Patent ID: 6267331
Filing Date: 2001-07-31
Classification: B64C,Y02T

Abstract:
A method for inhibiting dynamic stall of an airfoil having a leading edge and a trailing edge that define a chord therebetween, as the airfoil executes a pitching motion at a frequency of airfoil oscillation, comprising a step selected from the group consisting of:(a) causing a fluid to flow through at least one location on the airfoil within about one quarter of the chord from the leading edge, said flow being with a zero net mass flux;(b) causing a fluid to flow through at least one location on the airfoil within about one quarter of the chord from the leading edge, said flow being with a non-zero net mass flux and modulated at a first frequency of oscillatory forcing described by a Strouhal ratio greater than about one; and(c) causing said fluid to flow through at least one location on the airfoil beyond about one quarter of the chord from the leading edge.