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1

A vertical-axis rotor as the adjusting system of a horizontal axis wind turbine

Augustyn Marcin

Technical Transactions

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2020

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Vol. 117, iss. 1

art. no. e2020009

EN

The proposed self-adjusting mechanism consists of a carousel rotor with a vertical axis consisting of two kinematically connected flat blades. The torque of this rotor can change the position of the directing unit and additionally the position of the main propeller in order to direct the wind stream or save the main rotor when the wind is too strong. The theory, principles of operation, and the properties of the self-adjusting system were illustrated by formulas and graphs. Based on research conducted in a boundary layer wind tunnel, the values of the aerodynamic coefficients of the flat blades were determined, and then the power and propeller torque of the rotor were found as a function of the angle of wind attack. Acomputational procedure provides kinematical and force relations as well as the resulting torque diagrams of the rotor. An example of the use and the design structure of a self adjusting unit in the case of a horizontal axis wind turbine is presented.

PL

W artykule zaprezentowano nowatorskie rozwiązanie zespołu samonaprowadzania na kierunek wiatru turbiny wiatrowej o poziomej osi obrotu, składające się z dwułopatowego, karuzelowego wirnika o pionowej osi obrotu i dwupozycyjnego mechanizmu nastawczego. Na podstawie przeprowadzonych badań w tunelu aerodynamicznym wyznaczono wartości współczynników aerodynamicznych łopaty płaskiej wirnika dwułopatowego turbiny naprowadzającej, a ich wartości zobrazowano na wykresach. Przedstawiono procedurę obliczeniową mocy oraz momentu napędowego wirnika zespołu samonaprowadzania w zależności od kąta działania wiatru. Wyniki obliczeń pokazano na wykresach. Zaprezentowano budowę i zasadę działania turbiny naprowadzającej, a także propozycję wykorzystania jej jako zespołu samonaprowadzania na kierunek wiatru z jednoczesnym zabezpieczeniem wirnika głównego HAWT przed nadmiernymi obrotami przy silnym wietrze.

2

Numerical modeling of vertical axis wind turbine with air guides

Kołodziejczyk Krzysztof, Ptak Radosław, Korman Jakub

New Trends in Production Engineering

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2019

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Vol. 2, Iss. 1

589--595

EN

Currently, obtaining energy from renewable sources, as never before, it has become one of the most important areas, but at the same time challenges in human activities. This is the effect of many factors simultaneously, including because of the media trumpeted the greenhouse effect, the necessity of reducing CO2 emissions, shrinking natural resources, and thus the desire to protect their welfare including conservation (including natural resources) for future generations. The paper presents the results of preliminary numerical analyzes of work for vertical axis wind turbines equipped with air guides. The carried out analyzes indicate the potential possibility of using this type of construction in practice. The obtained power factor value is higher than in classic wind turbines with a vertical axis. The conducted analyzes also indicate the possibility of optimizing the proposed constructional solution in order to increase efficiency of obtaining energy from the wind.

3

Green energy from a hybrid PV panels and wind turbine farm in Lebanon

Nesser Bassel I., Soliman Mohamed Hassan, Pytel Krzysztof

New Trends in Production Engineering

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2019

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Vol. 2, Iss. 1

541--548

EN

The publication presents the results of analysis of green energy from a hybrid PV panels and wind turbine farm use in Lebanon. Electricity is one of the most critical problems in Lebanon. This publication presents an effective solution to this issue. It deals with the generation of green environment friendly electricity from photovoltaic (PV) panels and wind turbine. The genuine idea consists of placing these panels and turbines at the middle of the coastal highway since it is considered as a free land. The produced energy is fed directly to the off gird after being inverted using appropriate devices. The middle of the highway from Tyre to Sidon is considered to apply this research. The actual design consists of 15222 PV panels placed in pairs on a steel chassis among the entire 27300 m coastal distance, 2 meters wide and 7610 vertical axis wind turbines placed at a distance of 0.9 m away from each pair of PV panels. The total energy produced by the PV system is estimated to 7.4 GWh/y and 3.1 GWh/y at an average wind velocity of 4.04 m/s. In addition to its benefit from a free land, the produced energy is environment friendly since there is no carbon dioxide emission.