Experimental Study on Wake Evolution of a 1.5 MW Wind Turbine in a Complex Terrain Wind Farm Based on LiDAR Measurements

Zhao, Fei; Gao, Yihan; Wang, Tengyuan; Yuan, Jinsha; Gao, Xiaoxia

doi:10.3390/su12062467

Cited by 11 publications

(6 citation statements)

References 37 publications

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“…Equation (15) shows the laminar flow for (b = 1) and turbulent flow for (b . 1) for the wind speed inside boundary layers.…”

Section: Mathematical Modeling and Solutionsmentioning

confidence: 99%

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Fluctuating pressure gradients and corrugated surfaces effects on wind turbines power output

Duwairi,

Sukkar,

Alrbai

2024

Advances in Mechanical Engineering

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This paper investigates the effect of corrugated surfaces on the wind turbines power output for both laminar and turbulent flows. Conservation principles including continuity and momentum equations, wind turbine power equations, and the corrugated surface equation have been implemented to build up a theoretical model then which has been solved using MATLAB. This model simulates wind turbines power output and analyzes several case studies implementing different parameters such as air pressure wave amplitude (Po), air wave fluctuation frequency (n), and wind layer turbulence (b). Also, different complex terrains in two main scenarios representing two different positions (X) of the wind turbine are analyzed. This analysis indicates the importance of wind turbines micro siting. In addition, it is found that increasing the pressure ratio increased wind turbine power output, while increasing the frequency decreased the power ratio of the wind turbines for both laminar and turbulent flow conditions. Increasing turbulence for the turbulent model increased the power ratio.

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“…Equation (15) shows the laminar flow for (b = 1) and turbulent flow for (b . 1) for the wind speed inside boundary layers.…”

Section: Mathematical Modeling and Solutionsmentioning

confidence: 99%

“…Rewriting equation (17) with the dimensionless variable h and replacing (y) by (r + H b ) in equation (15) and integration limits across rotor blades between gives the power output as: Where H b represents the wind turbine hub height (m).…”

Section: Mathematical Modeling and Solutionsmentioning

confidence: 99%

Fluctuating pressure gradients and corrugated surfaces effects on wind turbines power output

Duwairi,

Sukkar,

Alrbai

2024

Advances in Mechanical Engineering

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“…Winstroth et al measured 3D movement and obtained the deflection of 3.2 MW wind turbine blades using DIC and showed that 3D DIC could be a potential method for monitoring the condition of wind turbine blades [22]. Zhao et al measured the fullfield displacement of the blades of a 1.5 MW wind turbine using a system of three stereo cameras [23]. Carr et al performed dynamic tests on wind turbine blades and obtained the corresponding full-field strain measurements using DIC [24].…”

Section: Introductionmentioning

confidence: 99%

Application of 3D Digital Image Correlation Technique to Measurement of Wind Blade Properties from Coupon Test and Small-Sized-Blade Frequency Test

Ha,

Kang,

Kwon

et al. 2024

Energies

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As a wind blade is getting larger, its structural behavior becomes more complex and thus the risk of blade structural failure becomes higher. Generally, structural integrity is proved through blade testing with contact measurement devices such as strain gauges. However, contact measurement can only measure the physical quantities from installation points and requires lengthy cables to transmit the electrical signals to a data acquisition system, which can cause signal noise and add unnecessary weight. Recently, noncontact measurement techniques such as digital image correlation (DIC) have been widely used in various industries to process images captured from cameras and generate full-field strains and displacements without any mechanical connections such as cables. In this study, the application of three-dimensional DIC to wind blades was investigated; in addition, the material properties of glass-fiber-reinforced plastics used in blades for the measurement of the first frequency were also studied. Tensile testing was performed using coupons equipped with strain gauges and speckle patterns. In addition, a small blade from a 10 kW wind turbine was utilized to measure the first flapwise frequency using DIC and modal tests; the results showed a 2.1% difference between the two different measurements. This research showed that the DIC technique could be an alternative replacement for the traditional measurement technique upon further validation tests.

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“…Literature [5] used two LiDARs to study the three-dimensional wake characteristics of a 1.5 MW wind turbine and verified the wake model. Literature [6] adopted two LiDARs to research the development trend of wake in mountainous terrain.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on wake interference characteristics of horizontal-axis wind turbine

Li,

Cai,

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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To investigate the flow field distribution under the interference of multiple wind turbine wakes, two different types of ground-based LiDARs were used to conduct wind measurement experiments in a wind farm. Taking the wake field distribution characteristics of two wind turbines as an example, combined with wind measurement data, the complex wake interference flow field is classified into three typical interference conditions: non-wake, partial wake and full wake. And the wake development characteristics under the above three wake conditions are quantitatively analyzed. The results show that under the condition of non-wake interference, the wakes are independent of each other, the wake recovery rate is basically the same. Under partial wake and full wake interference conditions, the wake center recovery rate of the downstream wind turbine decreases, and the wake recovery rate drops most obviously under the full wake interference condition.

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Experimental Study on Wake Evolution of a 1.5 MW Wind Turbine in a Complex Terrain Wind Farm Based on LiDAR Measurements

Cited by 11 publications

References 37 publications

Fluctuating pressure gradients and corrugated surfaces effects on wind turbines power output

Fluctuating pressure gradients and corrugated surfaces effects on wind turbines power output

Application of 3D Digital Image Correlation Technique to Measurement of Wind Blade Properties from Coupon Test and Small-Sized-Blade Frequency Test

Experimental study on wake interference characteristics of horizontal-axis wind turbine

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