Use of the Coanda effect for jet deflection and vertical lift with multiple-flat-plate and curved-plate deflection surfaces

Uwe H. Von Glahn
naca-tn-4377
Sep 1958


The ratios of lift and axial thrust to undeflected thrust of nozzle-deflection-plate configurations using the Coanda effect for obtaining jet deflection and lift were evaluated from force measurements. Pressure distributions were also obtained over the surfaces of the deflection plates. The convergent nozzles used in the study were of rectangular cross section with exit heights ranging from 0.5 to 2.0 inches. The jet-deflection plates used included configurations made up of two, three, six, and nine flat plates and several curved plates with various radii of curvature, all having side plates equal in height to the nozzle. The nozzles discharged into quiescent air over a range of pressure ratios from 1.5 to 3.0.

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