Effect of turbulent inflows on airfoil performance for a Horizontal Axis Wind Turbine at low Reynolds numbers (part I: Static pressure measurement)

Li, Qingan; Kamada, Y.; Maeda, Takao; Murata, Junsuke; Nishida, Yusuke

doi:10.1016/j.energy.2016.06.021

Cited by 30 publications

(6 citation statements)

References 39 publications

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“…Wind turbines run in the atmospheric boundary layer, where wind shear [1][2][3][4] and turbulence [5][6][7] are the main features that have important effects on the aerodynamic performance of blades, and affect the power generation. The use of 2D wind tunnel data in the present blade design method based on blade element momentum (BEM) [8] will introduce uncertainty for predicting aerodynamic performance of blades.…”

Section: Introductionmentioning

confidence: 99%

Development and Validation of Aerodynamic Measurement on a Horizontal Axis Wind Turbine in the Field

Zhang

Yang

2019

Applied Sciences

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Aerodynamic measurement on horizontal axis wind turbines in the field is a challenging research topic and also an essential research method on the aerodynamic performance of blades in real atmospheric inflow conditions. However, the angle of attack is difficult to determine in the field due to the unsteadiness and unevenness of the inflow. To study the measuring and analyzing method of angle of attack in the field, a platform was developed based on a 100 kW wind turbine from the Institute of Engineering Thermophysics (IET) in China in this paper. Seven-hole probes were developed and installed at the leading edge to measure the inflow direction, static and total pressure at the near field. Two data reducing processes, sideslip angle correction, and induced velocity correction, were proposed to determine the effective angle of attack based on the inflow data measured by probes. The aerodynamic measurement platform was first validated by the comparison with wind tunnel results. Then some particular aerodynamic phenomenon in the field were discussed. As a result, the angle of attack varies quasi-periodically with the rotation of the rotor, which is caused by the yaw angle of the inflow. The variation of angle of attack induces dynamic response of a clockwise hysteresis loop in lift coefficient. The dynamic response is the main source of a dispersion of instantaneous lift coefficients with a standard deviation of 0.2.

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Section: Introductionmentioning

confidence: 99%

Development and Validation of Aerodynamic Measurement on a Horizontal Axis Wind Turbine in the Field

Zhang

Yang

2019

Applied Sciences

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“…Stack et al [ 25 ] initiated the study on the effect of turbulence intensity on the aerodynamic forces acting over various airfoil models in the presence and absence of a turbulence grid in a wind tunnel and found that the increase in turbulence intensity results in an increase in (C L,max ) and effectively delays the stall. On the other hand, Li et al [ 26 ] suggested that higher turbulence levels can hinder flow separation on the surface of the airfoil. Aiming at identifying the influence of turbulence intensity on the aerodynamic characteristics of the variously modified leading-edge protuberanced wing configuration, Arunvinthan et al [ 14 ] experimentally evaluated the LEP wings at various TI.…”

Section: Introductionmentioning

confidence: 99%

Effect of Trough Incidence Angle on the Aerodynamic Characteristics of a Biomimetic Leading-Edge Protuberanced (LEP) Wing at Various Turbulence Intensities

Arunvinthan,

Gouri,

Divysha

et al. 2024

Biomimetics

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A series of wind tunnel tests were performed to investigate the effect of turbulent inflows on the aerodynamic characteristics of variously modified trough incident leading-edge-protuberanced (LEP) wing configurations at various turbulence intensities. A self-developed passive grid made of parallel arrays of round bars was placed at different locations of the wind tunnel to generate desired turbulence intensity. The aerodynamic forces acting over the trough incidence LEP wing configuration where obtained from surface pressure measurements made over the wing at different turbulence intensities using an MPS4264 Scanivalve simultaneous pressure scanner corresponding to a sampling frequency of 700 Hz. All the test models were tested at a wide range of angles of attack ranging between 0°≤α≤90° at turbulence intensities varying between 5.90% ≤ TI ≤ 10.54%. Results revealed that the time-averaged mean coefficient of lift (CL) increased with the increase in the turbulence intensity associated with smooth stall characteristics rendering the modified LEP test models advantageous. Furthermore, based on the surface pressure coefficients, the underlying dynamics behind the stall delay tendency were discussed. Additionally, attempts were made to statistically quantify the aerodynamic forces using standard deviation at both the pre-stall and the post-stall angles.

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“…Results suggested that blade pitch angle and yaw angle affect the performance of HAWT but turbulence intensity could be neglected. Li et al, 2016(c) [20] presented the effect of turbulence intensity on HAWT performance and suggested that for Re No. ≥ 1.5 × 10 5, there is a significant increase in lift coefficient at higher turbulence intensity and the drag coefficient is smaller in a turbulent flow field.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of stall characteristics for winglet blade of a horizontal axis wind turbine

et al. 2021

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Wind energy is one of the renewable energy resources which is clean and sustainable energy and the wind turbine is used for harnessing energy from the wind. The blades are the key components of a wind turbine to convert wind energy into rotational energy. Recently, wingtip devices are used in the blades of horizontal axis wind turbine (HAWT), which decreases the vortex and drag, while increases the lift and thereby improve the performance of the turbine. In the present study, a winglet is used at the tip of an NREL phase VI wind turbine blade. Solidworks, Pointwise, and Ansys-Fluent are used for geometric modeling, computational grid generation, and CFD simulation, respectively. The computational result obtained using SST k-ω turbulence modeling is well validated with the experimental data of NREL at 5 and 7 m/s of wind speeds. Numerical investigation of stall characteristics is carried out for wingleted blade at higher turbulence intensity (21% and 25%) and angle of attack (00 to 300 at 50 intervals) at 7 m/s wind speed. The result found that wingletd blade delay stall to 150 for both the cases of turbulence intensity. Increasing the turbulence intensity increases the lift coefficient at stall angle but drag coefficient also increases and thus a lower aerodynamic performance (CL/CD ratio = 13) is obtained. Wingleted blade improves the performance as the intensity of vortices is smaller compared to baseline blade

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Effect of turbulent inflows on airfoil performance for a Horizontal Axis Wind Turbine at low Reynolds numbers (part I: Static pressure measurement)

Cited by 30 publications

References 39 publications

Development and Validation of Aerodynamic Measurement on a Horizontal Axis Wind Turbine in the Field

Development and Validation of Aerodynamic Measurement on a Horizontal Axis Wind Turbine in the Field

Effect of Trough Incidence Angle on the Aerodynamic Characteristics of a Biomimetic Leading-Edge Protuberanced (LEP) Wing at Various Turbulence Intensities

Numerical investigation of stall characteristics for winglet blade of a horizontal axis wind turbine

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