Based on the non-stationary characteristic of natural wind, three kinds of dynamic inflow functions are fitted based on the actual operating conditions of an S-wing horizontal axis wind turbine, and the non-stationary calculation models under different inflow are established to study the effects of dynamic inflow on the wake aerodynamic noise and blade pressure pulsation. The results show that： the sound pressure level at each octave is higher than that at constant inflow under dynamic inflow, and the magnitude is as follows： disturbance inflow >gradient inflow > gust inflow > constant inflow; the sensitivity of dynamic inflow to sound pressure level increases with the increase of octave order; the sensitivity of dynamic inflow to sound pressure level increases with the increase of octave order. The sound pressure level difference between dynamic inflow and constant inflow along the axial direction gradually increases; the peak pressure pulsation of gust inflow, gradual inflow and disturbance inflow increases in turn, which is also the reason for the same size law of sound pressure level. By analyzing the influence of the inflow condition on the blade sound field distribution and change law, it provides some theoretical and reference basis for future large blade noise assessment and noise reduction design.
Key words
wind turbines /
acoustic noise measurement /
vorticity /
pressure pulsation /
dynamic inflow
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