Abstract
A inviscid-viscous interaction calculation method for propeller open characteristics at steady condition is presented. The method consists of the non-linear steady lifting surface calculation, the quasi-three-dimensional boundary layer calculation for rotaing blades including three-dimensional and rotation effects and the pressure calculation for two-dimensional wing with wake. Major viscous effects for wing, thickned wing, deformed camber, change in attack angle and existence of wake, are all taken into consideration. Viscous effects on propeller open characteristics of three model propellers having different chordwise load distributions are calculated. Although the results show lower values than experimental values, it is verified that the present method can estimate viscous effects with accuracy. The three-dimensional effects of propeller boundary layers have significant influence on inviscid-viscous interaction problem. It is concluded that the problem of inviscid-viscous interaction of propeller open characteristics should be treated with the thick wing theory not with the thin wing approximation.
