Abstract: The characteristics of reversible ventilation of axial fan is analysed in the paper. In accordance with the theory of flow around the airfoil a new type airfoil---- “S” shaped airfoil with double circles is presented and experimentized in wind tunnel. The experimental results have shown that characteristics of new type airfoil in reversal ventilation are the same as that in normal ventilation. If the impeller of fan designed with new airfoil is rotated in contrary direction, the volume flow, pressure and effecence of fan would be the same as that in normal direction, hence the effect of reversal ventilation would be same as that in normal direction, hence the now type airfoil presented in the paper provides a basis for construction a new type reversible fn which can alternate the flow direction by simply reversing the rotating of motor with much better characteristics than that of existing reversible fans.

Key words: 可逆性, 翼形, 轴流式通风机