AN EXPERIMENTAL-STUDY OF A 2-DIMENSIONAL PLANE TURBULENT WALL-JET

Laser-Doppler measurements were conducted in a plane turbulent wall je t at a Reynolds number based on inlet velocity, Re-0, of 9600. The ini tial development as well as the fully developed flow was studied. Spec ial attention was given to the near-wall region, including the use of small measuring volumes and the application of specific near-wall data corrections, so that wall sheer stresses were determined directly fro m the mean velocity gradient at the wail using only data below y(+) = 4. It was possible to resolve the inner peak in the streamwise turbule nce intensity as well as the inner (negative) peak in the shear stress . Limiting values of (u')(+) and uv(+) were determined. Turbulence dat a from the outer region of the flow were compared to earlier hot wire measurements and large differences in the normal turbulence intensity and the shear stress were found. These differences can be attributed t o high turbulence intensity effects on the hot-wires.