Optimal choice of the geometric shape rotor blade wind turbine using the numerical method

Abstract

To increase the energy efficiency of wind turbines, it is necessary to optimize and improve the shape and size of power elements. In this work, in order to improve the output energy indicators, as well as increase the lifting force, a combined blade in the form of a rotating cylinder and a fixed blade was created and numerically studied. The novelty of the work lies in obtaining the results of the influence of a fixed angle of inclination of the blade on the overall aerodynamic characteristics of the entire combined blade at wind speeds from 3 to 12 m/s. Based on three-dimensional modeling, 4 variants of the combined blade with different angles of location are designed. Three-dimensional patterns of the distribution of velocity vectors and pressure fields are obtained. Linear graphs of the dependence of aerodynamic coefficients on the Reynolds number are shown. It was found that at an angle of 0 degrees, the combined blade has a maximum lift coefficient of 10 and a minimum drag coefficient of 4.5 at Reynolds 1·104. The numerical results obtained will be useful in the development of wind power plants with combined blades operating on the basis of Magnus.