Delayed detached eddy simulation of the wind turbine airfoil S809 for angles of attack up to 90 degrees

Xu, He-Yong; Qiao, Chen-Liang; Yang, Hairui; Ye, Zhengyin

doi:10.1016/j.energy.2016.10.131

Cited by 36 publications

(14 citation statements)

References 24 publications

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“…The present CFD code is validated in previous publications, including the S809 airfoil at different Reynolds numbers [37][38][39], the DU97-W-300 and DU97-Flatback airfoils [21], and the CC020-010EJ airfoil [21]. In Xu et al [21], the grid independency study was performed on the DU97-W-300 airfoil rather than the DU97-Flatback airfoil, and the grids for DU97-Flatback and CC airfoil are directly generated based on the scale of the chosen mesh for DU97-W-300 after the grid independency study.…”

Section: Validation Of Cfd Codementioning

confidence: 99%

Flow Control over the Blunt Trailing Edge of Wind Turbine Airfoils Using Circulation Control

Dong

Qiao

et al. 2018

Energies

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Abstract:A new partial circulation control (PCC) method is implemented on the blunt trailing edge DU97-Flatback airfoil, and compared with the traditional full circulation control (FCC) based on numerical analysis. When the Coanda jet is deactivated, PCC has an attractive advantage over FCC, since the design of PCC doesn't degrade aerodynamic characteristics of the baseline flatback section, in contrast to FCC, which is important in practical use in case of failure of the circulation control system. When the Coanda jet is activated, PCC also outperforms FCC in several respects. PCC can produce much higher lift coefficients than FCC over the entire range of angles of attack as well as the entire range of jet momentum coefficients under investigation, but with slightly higher drag coefficients. The flow field of PCC is less complex than that of FCC, indicating less energy dissipation in the main flow and hence less power expenditure for the Coanda jet. The aerodynamic figure of merit (AFM) and control efficiency for circulation control are defined, and results show that PCC has much higher AFM and control efficiency than FCC. It is demonstrated that PCC outperforms FCC in terms of effectiveness, efficiency and reliability for flow control in the blunt trailing edge wind turbine application.

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Section: Validation Of Cfd Codementioning

confidence: 99%

Flow Control over the Blunt Trailing Edge of Wind Turbine Airfoils Using Circulation Control

Dong

Qiao

et al. 2018

Energies

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“…In the attached flow regime at low angle of attacks, all the simulations can give consistent results in agreement with experiment. Visualization of flows showed that 3D DDES can reproduce the realistic 3D flow structure [10].…”

Section: Introductionmentioning

confidence: 99%

Research on Effects of Incidence to Turbine Guide Cascade Aerodynamic Performance

et al. 2019

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When steam turbine set runs, the changes of incidence angle could cause the change of the flow loss in the cascade passages. It was necessary to research the flow performance in steam turbine passages by changing incidence angle. With the help of hydrodynamic software CFX, we could conduct numerical simulations at three incidence angles of 20°, 0°, and-20°, respectively. The computation results indicated that the blades with aft-loading profile had a good adaptation to the incidence angle. After changing incidence angle, the incidence angle affected the distribution of static surface pressure less within most of the scope of pressure surface and suction surface than other location. However, incidence angle −20° would decrease pressure loss within a narrow range, and incidence angle 20° would increase pressure loss.

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“…The reason for this problem is that the blades in the upwind zone interfere with the flow field in the downwind zone during the rotation process of the wind turbine. Consequently, the overall performance of VAWTs deteriorates, particularly the wind energy utilization ratio 4‐6 . To address the problem of low wind energy utilization ratio of VAWTs, considerable research has been conducted to improve airfoil, optimize the wind turbine structure, and control local flow 7‐9 .…”

Section: Introductionmentioning

confidence: 99%

Influences of trailing edge split flap on the aerodynamic performance of vertical axis wind turbine

Zhang

et al. 2020

Energy Science & Engineering

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To improve the performance of a 3.5 kW small H‐type vertical axis wind turbine (VAWT) with the airfoil of NACA0015, a design method for installing split flaps at the trailing edge of a blade is proposed. By solving the two‐dimensional URANS equations, the simulation of VAWTs is carried out. The influences of the length (10% c‐30% c), arrangement positions (90% c‐70% c), and deflection angles (10°‐30°) of the split flaps on the performance of VAWT are determined by orthogonal design when Reynolds number is 2 × 105 and 1 < TSR < 3. In accordance with the influence degrees of these parameters and adopting the maximum wind energy utilization ratio CPmax and the maximum efficient operating range Δλmax as research objectives, the optimum flap length is determined as 22% c, the optimum deflection angle is 10°, and the optimum arrangement position is 92% c. Further studies show that the CPmax is increased by 5.8% and its Δλmax is increased by 25.9% after installing split flaps. Meanwhile, split flaps can change the Kutta‐Joukowsky trailing edge boundary condition, which increases the flow circulation around the airfoil. Also, split flaps can increase the positive pressure difference in the upwind area and reduce the negative pressure difference in the downwind area, which significantly improves the aerodynamic performance of VAWTs.

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Delayed detached eddy simulation of the wind turbine airfoil S809 for angles of attack up to 90 degrees

Cited by 36 publications

References 24 publications

Flow Control over the Blunt Trailing Edge of Wind Turbine Airfoils Using Circulation Control

Flow Control over the Blunt Trailing Edge of Wind Turbine Airfoils Using Circulation Control

Research on Effects of Incidence to Turbine Guide Cascade Aerodynamic Performance

Influences of trailing edge split flap on the aerodynamic performance of vertical axis wind turbine

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