Improvement of aerodynamic performance of an offshore wind turbine blade by moving surface mechanism

Salimipour, Erfan; Yazdani, Shima

doi:10.1016/j.oceaneng.2019.106710

Cited by 23 publications

(9 citation statements)

References 33 publications

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“…The results showed that the lift coefficient of the airfoil increased by 103%, the drag coefficient decreased by 40%, and the stall angle was delayed by 25° at a velocity ratio of 6. Salimipour et al 36 investigated the effects of the location and speed of the moving surface on the flow characteristics of the S809 airfoil and found that the aerodynamic performance of the airfoil could be effectively improved by using a moving surface with appropriate speed and location. In addition, the aerodynamic performance of a three‐bladed HAWT in the TSR range of 4–9 was also examined.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of an H‐Darrieus vertical axis wind turbine via moving surface boundary‐layer control

Zhang

Sun

2023

Energy Science & Engineering

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The moving surface boundary-layer control method (MSBC) is a kind of active flow control methods that overcomes the adverse pressure gradient and suppresses the flow separation by directly energizing the boundary layer near the moving surface. In this study, computational fluid dynamics simulations were performed to investigate the feasibility of using MSBC to improve the aerodynamic performance of a straight-bladed H-Darrieus vertical axis wind turbine (VAWT). In doing so, a segment of the original surface of the VAWT blade was then replaced with a moving surface. Influences of different geometric and motion parameters of moving surface, including location, length, velocity ratio, and groove depth on the net power coefficient of VAWT, were systematically studied. Moreover, the sensitivity of different parameters to the net power coefficient of VAWT at the optimal tip speed ratio was analyzed via the orthogonal design method. As a result, the optimal combination of moving surface parameters was able to be determined. The present results show that the maximum net power coefficient of VAWT having blades with partially moving surface can be increased by 22.8% compared with that of the baseline VAWT. In addition, the effectiveness of two active flow control methods, co-flow jet and moving surface, in improving aerodynamic performance of a VAWT was also compared. It is found that MSBC method has the potential to achieve superior control performance and promote the energy utilization coefficient of the VAWT more effectively by using comparatively less external energy input.

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Section: Introductionmentioning

confidence: 99%

Performance enhancement of an H‐Darrieus vertical axis wind turbine via moving surface boundary‐layer control

Zhang

Sun

2023

Energy Science & Engineering

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“…This trend continues up to a specific angle, called the stall angle. When stall happens, devastating effects on aerodynamic performance occur; the lift coefficient dramatically decreases while the drag coefficient continues to increase [9,10]. Thus, applying methods to control the stall phenomenon and control the separation flow is of great importance.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of Co-flow Jet Effects on Airfoil Aerodynamic Characteristics

Yazdani

Salimipour

2021

Preprint

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The present paper numerically investigates the performance of a Co-Flow Jet (CFJ) on the static and dynamic stall control of the NACA 0024 airfoil at Reynolds number 1.5 × 105. The two-dimensional Reynolds-averaged Navier-Stokes equations are solved using the SST k-ω turbulence model. The results show that the lift coefficients at the low angles of attack (up to α = 15̊) are significantly increased at Cµ = 0.06, however for the higher momentum coefficients, it is not seen an improvement in the aerodynamic characteristics. Also, the dynamic stall for a range of α between 0̊ and 20̊ at the mentioned Reynolds number and with the reduced frequency of 0.15 for two CFJ cases with Cµ = 0.05 and 0.07 are investigated. For the case with Cµ = 0.07, the lift coefficient curve did not present a noticeable stall feature compared to Cµ = 0.05. The effect of this active flow control by increasing the Reynolds numbers from 0.5 × 105 to 3 × 105 is also investigated. At all studied Reynolds numbers, the lift coefficient enhances as the momentum coefficient increases where its best performance is obtained at the angle of attack α = 15̊.

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“…Moving surface is an active control device, composed of the rotors and the rotation surface, the rotors driven the surface rotated along the chord of the airfoil. Salimipour and Yazdani 31 investigated the effects of the moving surface on its flow control function. The aerodynamic performance of the airfoil can be improved by increasing the kinetic energy of the boundary layer with the help of the moving surface.…”

Section: Introductionmentioning

confidence: 99%

Investigation of leading-edge slat on aerodynamic performance of wind turbine blade

Chen

Jiang

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, the numerical simulation was used to investigate the effects of the leading-edge slat installation angles ( β for airfoils from 0° to 40° and β1 for blades from −20° to 40°) on the aerodynamic characteristics of the airfoil and the wind turbine blade. The chord length of the leading-edge slat is 0.1c (the chord length of the clean airfoil). The horizontal and vertical distances from its center to the leading edge of the clean airfoil are 0.005c and 0.009c, respectively. The results indicated that the lift coefficient could be significantly improved by the leading-edge slat (except β = 40°) when the attack angle exceeded 10.2°. For β = 0°, the lift coefficient increased the most. The trailing vortex of the leading-edge slat played an important role at the process of flow control. It could transfer kinetic energy from the bounder layer to its out-flow region. Furthermore, the vorticities of trailing vortex generated by the leading-edge slat with different installation angles were different, promoting several effects on the airfoil at the different cases. The torque of the blade with leading-edge slat (except β1 = −20°) was improved significantly as the leading-edge slat trailing-vortices became stronger with the higher wind-speeds.

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Improvement of aerodynamic performance of an offshore wind turbine blade by moving surface mechanism

Cited by 23 publications

References 33 publications

Performance enhancement of an H‐Darrieus vertical axis wind turbine via moving surface boundary‐layer control

Performance enhancement of an H‐Darrieus vertical axis wind turbine via moving surface boundary‐layer control

A Numerical Investigation of Co-flow Jet Effects on Airfoil Aerodynamic Characteristics

Investigation of leading-edge slat on aerodynamic performance of wind turbine blade

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