Abstract
In this paper, we made clear the effects of the blade geometry on the performances and the flow and noise characteristics of a jet fan. The fan with three-dimensional blade, which has the twisted blades to the span direction, is compared to that with two-dimensional blade ( conventional type fan). It was cleared that the performances of aerodynamics and noise are improved with the three-dimensional type fan. The flow characteristics are mainly improved near the hub in front and rear rotors. Especially the turbulent level is decreased with three-dimensional type fan in front and rear rotor. It is proposed the prediction of the fan noise of the jet fan.
