Research on aerodynamic performance of a novel dolphin head-shaped bionic airfoil

Huang, Shengxian; Hu, Yueyang; Wang, Ying

doi:10.1016/j.energy.2020.118179

Cited by 34 publications

(8 citation statements)

References 26 publications

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“…The grid independence verification method of the original airfoil can be referred to the previously published literature (Huang et al 2021). Four sets of grids with different numbers of grids are selected for comparative analysis, and the number of grids is 63000, 127000, 191000 and 255000, represented by Mesh-1, Mesh-2, Mesh-3 and Mesh-4, respectively.…”

Section: Verification Of Calculation Methodsmentioning

confidence: 99%

“…Four sets of grids with different numbers of grids are selected for comparative analysis, and the number of grids is 63000, 127000, 191000 and 255000, represented by Mesh-1, Mesh-2, Mesh-3 and Mesh-4, respectively. According to previous experience (Huang et al 2021), to save the calculation cost, in the numerical simulation study of this paper, the steady state is used for calculation before the stall occurs on the airfoil surface, and the transient state is used for calculation after the stall. When Re=1.610 5 , the above four kinds of grids are used to simulate the lift and drag coefficients with attack angles of 0° to 18°, and the result is shown in Fig.…”

Section: Verification Of Calculation Methodsmentioning

confidence: 99%

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Numerical Study of Aerodynamic Performance of Airfoil with Variable Curvature Split Flap

2023

JAFM

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To further improve the lift-rising effect of the attached flap on an airfoil, based on the unique movement pattern of a fluke when a dolphin moves forward, this paper puts forward a novel attached split flap model with variable curvature. The lift-type vertical axis wind turbine's typical blade airfoil NACA 0018 is taken as the research object. First, the aerodynamic performance of the two-dimensional airfoil is simulated based on the SST k-ω turbulence model. The contrast between the simulation and the experimental results proves the correctness of the numerical simulation methods in this paper. Then, the effectiveness of split flap is verified, and the lift-rising principle is briefly analyzed. Finally, the parametric study is carried out based on the flap model with variable curvature proposed in this paper, and the lift-rising principle of the variable curvature split flap is analyzed in detail. The results indicate that, with the rise of the flap's curvature index, the airfoil's lift coefficient (Cl) integrated with the flap gradually increases accordingly and tends to a constant value. The bionic research in this paper can provide a comprehensive reference for the aerodynamic shape design of airfoil trailing edge flap and the further optimization of energy efficiency of rotating machinery or aviation.

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Section: Verification Of Calculation Methodsmentioning

confidence: 99%

Section: Verification Of Calculation Methodsmentioning

confidence: 99%

Numerical Study of Aerodynamic Performance of Airfoil with Variable Curvature Split Flap

2023

JAFM

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“…Many methods for solving problems have been found using biological geometry, physiological functions or life processes in engineering practice (Hong et al, 2009). Huang et al (2020) designed three new dolphin-type hydrofoils based on the contour curve of a dolphin and compared them with NACA0018 aerofoils. They found that the hydrofoils have the best lift-drag characteristics when the deflection angle is 24 °.…”

Section: Introductionmentioning

confidence: 99%

The Leading-Edge Structure Based on Geometric Bionics Affects the Transient Cavitating Flow and Vortex Evolution of Hydrofoils

Yan

Zhang

Jun-hua³

et al. 2022

Front. Energy Res.

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A hydrofoil is a fundamental structure in fluid machinery, and it is widely applied to the fields of propellers, blades of axial flow pumps and underwater machinery. To reveal that the geometric structure of the leading-edge of a hydrofoil is the mechanism that affects the transient cavitating flow, we regard the three fish-type leading-edge structures of mackerel, sturgeon and small yellow croaker as the research objects and use high-precision non-contact 3D scanners to establish three bionic hydrofoils (Mac./Stu./Cro.). We use large eddy simulation to simulate the transient cavitating flow of hydrofoils numerically and compare and analyze their lift–drag characteristics, the transient behavior of unsteady cavitation and the vortex evolution. The numerical simulation results are in good agreement with the experimental results. The warping of leading-edge structure will cause a change in lift–drag characteristics, and the Cro. hydrofoil has a good lift-to-drag ratio. When the leading-edge structure is tilted upward (Cro. hydrofoil), the position of the attached cavity will move forward, which will accelerate the cavitation evolution and improve the velocity fluctuation of the trailing edge. When the leading-edge structure is tilted downward (Stu. hydrofoil), the change in the vortex stretching and dilatation terms will be complex, and the influence area of the vortex will widen.

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“…Authors emphasized its energy implications. Drag is very related for energy consumption and environmental impacts and hence, researchers are trying to nd innovative geometries to reduce drag by having inspirations from nature (Huang et al 2021). Obtained experiences are adapted in real world applications.…”

Section: Introductionmentioning

confidence: 99%

Impact assessment of new generation high-speed agricultural tractor aerodynamics on transportation fuel consumption and related phenomena

Canlı

Küçüksariyildiz

Çarman

2022

Environ Sci Pollut Res

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New generation agricultural tractors contribute to transportation by increased travel speeds. There is not any available aerodynamic data on authentic agricultural tractor form. On-road transportation by tractors is between 8 to 30% of their operational time. In this work, two agricultural tractors are modelled via computational uid dynamics for nine different speeds to determine aerodynamic resistances.Corresponding speeds are 10 to 80 km/h with 10 km/h increments and additionally 5 km/h. Reynolds number changes between 1.6×10 5 and 2.98×10 6 . The characteristic lengths are taken as the square root of the streamwise projected area of the tractor geometries. Aerodynamic forces exerted on the tractors change between 3 N to 746 N. The calculated drag coe cients are found as independent from Reynolds number and are 0.6 and 0.78 for the two different types of driver compartments. Constant speed travel scenarios are analysed. The approximated aerodynamic related fuel consumptions for one-hour changes between 0.002 to 8.28 lt/s which correspond to 0.001 to 5.76 kg/s carbon emission. A potential improvement in decreasing aerodynamic resistance about 20% is discussed by spatial data. Since the conducted work is being regarded as the rst instance in the literature, it is estimated that several consecutive reports will be triggered.

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Research on aerodynamic performance of a novel dolphin head-shaped bionic airfoil

Cited by 34 publications

References 26 publications

Numerical Study of Aerodynamic Performance of Airfoil with Variable Curvature Split Flap

Numerical Study of Aerodynamic Performance of Airfoil with Variable Curvature Split Flap

The Leading-Edge Structure Based on Geometric Bionics Affects the Transient Cavitating Flow and Vortex Evolution of Hydrofoils

Impact assessment of new generation high-speed agricultural tractor aerodynamics on transportation fuel consumption and related phenomena

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