NUMERICAL SIMULATION OF AERODYNAMIC NOISE FROM HAWT

초록

This study presents results of numerical prediction of aerodynamic and noise characteristics of Horizontal Axis Wind Turbine (HAWT) rotor using commercial CFD code CFX ANSYS and in-house noise prediction code based on Ffowcs Williams-Hawkins equations. The flow field around 3-dimensional rotor is simulated by solving Reynolds-Averaged Navier-Stokes (RANS) equation with use of Shear Stress Transport (SST) turbulence model. The results of CFD simulations are compared and validated against the test results in terms of pressure distributions on the blade surface, torque and power coefficients. The velocity and pressure fields around rotating blades of the HAWT obtained from the URANS simulation are used as input values for in-house code for prediction of sound pressure levelsatspecified locations.The in-house acoustics code is validated by comparing numerical prediction results with experimental test results. The HAWT rotor noise signatures are computed for different operation regimes associated with different flow conditions using both original non-permeable surface and permeable surface formulations.