Doppler Lidar Investigations of Wind Turbine Near-Wakes and LES Modeling with New Porous Disc Approach

Many bottom-mounted offshore wind farms are currently planned for the coastal areas of Japan, in which speeds 6.0–10.0 m/s extremely common. The impact such is very relevant realization farms. In evaluating feasibility these farms, therefore, strict evaluation at important. present study, airflow characteristics 2 MW-class downwind turbine wake flows were first investigated using a vertically profiling remote sensing measurement device (lidar). turbines used this study installed point where sea just front turbines. A ground-based continuous-wave (CW) conically scanning lidar system (“ZephIR ZX300”) was used. Focusing on near-wakes, detailed behaviors considered. We found that influence wake, is, loss (wind velocity deficit), large speed range m/s, and almost constant (6.0–10.0 m/s). It additionally shown results correspond to distribution thrust coefficient turbine. proposed computational fluid dynamics (CFD) porous disk (PD) model as an intermediate method between engineering models CFD models. Based above observations, reproducing behavior wakes with PD we developed set m/s. Targeting vertical near-wake region acquired “ZephIR ZX300”, tuned parameters (CRC = 2.5). practice, when mean deficit due wakes, applying swept area effective. That can reproduce average area.