Comparison of performance of axial fans with straight and swept blades

Noxiousness of the noise generated by fans applied in different heat power and ventilation systems increase the tendency to develop new fans with the lower level of noise saving the same performance. In this paper the results of investigation of two axial fans WOO-63 with different rotor blades: straight and forward swept are given. This investigation shows that the noise of the fan with swept blades is about 6 dB lower than the noise of the fan with straight blades, but performance of the fan with swept blades remains as for the fan with straight blades.