Surface Pressure and Wall Shear Stress Measurements on a Wall Mounted Cylinder

The paper reports on steady and unsteady surface pressure as well as mean and fluctuating wall shear stress measurements of high spatial resolution on and in the vicinity of a wall mounted finite circular cylinder with an height to diameter ratio of H/D=2. All measurements were performed at a Reynolds number of Re-D=2.10(5) based on the cylinder diameter. The pressure measurements were conducted using a total of up to 179 simultaneously operated pressure tappings with piezoresistive pressure transducers. As a result, the complete instantaneous pressure distribution in the cylinder wake could be obtained. For the wall shear stress measurements, newly developed delta surface hot-wire probes, an enhancement of the standard surface hot-wire, were used. The probe design, its calibration procedure and the measuring principle are discussed as well.