Interaction between the atmospheric boundary layer and a stand-alone wind turbine in Gansu—Part II: Numerical analysis

Zheng, Zhi; Gao, Zhiteng; Li, Deshun; Li, Rennian; Li, Ye; Hu, Qiuhao; Hu, Wenrui

doi:10.1007/s11433-018-9214-1

Cited by 21 publications

(11 citation statements)

References 38 publications

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“…9, the fluid is subjected to excessive acceleration in the root area of the blades in the case of the turbine without the nacelle. Previous research has observed this phenomenon (Guo et al 2021;Zheng et al 2018).…”

Section: Axial Flow Behaviorsmentioning

confidence: 65%

Numerical Investigations on the Fluid Behavior in the Near Wake of an Experimental Wind Turbine Model in the Presence of the Nacelle

2023

JAFM

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Accurate predictions of the near wake of horizontal-axis wind turbines are critical in estimating and optimizing the energy production of wind farms. Consequently, accurate aerodynamic models of an isolated wind turbine are required. In this paper, the steady-state flow around an experimental horizontal-axis wind turbine (known as the MEXICO model) is investigated using full-geometry computational fluid dynamics (CFD) simulations. The simulations are performed using Reynolds-Averaged Navier-Stokes (RANS) equations in combination with the transitional k-kl-w turbulence model. The multiple reference frame (MRF) approach is used to allow the rotation of the blades. The impacts of the nacelle and blade rotation on the induction region and near wake are highlighted. Simulation cases under attached and detached flow conditions with and without the nacelle were compared to the detailed particle image velocimetry (PIV) measurements. The axial and radial flow behaviors at the induction region have been analyzed in detail. This study attempts to highlight the nacelle effects on the near wake flow and on numerical prediction accuracy under various conditions, as well as the possible reasons for these effects. According to simulation results, the rotation of blades dominates the near wake region, and including the nacelle geometry can improve both axial and radial flow prediction accuracy by up to 15% at high wind speeds. At low wind speeds, the nacelle effects can be ignored. The presence of the nacelle has also been shown to increase flow separation at the trailing edges of the blade airfoils, increasing both root and tip vorticities. Finally, small nacelle diameters are recommended to reduce flow separation on the blades and increase the average velocity downstream of the rotor, thereby optimizing wind farm output power.

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Section: Axial Flow Behaviorsmentioning

confidence: 65%

Numerical Investigations on the Fluid Behavior in the Near Wake of an Experimental Wind Turbine Model in the Presence of the Nacelle

2023

JAFM

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“…Then, the rotor, which is replaced with the actuator line model, is placed in the atmospheric boundary layer to simulate interaction between the atmospheric boundary layer and a standalong wind turbine. The detailed calculation results and analysis have been presented in another article [41].…”

Section: Numerical Simulationmentioning

confidence: 99%

Interaction between the atmospheric boundary layer and a standalone wind turbine in Gansu—Part I: Field measurement

Guo

et al. 2018

Sci. China Phys. Mech. Astron.

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Experiments and numerical simulations of the wake field behind a horizontal-axis wind turbine are carried out to investigate the interaction between the atmospheric boundary layer and a stand-alone wind turbine. The tested wind turbine (33 kW) has a rotor diameter of 14.8 m and hub height of 15.4 m. An anti-icing digital Sonic wind meter, an atmospheric pressure sensor, and a temperature and humidity sensor are installed in the upstream wind measurement mast. Wake velocity is measured by three US CSAT3 ultrasonic anemometers. To reflect the characteristics of the whole flow field, numerical simulations are performed through large eddy simulation (LES) and with the actuator line model. The experimental results show that the axial velocity deficit rate ranges from 32.18% to 63.22% at the three measuring points. Meanwhile, the time-frequency characteristics of the axial velocities at the left and right measuring points are different. Moreover, the average axial and lateral velocity deficit of the right measuring point is greater than that of the left measuring point. The turbulent kinetic energy (TKE) at the middle and right measuring points exhibit a periodic variation, and the vortex sheet-pass frequency is mostly similar to the rotational frequency of the rotor. However, this feature is not obvious for the left measuring point. Meanwhile, the power spectra of the vertical velocity fluctuation show the slope of −1, and those of lateral and axial velocity fluctuations show slopes of −1 and −5/3, respectively. However, the inertial subranges of axial velocity fluctuation at the left, middle, and right measuring points occur at 4, 7, and 7 Hz, respectively. The above conclusion fully illustrates the asymmetry of the left and right measuring points. The experimental data and numerical simulation results collectively indicate that the wake is deflected to the right under the influence of lateral force. Therefore, wake asymmetry can be mainly attributed to the lateral force exerted by the wind turbine on the fluid.

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“…Structural equation model [6][7][8][9] can realize the analysis of the relationship between multiple variables, which is different from the traditional linear regression model. The linear programming model ignores the relationship between independent variables.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Factors Influencing the Satisfaction of College Users on Logistics Services under the Structural Equation Model: Example of Jingdong Logistics in China

2021

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In this paper, the structural equation model is used to investigate the factors that affect the satisfaction of college students with Jingdong (JD) logistics. Based on the Swedish customer satisfaction index (SCSI) model and the American customer satisfaction index (ACSI) model, combined with their own actual needs, the model of college students’ satisfaction with JD Logistics is redefined. In this way, the scale indicators of the questionnaire survey are set. Combined with the research and empirical analysis of relevant literature, the initial model hypothesis was constructed, and six path hypotheses were proposed. The reliability and validity analysis confirmed that the questionnaire scale had high reliability and structural validity, and the structural equation model is also carried out. The fitting degree test confirmed that the structural equation hypothesis model has a high degree of fit, and verified the hypothesis established in the article, and finally put forward some countermeasures and suggestions for improving the service system of JD Logistics.

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Interaction between the atmospheric boundary layer and a stand-alone wind turbine in Gansu—Part II: Numerical analysis

Cited by 21 publications

References 38 publications

Numerical Investigations on the Fluid Behavior in the Near Wake of an Experimental Wind Turbine Model in the Presence of the Nacelle

Numerical Investigations on the Fluid Behavior in the Near Wake of an Experimental Wind Turbine Model in the Presence of the Nacelle

Interaction between the atmospheric boundary layer and a standalone wind turbine in Gansu—Part I: Field measurement

A Study on the Factors Influencing the Satisfaction of College Users on Logistics Services under the Structural Equation Model: Example of Jingdong Logistics in China

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