The performance of a tandem cascade in a cascade wind-tunnel is discussed and the characteristics of a given cascade are presented (a) without end wall suction and (b) with suction, in order to produce two-dimensionality as closely as possible. Necessary criteria for the existence of two-dimensional conditions are stated. A discussion is given of the development of the boundary layer on the second blade as affected by the wake based on hot wire anemometer investigations. In addition, a separate experiment is described in which a wake is allowed to impinge on a flat plate, subject to an adverse pressure gradient. From both experiments the influence of the size of slot between the tandem aerofoils is assessed.
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