Exploring the Effectiveness of Visualization Techniques for NACA Symmetric Airfoils at Extremely Low Reynolds Numbers

This article aims to highlight the importance of utilizing flow visualization techniques in the preliminary analysis of streamlined and bluff bodies, especially the potential use of visualization with ink in a water channel as a tool for a preliminary approach during fluid mechanics analysis. Accord...

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Bibliographic Details
Published in:Fluids (Basel) 2023-07, Vol.8 (7), p.207
Main Authors: Rodríguez-Sevillano, Ángel Antonio, Casati-Calzada, María Jesús, Bardera-Mora, Rafael, Ballesteros-Grande, Lucía, Martínez-García-Rodrigo, Lucía, López-Cuervo-Alcaraz, Alejandra, Fernández-Antón, Jaime, Matías-García, Juan Carlos, Barroso-Barderas, Estela
Format: Article
Language:English
Subjects:
Aerodynamics
Aerofoils
Bluff bodies
Engineering research
Evaluation
Extreme values
extremely low Reynolds numbers
Flow velocity
Flow visualization
Fluid flow
Fluid mechanics
Laser applications
Low speed wind tunnels
Measurement techniques
Mechanical properties
Methods
NACA airfoils
PIV
Reynolds number
Streamlined bodies
towing tank
Viscosity
Visualization
Vortices
Wind tunnels
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Summary:This article aims to highlight the importance of utilizing flow visualization techniques in the preliminary analysis of streamlined and bluff bodies, especially the potential use of visualization with ink in a water channel as a tool for a preliminary approach during fluid mechanics analysis. According to this, the study compares the results obtained using a classical flow visualization technique, ink injection in water, with those obtained through the employment of a laser-based measurement and visualization technique, called PIV, in a low-speed wind tunnel. The article briefly presents both techniques and highlights the importance of flow visualization in the analysis of aerodynamic bodies. This study focuses on flow over NACA airfoils at extremely low Reynolds numbers, which is of great interest for application in extraterrestrial atmospheres, such as on Mars. After obtaining images of the flow streamlines over the NACA 0018 airfoil, the results of both techniques were compared. The results indicated that there was good agreement between the visualization with the water channel and the PIV results, suggesting that the results obtained in the water channel represented a scientifically valid approximation and an essential complement to computational models that require experimental validation.
ISSN:2311-5521
2311-5521
DOI:10.3390/fluids8070207