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Blades interaction and non-stationarity of flow in vertical-axial wind turbines

Rozhkova Ludmila, Krenicky Tibor, Kuznetsov Eduard, Nahornyi Volodymyr

Management Systems in Production Engineering

2021

nr 4 (29)

280--286

Until recently, horizontal-axial wind turbines with blades having a wing profile occupied a predominant position in the world wind energy market. But currently, vertical-axial wind units are of increasing interest and this is understandable from the point of view of their important features as: no requirements for the orientation of the wind turbine to the wind, the possibility of placing electrical and other equipment on the ground, no requirements for changes of blade chord installation angle along its length. The article discusses the aerodynamics of the vertical-axis wind turbines: the range of changes of angles of incoming flow attack on the blade, the dynamics of changes in the magnitude of the absolute speed of flow of the blade on a circular trajectory of its movement depending on the turbine rapidity, and also obtained in experiments interaction effect of the blades in the rotor. The experiments were carried out on wind turbines with original blades (basic version), which were designed to eliminate the shortcomings of low-speed rotors Savonius (low coefficient of use of wind energy) and high-speed rotors Darrieus (lack of self-start).

An assessment the wind potential energy as a generator of electrical energy in the coastal area of southern Iraq

Hadi Firas A., Abdulsada Al-Knani Basim, Abdulwahab Rawnak Adel

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2020

Vol. 29, No. 1

37--53

Renewable energies have the potential to provide relatively clean energy, mostly for domestic energy. Wind power generation is expected to rise in the near future and has grown exponentially over the past decade in many countries. The most important parameter that must be taken into consideration when designing and studying wind power conversion systems is the wind speed. Probability density functions (PDF) such as Weibull is often used in wind speed and wind power analyses. This research presents an assessment of wind power based on the Weibull distribution statistics in the coastal of southern Iraq at Basrah province. Wind speed data for the study site were obtained from NASA at a height of 50 m for the period 1979–2016 with a time interval of 10 min. The data at a height of 50 m were extrapolated using the power law in order to estimate the wind speed at new heights: 30, 70 and 100 m. The different parameters of the Weibull function as well as the daily and monthly wind speeds, mean, variance and potential energy at four altitudes were estimated and analysed using Windographer software. Results indicate that the maximum wind speed at 100 m is 6.4 m·s–1, giving an average power density of 298 W·m–2, which indicates that the location of the study has marginal and useless potential for installing large wind turbines.

Potencjał produkcji energii elektrycznej przez turbinę wiatrową w zależności od lokalizacji i warunków wietrzności

Nowacka A., Wygoda M.

Górnictwo Odkrywkowe

2015

R. 56, nr 1

71--76

W ramach projektu ENERGYREGION zostały przeprowadzone badania potencjału energetycznego wiatru dla małych i średnich turbin wiatrowych w wybranych lokalizacjach na Dolnym Śląsku. W tym celu na masztach pomiarowych zostały zainstalowane czujniki prędkości wiatru. Pomiary wiatru były wykonywane przez okres pełnego roku. Na podstawie uzyskanych danych przeanalizowano zależność potencjału energii od szorstkości terenu i prędkości wiatru mierzonej na różnych wysokościach. W publikacji przedstawiono opracowany autorski program „PowerCalculator”, który umożliwia oszacowanie wielkości produkowanej energii elektrycznej przez turbinę, z dostępnego potencjału energii wiatru dla zmiennych parametrów szorstkości terenu i prędkości wiatru mierzonego na różnych wysokościach.

The wind energy potential studies for small and medium-sized wind turbines have been carried out within ENERGYREGION project. For this purpose, measuring masts at selected locations in the Lower Silesia were erected and wind measurements were realized for a full year. Based on the data from measurement sensors, the dependence of the wind energy potential with respect to the terrain roughness and wind speed measured at different heights has been presented. The “PowerCalculator” software has been developed to calculate the wind energy potential for varying values of parameters such as terrain roughness and wind speed at different heights, its applications presented in this paper.