Scanning laser anemometer measurements of a forced cylinder wake

Abstract

It is demonstrated that a scanning laser anemometer is capable of measuring rapid and randomly occurring flow events. Mean and instantaneous velocity profiles in the near wake of a cylinder at Reynolds number of 155 are shown together with spatial correlations. In addition, the scanning laser anemometer has been used to show that the mean velocity defect behind the cylinder can be substantially reduced, when the wake is disturbed by unsteady forcing with a line of small pulsating jets emanating from the trailing edge of the cylinder.