The effect of perforation on aerodynamic characteristics and the vortex flow field around a flat plate

Kalugin, V. T.; Epikhin, Andrey; Chernukha, Polina; Kalugina, M.

doi:10.1088/1757-899x/1191/1/012007

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…Kalugin et al. (2021) explained also that for inclined perforated plates, the structure of the flow in the holes depends on (1) the distance of the hole on the plate from the leading edge, and (2) the angle of attack of the plate. For a low angle of attack, the effective hole area can be significantly reduced due to the difficulty of the flow to deflect from its original direction mostly parallel to the surface of the plate.…”

Section: Local Viscous Effectsmentioning

confidence: 99%

Three-dimensional flow around and through a porous screen

Marchand,

Ramananarivo,

Duprat

et al. 2024

J. Fluid Mech.

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We investigate the three-dimensional (3-D) flow around and through a porous screen for various porosities at high Reynolds number $Re = {O}(10^4)$ . Historically, the study of this problem has been focused on two-dimensional cases and for screens spanning completely or partially a channel. Since many recent problems have involved a porous object in a 3-D free flow, we present a 3-D model initially based on Koo & James (J. Fluid Mech., vol. 60, 1973, pp. 513–538) and Steiros & Hultmark (J. Fluid Mech., vol. 853, 2018 pp. 1–11) for screens of arbitrary shapes. In addition, we include an empirical viscous correction factor accounting for viscous effects in the vicinity of the screen. We characterize experimentally the aerodynamic drag coefficient for a porous square screen composed of fibres, immersed in a laminar air flow with various solidities and different angles of attack. We test various fibre diameters to explore the effect of the space between the pores on the drag force. Using PIV and hot wire probe measurements, we visualize the flow around and through the screen, and in particular measure the proportion of fluid that is deviated around the screen. The predictions from the model for drag coefficient, flow velocities and streamlines are in good agreement with our experimental results. In particular, we show that local viscous effects are important: at the same solidity and with the same air flow, the drag coefficient and the flow deviations strongly depend on the Reynolds number based on the fibre diameter. The model, taking into account 3-D effects and the shape of the porous screen, and including an empirical viscous correction factor that is valid for fibrous screens may have many applications including the prediction of water collection efficiency for fog harvesters.

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Section: Local Viscous Effectsmentioning

confidence: 99%

Three-dimensional flow around and through a porous screen

Marchand,

Ramananarivo,

Duprat

et al. 2024

J. Fluid Mech.

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Features in Aerodynamic Characteristics and Flow Structures Around an Aircraft with Perforated Stabilizing Devices

Lutsenko,

Kalugina,

Nazarova

et al. 2023

2023 Applied Mathematics, Computational Science and Mechanics: Current Problems (AMCSM)

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Aerodynamic characteristics of perforated aircraft flight controls at subsonic flow velocities

Kalugin

Lutsenko

Nazarova

2022

EJSI

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The vortex separation from the aircraft control surfaces often leads to undesirable shaking and pitch of the structure. One way to eliminate this effect is to perforate surfaces. The paper considers the aerodynamic characteristics of the aircraft flight control element in the form of a single elongation perforated flat plate. Experimental studies were carried out in a subsonic wind tunnel of Bauman Moscow State Technical University. The aerodynamic coefficients of plates with different degrees of perforation 0...28.3% were obtained at free stream velocities of 15.. 35 m/s in a wide range of angles of attack from 0 to 90 degrees. The graphs of the aerodynamic coefficients of the plates versus the angle of attack were analyzed. Findings of the research show that the aerodynamic characteristics of perforated plates differ from the corresponding characteristics of solid plates, an increase in the degree of perforation leads to a decrease in the values of aerodynamic coefficients, while a decrease in the free flow velocity causes their increase.

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The effect of perforation on aerodynamic characteristics and the vortex flow field around a flat plate

Cited by 4 publications

References 14 publications

Three-dimensional flow around and through a porous screen

Three-dimensional flow around and through a porous screen

Features in Aerodynamic Characteristics and Flow Structures Around an Aircraft with Perforated Stabilizing Devices

Aerodynamic characteristics of perforated aircraft flight controls at subsonic flow velocities

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