A bowed blade modeling method based on natural spline is proposed.

Bowed blade technique is applied to micro axial fans and the numerical investigation is implemented on its aerodynamic performance of the different types of bowed blades.

For a better and complete understanding of bowed blade s action in diffusion cascade,a numerical investigation on flow field of bowed stators was carried out through keeping conditions other than aspect ratio unchanged.

Aerodynamic analysis was carried out on a flectional cascade.

Correctly selected bowed blade can reduce the energy loss and improve the corner flow.

It is pointed out that the positively bowed blade under the low Reynolds number condition is a good choice from the view of losses reduction and efficiency improvement according to the field analyzing for the different bowed blades under the low Reynolds number condition.

The exit flow fields of cascades with straight and positively bowed blades, with bowing angles of +10°，+20° and +30°, respectively，are measured by using a micro-five-hole probe.

Compared with the original design,the modified design changed many geometry parameters,including adopted optimizing meridional endwall profile,positively curved blade,aft-loading airfoil and negative incidence angle at the leading edge,so the incidence characteristics of these two designs differ significantly.

The flow field structure and loss distribution of straight and positively curved blade under the condition of different incidences, which includes 0°、±10°、±20° and ±30°, at high Mach number are studied systematically.

The charactetistics of compressor cascades with curved blades at different inlet boundary layers are studied in detail, and experimental results show that with the thickening of the inlet boundary layer, the secondary losses at the cascade ends increase, the overturning of the fluids near the two ends is enhanced.