Abstract
The drag coefficient of a peripheral jet GEM depends considerably upon the ratio of free stream dynamic pressure to mean cushion pressure. In particular, the drag is significantly less than that evaluated by Chaplin's assumption (parasite drag+ momentum drag). Previously we clarified the existence of a horse-shoe vortex surrounding a GEM model from the bottom of which the air is supplied, and proved the generating mechanism of the interference thrust. This paper presents a result of preliminary experiments about an intake effect on the GEM external drag. A built-in-fan model (model 2) is tested in a wind tunnel, and the aerodynamic performance of this model is compared with one for previous model which has no intake (model 1). The configuration of model 2 is selected so that the separation of the momentum drag from the external drag may be as reasonable as possible. Both model are hemispherical.
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