Abstract
The impact of increased inflow turbulence on the sound generation in forward- and backward-skewed low-pressure axial fans was investigated using a microphone array method. A turbulence grid was mounted at the inlet section to increase the inflow turbulence intensity. The inflow conditions were then characterized using a laser Doppler anemometer. A beamforming algorithm with deconvolution was applied for localizing sound sources on the fans under free and distorted inflow conditions. Sound spectra and sound maps showed that distorted inflow conditions had a profound impact on the sound emission and that the extent of this was strongly dependent on the fan blade design. In general, sound sources were found on the fan blade surfaces and the fan blade leading edges. After the installation of the turbulence grid, sound sources on the leading edges were amplified, especially in the case of the forward-skewed fan.
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