Numerical Simulation of Unsteady Aerodynamic Performance of Novel Adaptive Airfoil for Vertical Axis Wind Turbine

Tong, Hui; Fang, Jiaojiao; Guo, Jinyang; Lin, Kun; Wang, Ying

doi:10.3390/en12214106

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…In the simulations, because the Reynolds number is greater than the critical Reynolds number under subsonic and supersonic conditions, a turbulence model is introduced to consider the effect of turbulence on the calculated results (Tong et al 2019).…”

Section: Turbulent Airflow Modelmentioning

confidence: 99%

Self-Turning Process and Aerodynamic Characteristics of Slender Bodies with Different Center-of-Gravity Positions

2022

JAFM

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To achieve an automatic technology for over-the-shoulder (OTS) launching of air-to-air missiles, this study numerically simulated the overturning process of a slender body by using the dynamic mesh method in the ANSYS Fluent 2021 software. Motion trends and force conditions during the self-turning process were obtained for different center of gravity positions. This investigation showed that a proper center of gravity position was essential for achieving the self-turning of a slender body at high and extra-wide angles of attack. The pressure center of the slender body jumped (discontinuously changed) during the overturning process. The change in the relative position between the pressure center and the center of gravity caused the angular velocity of the slender body to first increase, then decrease and gradually stabilize. These results can be used as a reference for designing the structures of self-turning slender bodies and to realize a new technology for the OTS launching of air-to-air missiles.

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Section: Turbulent Airflow Modelmentioning

confidence: 99%

Self-Turning Process and Aerodynamic Characteristics of Slender Bodies with Different Center-of-Gravity Positions

2022

JAFM

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“…The SST k-ω turbulence model is a two-equation eddy viscosity turbulence model, which is based on the baseline k-ω mode and considers the transport of the turbulence shear stress in the definition of the turbulent viscosity [20]. The Wilcox k-ω turbulence model is utilized in the inner region of the boundary layer and the standard k-ε model is utilized in free shear flows and the outer area [21]. The transport equation for the turbulent kinetic energy k is: The transport equation for the specific consumption rate ω is:…”

Section: Geometrical Parameters Of the Turbine And Cfd Simulation Str...mentioning

confidence: 99%

Influences of Geometrical Parameters of Upstream Deflector on Performance of a H-Type Vertical Axis Marine Current Turbine

Zhou

Sun

2021

Energies

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Marine current power is a kind of renewable energy that has attracted increasing attention because of its abundant reserves, high predictability, and consistency. A marine current turbine is a large rotating device that converts the kinetic energy of the marine current into mechanical energy. As a straight-bladed vertical axis marine current turbine (VAMCT) has a square or rectangular cross-section, it can thus have a larger swept area than that of horizontal axis marine current turbines (HAMCT) for a given diameter, and also have good adaptability in shallow water where the turbine size is limited by both width and depth of a channel. However, the low energy utilization efficiency of the VAMCT is the main bottleneck that restricts its application. In this paper, two-dimensional numerical simulations were performed to investigate the effectiveness of an upstream deflector on improving performance of the straight-bladed (H-type) marine current turbine. The effects of various key geometrical parameters of the deflector including position, length, and installation angle on the hydrodynamic characteristics of the VAMCT were then systematically analyzed in order to explore the mechanism underlying the interaction between the deflector and rotor of a VAMCT. As a result, the optimal combination of geometrical parameters of the deflector by which the maximum energy utilization efficiency was achieved was a 13.37% increment compared to that of the original VAMCT. The results of this work show the feasibility of the deflector as a potential choice for improving the energy harvesting performance of a VAMCT with simple structure and easy implementation.

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“…Blades that undergo adaptive changes in surface shape according to the above rules will have a higher capacity in absorbing wind energy, and effectively improve the wind energy extraction efficiency for this type of VAWT. Based on Ying's research, Tong et al [17] designed and made a blade model suitable for VAWT whose leading edge and trailing edge can have active changes simultaneously with the single input motivation. Firstly, based on the continuous deflection and deformation method of the leading and trailing edges of the airfoil with constant thickness (according to the wing rib concept and NACA0012 airfoil as an example), the blade deformation with different curvatures were achieved by applying a pre-tightening force.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the comparison revealed that the aerodynamic performance characteristics of the blade under different deformation factors, and the results could provide reference for subsequent unsteady experiments. Tong et al [17] have also conducted numerical simulation concerning the influence of the active deformation movement of the uniform-thickness mid-curve on the aerodynamic performance of the airfoil with NACA0012 as the reference airfoil at different angles of attack before and after the stall. Under the condition that the maximum deformation position of the airfoil was at 0.4 c, the incoming wind speed was of 9 m/s, the airfoil chord length was of 0.4 m, and the Reynolds number was of 2.5 × 10 5 .…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Aerodynamic Performance of Different Forms of Adaptive Blades for Vertical Axis Wind Turbines

2021

Self Cite

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The wind energy exploitation technique has been developed very quickly in recent years. The vertical axis wind turbine is a hot research domain due to several advantages: low noise, flexible for installation, ease of maintenance, great safety and credibility, etc. The aerodynamic performances of different forms of airfoils including an active deformation airfoil and a fluid-solid coupling passive airfoil with two-dimensional (2D) and three-dimensional (3D) cases have been investigated numerically in this paper. Firstly, the aerodynamic performances of the airfoils with the maximum deformation amplitudes of their cambers which are 3%, 5% and 7% of the chord length have been discussed, respectively, with the angles of attack in the range of 0° and 20°. Secondly, for the angle of attack set at 18°, the two-way fluid-solid coupling simulations with the Young’s Modulus of 1 Mpa and 2 Mpa have also been investigated. Results show that: (1) for the pseudo 3D and real 3D single active deformation airfoil cases, the lift coefficients increase as the maximum deformation amplitudes augment from 3% to 7% of the chord length at the same angle of attack. With the same maximum deformation amplitude, when the angles of attack increase from 0° to 20°, the lift coefficients which increase firstly and then decrease are bigger than that of the original NACA0012 airfoil. When the maximum deformation amplitude of the pseudo 3D airfoil reaches 5% of the chord length, a relatively good aerodynamic performance with better inhibition effect of vortex generation can be obtained. The 3D vortex distribution demonstrates that the deformable airfoil has a better vortex generation controlling effect at the middle cross-section along the spanwise direction than the non-deformable airfoil. (2) From the aspect of fluid-solid coupling, the lift increases and the drag decreases so that the lift to drag ratio has a big improvement when the Young’s Modulus is equal to 1Mpa and 2Mpa. The deformable airfoil can inhibit the generation and the shedding of the surface vortex when the fluid-solid coupling effect is considered.

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Numerical Simulation of Unsteady Aerodynamic Performance of Novel Adaptive Airfoil for Vertical Axis Wind Turbine

Cited by 5 publications

References 19 publications

Self-Turning Process and Aerodynamic Characteristics of Slender Bodies with Different Center-of-Gravity Positions

Self-Turning Process and Aerodynamic Characteristics of Slender Bodies with Different Center-of-Gravity Positions

Influences of Geometrical Parameters of Upstream Deflector on Performance of a H-Type Vertical Axis Marine Current Turbine

Numerical Study on Aerodynamic Performance of Different Forms of Adaptive Blades for Vertical Axis Wind Turbines

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