비정렬 중첩 격자기법을 이용한 Yaw각을 갖는 풍력 터빈의 비정상 공력 특성 해석

Abstract

This paper presents the results of Computational Fluid Dynamics (CFD) simulations of the National Renewable Energy Laboratory (NREL) Phase VI horizontal axis wind turbine rotor under yawed flow conditions. The incompressible Reynolds-averaged Navier-Stokes flow solver demonstrates the greatest potential to predict is used for the computations. Unstructured overset mesh technique was adopted for the simulation the unsteady time accurate wind turbine motion. Calculations were done for a range of wind conditions from 7m/s to 25m/s where the flow conditions raged from attached flow to massively separated flow. Results from the computations for these cases showed the overall best agreement with the experimental measurements. All computations are performed as rotor-only computations, excluding tower and nacelle. This paper showed computed results and measurements in the form of aerodynamic coefficients and pressure distribution. The continuous spanwise force distributions are compared with measurements, along with the pressure distributions at five spanwise positions.