental studies were performed at the constant distance x ⋅ c −1 ≈ 0.2 and at the different angle of attack .…”

Section: Length Scales Analysis Of the Turbulent Flowmentioning

confidence: 99%

Anisotropy of turbulent flow behind an asymmetric airfoil

et al. 2021

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Feature of turbulent flow anisotropy behavior behind an asymmetric NACA 64-618 airfoil investigated in this paper. Experimental studies were performed using a hot-wire anemometery with X-probe at the chord-based Reynolds number $$1.7 \times 10^5$$ 1.7 × 10 5 . The average ensemble velocity and Reynolds stress components are used to determine the wake topology and anisotropy of turbulence. The obtained data allowed to identify the outside wake region, which is characterized by low instability and a high degree of anisotropy of the turbulent flow. This tendency is observed at different angles incident. Further, to gain better insight into the physics of this phenomenon the structure of turbulence have been evaluated. Integral turbulence length and time scales were estimated by the area of the autocorrelation function of velocity fluctuations. Then, using the second-order structural function, we obtained the dissipation characteristics of the flow. In addition, the features of the energy spectrum in the region with high and low degrees of turbulence anisotropy were analyzed.

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Section: Length Scales Analysis Of the Turbulent Flowmentioning

confidence: 99%

Anisotropy of turbulent flow behind an asymmetric airfoil

et al. 2021

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“…To estimate the structure of turbulent flow (stream-wise component) depending on positioning of the measuring cross-section and angle of attack, we chose the point M. For this purpose, we used a methodology that is well described in the paper [17]. The authors used correlation time analysis to evaluations the mean temporal and spatial scales of turbulent flows.…”

Section: The Structure Of the Turbulent Flow At The Pointmentioning

confidence: 99%

The structure of turbulent flow behind the NACA 0012 airfoil at high angles of attack and low Reynolds number

et al. 2021

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This paper shows the results of a study of the turbulent structure behind the NACA 0012 airfoil. During the experiment, the flow velocity was 20 m·s−1. That corresponds the Reynolds number 1.3·105. The point behind the trailing edge was chosen for experimental studies. Measurements were performed at six angles of attack α = 0°, 15°, 30°, 45°, 60°, 75° and various cases of positioning the measuring section. Namely at a constant crosssection and a constant distance behind the airfoil. The NetScanner pressure system and hot-wire technique were used for experimental studies. The obtained data allowed us to investigate the wake topology. The average velocity and standard deviation distributions are clearly grouped depending on the angle of attack. Thus, flowing around the airfoil is better up to α ≤15°. Distributions by power density and dissipation spectra also have a similar grouping tendency. Finally, we investigated the turbulent structure according to the research program. We found that at α ≥45°, depending on the measurement case, there is a clear difference in the distribution of standard deviation, Eulerian length scale, Taylor micro-scale, and Reynolds number based on the Taylor micro-scale. The obtained values at the constant distance, in contrast to the constant cross-section, are reduced.

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“…An open-type wind tunnel was developed in the laboratory of power machines of the University of Western Bohemia (Fig. 1) [20][21][22]. This wind tunnel can generate a flow velocity V of up to 90 m•s -1 .…”

Section: The Wind Tunnelmentioning

confidence: 99%

Structural Deformation of a Running Wind Tunnel Measured By Optical Scanning

Yanovych

Duda

2020

Strojnícky Časopis - Journal of Mechanical Engineering

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Nowadays, the development of wind tunnels for the study of various aerodynamic phenomena is actively developing. It is possible to generate a highly laminar flow only under the condition of structural stability of the construction parts of the wind tunnel under the action of sharp pressure drops. The aim of this research is to investigate the deformation and displacement of the structural parts of the developed wind tunnel capacity of 55 kW depending on the velocity of the generated airflow. To estimate the amount of deformation and mutual displacement of the structural elements of the wind tunnel depending on the airflow velocity, we used the ARAMIS optical system.

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Structure turbulent flow behind a square cylinder with an angle of incidence

Cited by 19 publications

References 28 publications

Anisotropy of turbulent flow behind an asymmetric airfoil

Anisotropy of turbulent flow behind an asymmetric airfoil

The structure of turbulent flow behind the NACA 0012 airfoil at high angles of attack and low Reynolds number

Structural Deformation of a Running Wind Tunnel Measured By Optical Scanning

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