An Investigation of the Flow around a Permeable Three-dimensional Body on the Plate : 1st Report, The Pressure Distribution and the Estimation of the Drag

Measurements were made of the surface pressure around the permeable three-dimensional body having a various open area ratio set into a flat plate turbulent boundary layer, and flow patterns also have been observed by the oil film method and the smoke wire method. The value of open area ratio β were varied for 0≦β≦0.456 and the boundary layer characteristics were changed for two cases. The stagnation point on the front surface of the body was found to be depend on the value of boundary layer thickness. The strength of horse-shoe vortex was weakened with increasing the value of open area ratio. A tendency of the drag coefficient evaluated from the pressure difference acting on both front and rear permeable walls showed an abrupt change at a β of about 0.25.