DOI: 10.1615/TSFP5
EFFECTS OF REYNOLDS NUMBER AND ADVERSE PRESSURE GRADIENT ON A TURBULENT BOUNDARY LAYER DEVELOPING ON A ROUGH SURFACE
要約
A detailed experimental study of turbulent boundary
layers developing over rough surfaces and submitted to both zero and adverse pressure gradient was undertaken. Two surface roughness characterized by distributed random
elements have been chosen. The boundary layer was probed
with a single hot wire in order to get mean and turbulent
quantities. Skin friction coefficient was obtained from the semi-logarithmic profiles of the mean velocity, using laws of the wall.
The emphasis of this work is on the dependency of the
"equivalent sand roughness" upon the pressure gradient and the Reynolds number. It was pointed out that both the
roughness topology and the nature of flow had to be taken
into account when the equivalent sand roughness concept
was needed.