Investigations of Flow Phenomena Over a Flat Plate and NACA0012 Airfoil at High Angles of Attack

Jha, Shailesh Kr; Gautam, Uddipta; Pawar, Pramod; Narayanan, S.; Kumaraswamidhas, L.A.

doi:10.1007/s40997-019-00313-z

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…Such instability can cause excessive deformation and can lead to structural failure [6]. Therefore, the determination of the critical velocity is important for such branches of technology as the construction of structures, hydrofoils, and especially aviation technology [7,8]. For these cases, the structures of the fuselage, the shells of the combustion chambers of rocket engines, and the wings are elastic bodies interacting with the air flow.…”

Section: Introductionmentioning

confidence: 99%

Determination of the critical velocity of a straight wing with a high aspect ratio

Thanh¹

2023

International Journal of Applied Mechanics and Engineering

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An aerodynamic problem on an air flow around a large aspect ratio rectangular wing is investigated in this study. According to the theory of Vlasov, the wing is considered to be a thin rod. External loads are assumed to be proportional to the airfoil angle of attack related to the dimensionless coefficient of the lift and the pitching moment coefficient. These coefficients depend on the airfoil parameters and the Mach number M and are determined by experimental measurements for subsonic and supersonic velocities. In this case, to define the unstable cases of the wing, one bases on the Lyapunov stability theory. Equations of bending and torsional free vibrations have resulted. Based on the analysis of natural frequencies (eigenfrequencies), it is possible to determine the changing positions of the real part and the imaginary part of the characteristic equation solution. These positions can cause instabilities for the wing such as torsional divergence and flutter.

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Section: Introductionmentioning

confidence: 99%

Determination of the critical velocity of a straight wing with a high aspect ratio

Thanh¹

2023

International Journal of Applied Mechanics and Engineering

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“…Ref. [20] conducts a comparative study on the force coefficients under the conditions of R e of 0.189 million, 0.283 million, and 0.378 million. However, the compared objects are NACA0012 with a sharp trailing edge and a flat plate.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Influence of Different Parameters on Numerical Simulation of NACA0012 Incompressible External Flow Field under High Reynolds Numbers

Zhang

2022

Applied Sciences

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Currently, influence analysis of simulation parameters, especially the trailing edge shape and the corresponding modeling method on the force coefficients of NACA0012 under a high Reynolds number, is relatively sparse. In this paper, two trailing edge shapes are designed by three modeling methods and combined with three far-field distances to establish eighteen two-dimensional external flow fields. The same number of structured grids are generated by a unified grid strategy and the SST k-omega and the Spalart–Allmaras models are adopted to solve the NS equations to realize the numerical simulations. Unlike under low Reynolds numbers, the analysis results show that although the accuracy difference between the sharp trailing edge and the blunt trailing edge decreases as the attack angle range increases, the former is preferred in all studied ranges. As to the corresponding modeling methods, the NACA4 and the definition formula are preferred, the choice of which depends on the studied range. In particular, a greater number of data points adopted into the definition formula is not necessarily better. Considering the error ratios comprehensively, the simulation configurations of sharp trailing edge + 20 m far-field distance + SA/SST/SST/SST/SST/SA turbulence model obtains optimal simulation effects.

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The Effect of Various Wedge Flap Configurations on the Performance of Wind Turbine Airfoil

Abdalkarem,

Fazlizan,

Muzammil

et al. 2024

Iran J Sci Technol Trans Mech Eng

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Investigations of Flow Phenomena Over a Flat Plate and NACA0012 Airfoil at High Angles of Attack

Cited by 5 publications

References 16 publications

Determination of the critical velocity of a straight wing with a high aspect ratio

Determination of the critical velocity of a straight wing with a high aspect ratio

Analysis of Influence of Different Parameters on Numerical Simulation of NACA0012 Incompressible External Flow Field under High Reynolds Numbers

The Effect of Various Wedge Flap Configurations on the Performance of Wind Turbine Airfoil

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