An experimental investigation of mean flow field behind perforated plates on a flat surface

Abstract

The wind tunnel experiments were conducted over a solid/perforated plate with a long splitter plate in its plane of symmetry. The effect of varied level of perforation of the normal plate on the behaviour of two dimensional separation bubble was studied. The mean velocity and surface mean pressure distributions were also measured after preliminary flow visualization studies. The normal plate perforation levels used are 0%, 10%, 20%, 30%, 40% and 50%. The Reynolds number based on step height was varied from 4 103 to 1.2 104. Mean pressures were found to be strongly dependent on perforation level of the normal plate. The shape and size of the bubble vary with different perforated normal plate that is to say, the bubble gels reduced both in height and length upto 30% perforation level. For higher perforation of the normal plate, the bubble is completely swept out. 2002 Taylor & Francis Group, LLC.