抄録
Flow behaviour around bluff bodies near a flat plate is investigated in order to yield some basic information on the effects of a flat plate. Experiments have been carried out for rectangular cylinders with different width-to-height ratios B/H and the cylinders are positioned progressively close to the plane. At Reynolds numbers of 100-300, flow is observed by means of the electrolytic-precipitation method in a towing water tank. Vortex shedding and the wake structure are revealed at various gap-to-height ratios. At a large value of S/H, a regular street of vortices is observed, whereas when both values of B/H and S/H are small, only a single row of vortices is formed and at Reynolds number of 115, the wake is seen to break down after about 200H/Usec.
