Abstract
This paper presents an experimental investigation of the deflection angle and the characteristics of a two-dimentional turbulent free jet issued into a still air after deflected by a one-side flap. The flap was fitted up at the lower edge of a rectangular nozzle of aspect ratio10. The center flow of the jet was confired to be two-dimensional. The velocity and static pressure distributions and the lines of the maximum velocity were measured for various flap widths and flap angles. It was found that the deflection angle of a jet is equal to the flap angle when the flap width exceeds 2.5 times the nozzle width and the decay of the maximum velocity and the spread of the deflected jet are different from those of a free jet in the absence of the flap.
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