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Abstract
Estimation of turbulent noise level with L-weighting and A-weighting functions was proposed to a centrifugal fan without scroll casing. The validity of these formulae was examined experimentally in respect to the effects of parameters ; inlet/outlet area ratio of impeller and five fan types. The agreement between the measured and the predicted values of the width of wake and the mean relative velocity was satisfactory. Moreover the experimental values of the overall turbulent noise with L-weighting and A-weighting functions agreed well with the predicted values. Finally, the effects of slip factor and the inlet/outlet area ratio of the impeller on the relative velocity, the width of wake, the sound pressure level and the specific noise level are shown.
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