Study on small wind turbine icing and its performance

Shu, Lichun; Liang, Jing; Hu, Qin; Jiang, Xingliang; Xiaokai, Ren; Qiu, Gang

doi:10.1016/j.coldregions.2016.11.004

Cited by 54 publications

(32 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Typical applications of SWTs are in the electrification of rural or remote areas [10], as hybrid systems in combination with other energy sources, such as solar radiation or hydrogen [11], or in microgeneration to reduce carbon emissions [12]. Icing on SWTs has similar effects to icing on larger wind turbines, although due to their smaller size and different designs, the sensitivity to icing can be increased [13,14]. Typically, SWTs operate at comparatively low Reynolds numbers in the order of Re = 10 4 -10 5 [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Icing Penalties of an S826 Airfoil at Low Reynolds Numbers

et al. 2020

View full text Add to dashboard Cite

Most icing research focuses on the high Reynolds number regime and manned aviation. Information on icing at low Reynolds numbers, as it is encountered by wind turbines and unmanned aerial vehicles, is less available, and few experimental datasets exist that can be used for validation of numerical tools. This study investigated the aerodynamic performance degradation on an S826 airfoil with 3D-printed ice shapes at Reynolds numbers Re = 2 × 105, 4 × 105, and 6 × 105. Three ice geometries were obtained from icing wind tunnel experiments, and an additional three geometries were generated with LEWICE. Experimental measurements of lift, drag, and pressure on the clean and iced airfoils have been conducted in the low-speed wind tunnel at the Norwegian University of Science and Technology. The results showed that the icing performance penalty correlated to the complexity of the ice geometry. The experimental data were compared to computational fluid dynamics (CFD) simulations with the RANS solver FENSAP. Simulations were performed with two turbulence models (Spalart Allmaras and Menter’s k-ω SST). The simulation data showed good fidelity for the clean and streamlined icing cases but had limitations for complex ice shapes and stall.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Icing Penalties of an S826 Airfoil at Low Reynolds Numbers

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In experimental studies, wind tunnel tests are performed using artificial ice profiles on turbine blades to estimate the turbine performance losses. () Numerical studies,() which are carried out for various turbine blade profiles under similar icing conditions, predict power losses in the 20% to 35% range. The power production losses reported in the literature are in good agreement with the observed data from several wind farms.…”

Section: Introductionmentioning

confidence: 99%

Predictions of ice formations on wind turbine blades and power production losses due to icing

2019

View full text Add to dashboard Cite

Prediction of ice shapes on a wind turbine blade makes it possible to estimate the power production losses due to icing. Ice accretion on wind turbine blades is responsible for a significant increase in aerodynamic drag and decrease in aerodynamic lift and may even cause premature flow separation. All these events create power losses and the amount of power loss depends on the severity of icing and the turbine blade profile. The role of critical parameters such as wind speed, temperature, liquid water content on the ice shape, and size is analyzed using an ice accretion prediction methodology coupled with a blade element momentum tool. The predicted ice shapes on various airfoil profiles are validated against the available experimental and numerical data in the literature. The error in predicted rime and glime ice volumes and the maximum ice thicknesses varies between 3% and 25% in comparison with the experimental data depending on the ice type. The current study presents an efficient and accurate numerical methodology to perform an investigation for ice-induced power losses under various icing conditions on horizontal axis wind turbines. The novelty of the present work resides in a unified and coupled approach that deals with the ice accretion prediction and performance analysis of iced wind turbines. Sectional ice profiles are first predicted along the blade span, where the concurrence of both rime and glaze ice formations may be observed. The power loss is then evaluated under the varying ice profiles along the blade. It is shown that the tool developed may effectively be used in the prediction of power production losses of wind turbines at representative atmospheric icing conditions. KEYWORDS atmospheric icing, ice accretion, power losses, wind energy INTRODUCTIONIn recent years, producing energy from renewable energy sources is in great demand and installation of wind turbines in the world has been increasing steadily. Cold climate regions have the advantage of high wind speeds, high air density, and sparsely populated residential areas.However, wind turbines in these regions are usually exposed to atmospheric icing conditions, which have a detrimental effect on the performance.Formation of ice on wind turbine blades creates unwanted performance losses by changing blade aerodynamic characteristics and also reduces the lifetime of wind turbine components. 1,2 It is well-known that icing occurs when supercooled droplets in the atmosphere impinge on a surface such as a turbine blade. Liquid water content, temperature, droplet diameter, and wind speed are the basic factors affecting icing. Liquid water content mostly determines the severity of icing and its type. Wind speed and temperature also influence the type and intensity of ice. Droplets may either freeze instantly and form rime

show abstract

“…Consequently, continuous operation will cause damage to the hub and bearing of the wind turbine. If the wind turbine is shut down to remove ice, the number of hours the wind turbine runs will be greatly reduced [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Lightning Protection of Wind Turbine Blade with De-Icing Electrical Heating System

Zhao

Zhou

et al. 2020

Energies

View full text Add to dashboard Cite

In order to solve the problem of icing on the surface of wind turbine blade, a heating system that includes a carbon fiber net (CFN) and power cables is proposed recently. When lightning strikes at the blade with a de-icing heating system, the blade and its heating system are more easily damaged due to the overvoltage between the lightning protection system (LPS) of the blade and the heating system. In this paper, the models of a wind turbine blade with the de-icing heating system are established by Alternative Transients Program/Electromagnetic Transients Program (ATP–EMTP) and the accuracy of models is verified through an experiment. With these models, the influence of lightning current, surge protective devices (SPDs) and earthing resistance of wind turbine are analyzed by calculating the voltage between the down-conductor of the LPS and the heating system. The results show that the voltage is positively correlated with lightning current amplitude and negatively correlated with the front time of lightning current. SPDs are quite useful to reduce the voltage, and an optimal installation scheme of SPDs is obtained by simulation. It is noted that voltage decreases slightly with the increasing earthing resistance with the optimal installation scheme of SPDs.

show abstract

Study on small wind turbine icing and its performance

Cited by 54 publications

References 16 publications

Experimental and Numerical Icing Penalties of an S826 Airfoil at Low Reynolds Numbers

Experimental and Numerical Icing Penalties of an S826 Airfoil at Low Reynolds Numbers

Predictions of ice formations on wind turbine blades and power production losses due to icing

Numerical Study of Lightning Protection of Wind Turbine Blade with De-Icing Electrical Heating System

Contact Info

Product

Resources

About