The noise distribution and dissemination law were studied in sound field of the S series new airfoil horizontal axis wind turbine near wake by acoustic array. Using the vibration and noise testing software (B&K) of Denmark in wind tunnel opening section, the blade downstream noise of the S Series airfoil horizontal axis wind turbine were tested ensuring wind speed at the rate of 10 m/s and different tip speed ratios. The maximum sound power level (SPL) was obtained by analyzing spectra under different tip speed ratio of the same section of wind turbine downstream. The results showed that the noise distribution law of maximum sound pressure level emerged in turn three strong pressure fluctuation change regions from center to radius direction, which are the test center, the center vortex and the tip vortex. The sound pressure level in these three regions emerged as sharp peak. At different cross section of the same tip speed ratio, the noise dissemination variation of wind turbine near wake is that the region radius of center vortex and tip vortex increase and constant migrate along the x axis positive direction away from the test section of the wind turbine.
