A Theoretical Method for Calculating the Aerodynamic Characteristics or Arbitrary Ejector-Jet-Flapped Wing: Theoretical Analysis.
Final technical rept.,
DOUGLAS AIRCRAFT CO LONG BEACH CALIF
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A theoretical method has been developed to determine the aerodynamic characteristics of ejector-jet-flapped wings in incompressible flow. The ejector-jet-flap is a high-lift concept conceived as a means of generating lift by using the jet-flap principle. The ejector, which consists of a primary jet directed in the gap formed by the upper and lower sections of the flap, provides, as the result of the entrainment of a secondary fluid, a trailing edge jet momentum normally in excess of that of the primary jet. In the present method the ejector system inside the flap is considered as an internal mechanism and the total momentum at the trailing edge is considered as a single thin jet of known momentum flux. Thus, the external aerodynamics of the ejector-jet-flap wing is similar to that of a wing with a jet-augmented flap with a suction or sink effect in the region of the flap hinge.