S051032 Flow Field Analysis of Twin Rotor Cross Flow Wind Turbine by OpenFOAM

Abstract

Performance of a pair of tandem arranged close Cross Flow Wind Turbines (Twin Rotor Cross Flow Wind Turbine, TRCFWT), and of Cross Flow Wind Turbine (Single Rotor Cross Flow Wind Turbine, SRCFWT) investigate by OpenFOAM CFD software. Rotation of the rotors at TRCFWT has forward and backward mode and complex mode. Forward mode is that the rotor peripheral velocity direction and the main flow direction is the same at the minimum clearance between the rotors. In contrast to this, backward mode is that the direction of these is reverse. Complex mode is that a pair of rotors rotates in the same direction. Calculation of the TRCFWT at forward and backward mode and the SRCFWT are conducted under the conditions of the rotors of the same form, uniform flow velocity of 4 m/s, flow angle of 0 degree, and G/D of 0.230(G: the distance between the rotors, D: the rotor diameter, except for the SRCFWT). The calculation result suggests that the maximum power coefficient of forward and backward mode is 1.16 times and 1.05 times that of the SRCFWT, respectively. Furthermore, operating tip speed ratio of forward and backward mode is 1.10 times that of the SRCFWT.