An Experimental Investigation of the Effect of Electrically Induced Controlled Frequency Perturbations on Boundary Layer Transition

摘要

An experimental investigation was conducted to determine the effects of corona discharge on boundary-layer transition. A flat plate was mounted in a low-turbulence wind tunnel. The location of transition was determined using a near-surface impact pressure probe. Boundary-layer excitation was accomplished by suspending a series of corona wires parallel to the plate outside the boundary layer. It was found that, under certain conditions, the transition point could be moved downstream upon application of a steady potential to the wires. Superposition of a pulsating potential did not influence the results over a wide range of pulsation frequency. (Author)