NUMERICAL AND ANALYTICAL STUDY OF WIND TURBINE WAKES IN YAWED CONDITION

Abstract

A new analytical wake model is proposed to predict the wake deflection, mean velocity, and turbulence intensity in the wake flow of yawed wind turbines. Firstly, two kinds of operating condition with different thrust coefficients under two types of inflow with different ambient turbulence intensity are simulated for two yaw angles by the Reynolds stress model. The wake deflection, mean velocity and turbulence intensity in the wakes are systematically investigated. A new wake deflection model is then proposed to analytically predict the wake center trajectory in the yawed condition. Finally, the proposed wake deflection model is incorporated in the Gaussian-based wake model. The wake deflection, velocity deficit and added turbulence intensity in the wake predicted by the proposed model show good agreement with the experimental data and numerical results.