Aerodynamic characteristics of NACA 4412 airfoil section with flap in extreme ground effect

Ockfen, Alex E.; Matveev, Konstantin I.

doi:10.3744/jnaoe.2009.1.1.001

Cited by 20 publications

(17 citation statements)

References 14 publications

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“…The fluid flow which occurs on the downstream side of the hydrofoil is difficult to map as a certain function. Hydrofoils always have the tendency to experience a larger value of drag as the angle of attack increases (Ockfen and Matveev, 2009). A large number of variations in the angle of attack are needed to precisely establish the exact plot of the phenomenon.…”

Section: Resultsmentioning

confidence: 99%

Numerical Study on Influence of Hydrofoil Clearance Towards Total Drag Reduction on Winged Air Induction Pipe for Air Lubrication

Yanuar¹,

Putra²,

Akbar³

et al. 2020

IJTech

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A new device for air lubrication called the Winged Air Induction Pipe (WAIP) is studied in the present work. The device, which consists of an angled hydrofoil, uses the low-pressure region produced above the hydrofoil as a ship moves forward. The low pressure drives the atmospheric air into the water at certain velocities when the pressure is negative compared to atmospheric pressure. A computational fluid dynamics approach is presented in the study of the effect of the hydrofoil clearance of the Winged Air Induction Pipe on the drag reduction experienced by the plate to which the WAIP is attached. The well-known 'volume of fluid' model and k- SST (shear stress transport) turbulence closure model were used in the 2D numerical simulation in ANSYS Fluent. The numerical simulation was conducted with different hydrofoil clearance and angle of attack configurations, and the effects of these parameters on total drag force and drag reduction are reported. The reduction of drag force is found to increase by about 10% compared to the bare plate configuration.

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Section: Resultsmentioning

confidence: 99%

Numerical Study on Influence of Hydrofoil Clearance Towards Total Drag Reduction on Winged Air Induction Pipe for Air Lubrication

Yanuar¹,

Putra²,

Akbar³

et al. 2020

IJTech

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“…Beberapa riset tentang karakteristik aerodinamika NACA 4412 di antaranya eksperimen Ahmed dkk [9] yang meneliti efek ground pada airfoil, serta dua simulasi numerik airfoil yang mempertimbangkan efek dynamic ground oleh Qu dkk [10] dan sebelumnya bentuk airfoil dengan flap pada efek extreme ground [11]. Hasil penelitian menunjukkan pentingnya aspek "ground effect" yang mempengaruhi karakteristik aerodinamika airfoil.…”

Section: Pendahuluanunclassified

“…Simulasi RANS dilakukan dengan menerapkan model turbulensi Spallart-Allmaras sebagaimana pernah dilakukan Ockfen dan Matveev [11]. Untuk mendapatkan perubahan sudut serang sebagaimana dalam eksperimen, sudut kecepatan perlu diatur pada pendefinisian kondisi batas aliran udara.…”

Section: (A) Domain (B) Mesh Gambar 4 Domain Komputasi Dan Meshunclassified

Studi Eksperimental dan Simulasi Numerik Karakteristik Aerodinamika Airfoil NACA 4412

Effendy

Muchlisin

2019

Rot.

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The objective of this study is to investigate the aerodynamics characteristic of airfoil NACA 4412 based on experiment and numerical simulation. A 3D airfoil with chord length (C) of 100 mm and span-width (S) of 200 mm was fabricated in order to be tested by subsonic wind tunnel at inlet air velocity of 10 m/s, whereas numerical study was realised by 2D airfoil reffering to geometrics in the experiment. The structured mesh with 810,000 elements number was constructed by Gambit meshing tools up to reach the near wall resolution of Δy+ = 17.2. Spallart-Almaras turbulence model was applied in the simulation of RANS study.The effect of various angle of attack (α) between -5 and 20 was investigated for both methods in terms of the aerodinamic characteristics such as lift coefficient (CL), drag coefficient (CD), and lift-drag ratio (L/D). The pressure coefficient (CP) and flow visualisations around the airfoil were generated by simulation method. In general, the results show that the data resulted by both methods agree well compared to the other studies, mainly for the lift and drag coefficients. Both coefficients increase with rising the angle of attack before approaching a stall condition at α = 15 o . From this point, lift coefficient drops significantly due to large turbulent wake that reduces to lift and influence to drag. The change of attack angles influences the shifting of both stagnation and expansion points in the leading edge, furthermore it causes the overall aerodynamic characteristics. The increase of pressure difference between upper and lower surfaces of airfoil body causes the rise of lift.

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“…Only limited archived research publications have, however, been devoted to rectangular wings or airfoils in ground effect. 14,15 Note that the aerodynamic characteristics of inverted front wings, with or without trailing-edge flaps, of Formula One race cars in ground effect have been investigated by the research group at the University of Southampton. 16,17 It was found that the downforce increased asymmetrically with a reduction in height and that the maximum downforce was dictated by gains in downforce from lower-surface suction increases and losses in downforce caused by upper-surface pressure.…”

Section: Introductionmentioning

confidence: 99%

“…Ockfen et al, 15 investigated experimentally the ground proximity (for h/c=5% to 15%) on the aerodynamic properties of a NACA 4412 with a plain trailing-edge flap (TEF) at 2 o α = and 6 o for Re=10 6 . They observed that the TEF deflection increased the amount of flow trapped underneath the airfoil, leading to a considerable slowdown of the flow speed in this region and subsequently a large pressure recovery beneath the airfoil.…”

Section: Introductionmentioning

confidence: 99%

Ground effect on the aerodynamics of a naca 0015 airfoil with a plain trailing-edge flap

Dionne¹,

Lee²

2018

FMRIJ

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Aerodynamic characteristics of NACA 4412 airfoil section with flap in extreme ground effect

Cited by 20 publications

References 14 publications

Numerical Study on Influence of Hydrofoil Clearance Towards Total Drag Reduction on Winged Air Induction Pipe for Air Lubrication

Numerical Study on Influence of Hydrofoil Clearance Towards Total Drag Reduction on Winged Air Induction Pipe for Air Lubrication

Studi Eksperimental dan Simulasi Numerik Karakteristik Aerodinamika Airfoil NACA 4412

Ground effect on the aerodynamics of a naca 0015 airfoil with a plain trailing-edge flap

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