Accession Number : AD0410027

Title :   TEST RESULTS OF A TWO-DIMENSIONAL PLENUM CHAMBER GROUND EFFECT MACHINE OVER A LIQUID SURFACE

Corporate Author : DAVID TAYLOR MODEL BASIN WASHINGTON DC

Personal Author(s) : Tinajero, Anibal A.

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Report Date : JUN 1963

Pagination or Media Count : 82

Abstract : A two-dimensional plenum-chamber GEM with a trailing-edge flap was tested over a liquid surface. The discharge coefficient was determined for the following parameters: ratio of intake to escape area, ratio of planform area to intake area, hover height, planform loading, flap angle, and distance from the trailing edge of the falp to the liquid. The test equipment consisted of a narrow rectangular tank with transparent sides. One end was enclosed with wood; the other was open to allow air to flow freely through a vertical nozzle. For simulation of flight over a liquid surface, the open end required a barrier to retain the water. The model used for representing the GEM consisted of a board with a flap at one end and an inlet diffuser nozzle at the other end. The flap setting could be varied over a wide range of angles, and the size of the inlet was controlled by inserting different nozzle blocks. The results indicate that the discharge coefficient is a function of intake area, flap angle, and planform loading. The values for discharge coefficients were found to vary consider ably with planform loading. Discharge coefficient values should be considered only approximate, because of model size. These results do show a qualitative behavior of a plenum chamber GEM in the over-liquid hovering condition.

Descriptors :   *BOUNDARY LAYER FLOW, *GROUND EFFECT MACHINES, SETTING(ADJUSTING), FLAPS(CONTROL SURFACES), EJECTION, DUCT INLETS, MODEL BASINS, TRAILING EDGES, DETERMINATION, HOVERING

Subject Categories : FLUID MECHANICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE

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