Effect of surface blowing on aerodynamic characteristics of tubercled straight wing

Ganesh, N; Arunvinthan, S.; Pillai, S. Nadaraja

doi:10.1016/j.cja.2019.02.006

Cited by 17 publications

(3 citation statements)

References 21 publications

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“…GANESH N et al used the CFD method to numerically study the flow field structure of NACA63 (4) -021 wing with steady-suction AFC. The results show that the aerodynamic performance can be improved by 28% by equipping suction at 0.3 times the chord length from the wing's leading edge [9]. Fatahian et al conducted numerical studies on the steady-suction AFC of the NACA0012 flap.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Steady-Stream Active Flow Control for the Blended-Winged-Body Underwater Glider

Liu

Song

2023

JMSE

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The BWB-UG is a glider with a smooth and integrated fuselage and wing. Its lift-to-drag properties are some of the most significant factors affecting its performance. In order to improve its hydrodynamic characteristics, the method of steady-stream active flow control (SS-AFC) is proposed. The computational fluid dynamics method is used to numerically investigate the SS-AFC of the BWB-UG. The mechanism of the SS-AFC effect on the lift-to-drag characteristics is revealed from the flow field aspect. The flow field of the BWB-UG before and after installing the SS-AFC was simulated using FLUENT. The results show that the SS-AFC can effectively optimise the hydrodynamic characteristics of the BWB-UG and can optimise the structure of the flow field around the BWB-UG. The steady-suction AFC can increase the lift-to-drag ratio of the BWB-UG by up to 45.01%. With the steady-jet AFC, the lift-to-drag ratio of the BWB-UG can be increased by as much as 93.17%.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Steady-Stream Active Flow Control for the Blended-Winged-Body Underwater Glider

Liu

Song

2023

JMSE

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“…Joseph et al (2019) worked on the leading-edge tubercle effect on different types of wings at a low Reynolds number. Ganesh et al (2019) numerically investigated the effect of surface blowing on aerodynamic characteristics of tubercle leading-edge wing considering different angles of attack and blowing velocity ratio. Li et al (2021) investigated the theoretical and practical effect of wavy leading-edge protuberances on a Clark-y threedimensional hydrofoil.…”

Section: Introductionmentioning

confidence: 99%

Various Wavy Leading-Edge Protuberance on Oscillating Hydrofoil Power Performance

2023

JAFM

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This paper is presented to compare various wavy leading-edge protuberances on oscillating hydrofoil performance and power efficiency. The unsteady turbulent 3D flow simulations were carried out by using the StarCCM+ software. The 3D hydrofoil with a straight at the leading-edge is a NACA0015 section with a chord of 0.24 m and an aspect ratio of 7. Four new types of hydrofoils are proposed with wavy leading-edge protuberance. The RANS equations with the realizable k–ε turbulence model are used to predict the turbulent flow around the hydrofoil under different conditions. In order to validate, a comparison of the numerical results of the forces coefficients and power efficiency of non-protuberance oscillating hydrofoil are shown in good agreement with experimental data. Then, four new profiles on the leading-edge of the hydrofoils are simulated and many results of the pressure distribution, vorticity contour, streamline velocity, and power coefficient for five hydrofoil types are presented and discussed. It is concluded that the hydrofoil of Type-M can achieve constantly higher efficiency of over 46% by employing appropriate heave and pitch amplitudes.

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“…In count, flow visualization studies capture laminar separation bubbles that should be suppressed by using modifications in the airfoil geometry to improve the aerodynamic efficiency (Kemal et al , 2022). Generally, the genuine effect of extending the trailing edge of the wing helps to improve the aerodynamic performance of the aircraft depending on the airfoil camber and delays the flow separation at the trailing edge (Ganesh et al , 2019) as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Effect of turbulence intensity on aerodynamic characteristics of extended trailing edge airfoil

Livya

Pillai

2022

AEAT

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Purpose This paper aims to study the extended trailing edge airfoil for a range of angle of attack at different intensities of turbulence. Design/methodology/approach In this paper, an experimental study on NACA 0020 airfoil with thin extended trailing edge modification of amplitude of h = 0.1c, 0.2c and 0.3c at the Reynolds number of 2.14 × 105 are tested. The research was carried out for an angle of attack ranging from 0° = α = 35° for the turbulence intensity of 0.3%, 3%, 5%, 7% and 12%. From the experimental readings, the surface pressures are scanned using a Scanivalve (MPS2464) pressure scanner for a sampling frequency of 700 Hz. The scanned pressures are converted to aerodynamic force coefficient and the results are combined and discussed. Findings The airfoil with the extended trailing edge will convert the adverse pressure gradient to a plateau pressure zone, indicating the delayed flow separation. The CL value at higher turbulence intensity (TI = 12%) for the extended trailing edge over perform the base airfoil at the post-stall region. The maintenance of flow stability is observed from the spectral graph. Practical implications A thin elongated trailing edge attached to the conventional airfoil serves as a flow control device by delaying the stall and improving the lift characteristics. Additionally, extending the airfoil's trailing edge helps to manage the performance of the airfoil even at a high level of turbulence. Originality/value Distinct from existing studies, the presented results reveals how the extended trailing edge attached to the airfoil performs in the turbulence zone ranging from 0.3% to 12% of TI. The displayed pressure distribution explains the need for increasing trailing edge amplitude (h) and its impact on flow behaviour. The observation is that extended trailing edge airfoil bears to maintain the performance even at higher turbulence region.

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Effect of surface blowing on aerodynamic characteristics of tubercled straight wing

Cited by 17 publications

References 21 publications

Analysis of the Steady-Stream Active Flow Control for the Blended-Winged-Body Underwater Glider

Analysis of the Steady-Stream Active Flow Control for the Blended-Winged-Body Underwater Glider

Various Wavy Leading-Edge Protuberance on Oscillating Hydrofoil Power Performance

Effect of turbulence intensity on aerodynamic characteristics of extended trailing edge airfoil

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