Abstract
Wind power is one of the tremendous potential on renewable energies. The problem due to low frequency (20-200 HZ) generated by operation is, however, quite difficult to spread expensively. In this study, the benchmarks for the simulations of flow and acoustic fields were performed on NREL Phase VI. The coupling analysis was integrated with RANS-based turbulence models and FW-H acoustic model under different boundary conditions of wind profiles, 7 m/s and 15 m/s. The results presented that the simulations of flow and acoustic fields have good agreements with experimental data. Based on the process of the simulation on NREL Phase VI(S809) and small scale vertical axis wind turbine(NACA0021), the INER 25 kW turbine system was employed for the prediction of the noise distribution focusing on low frequency. The simulation results showed that the peak amplitude in decibels is inversely proportional to the distance increasing, whereas the peak one is proportional to the wind speed. The efforts and experiences of this study will be able to assist the master plan in improving the design of wind turbine system on noise problem.