| Abstract [eng] |
In this paper, a deep aerodynamic analysis is made about vertical axis wind turbines. Effective factors on wind turbine power curve parameters (2nd section) and optimal aerodynamic profiles together with wind turbines geometrical properties (3rd section) are presented. In a calculation results, a designed vertical axis wind turbine’s power curve is compared to 4 MW wind turbine, an example taken from the wind industry market. The main tasks and results are these: Vertical axis wind turbine optimal blade count and solidity parameter. An average wind speed comparison between seashore and 104 km distance, in the sea territory of the Republic of Lithuania. A roughness effect of a blade surface on aerodynamic characteristics are estimated, as well as an environment temperature impact, aerodynamic shading of tower and supporting construction, and computational mesh size influence. There is a computational scheme presented, allowing to analyse the performance of wind turbine due to various geometry parameters. Effective “TSR” values are estimated, 159 different aerodynamic profiles are compared. Four best profiles are picked for blade modelling, aerodynamic characteristics are compared. Aerodynamic parameters of wind turbine and blade loads are calculated in a wind speed range of 5–16 m/s. The most important received results are these: 1. Optimised power curve of blade’s fixed angle position, power increment– 19.5 %. 2. Optimised power curve of blade’s chord length, power increment – 45 %. 3. At wind speed interval of 8–13 m/s, average turbines efficiency – 34 %. 4. 4 MW horizontal axis wind turbine “Vestas”, generated wind energy in the sea over the last 30 years equals to 471 GWh. In comparison, a 4 MW calculated vertical axis wind turbine reaches 425 GWh. The overall generated energy difference is 9.8 %. |
