Experimental results show that a thin cylinder mounted near solid flow boundaries is capable of suppressing turbulent boundary-layer separation caused by adverse pressure gradients in subsonic flows. The cylinder is located parallel to the wall, normal to the flow, and several boundary-layer thicknesses away from the surface. Flowfield measurements suggest that the cylinder-wake/wall-boundary-layer interaction is responsible for the effects found. The ranges of geometrical and boundary-layer variables leading to improved performance were established for axisymmetric diffusers equipped with such devices. Empirical design rules are given. A comparison with vortex generators is made.
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Sajben et al. (1977) studied this question.
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