An innovative method for determining the unsteady shear-layer reattachment location downstream of a flow obstacle using a surface-mounted hot-film array is proposed. The method uses strong levels of anticorrelation between adjacent probes across short time windows to determine the unsteady location of shear-layer reattachment. The resulting time histories for the unsteady reattachment location on the airfoil compared well with the mean reattachment location and the estimated reattachment zone determined from surface oil-flow visualization. Similar trends were observed in the probability density function of the unsteady reattachment location between the current investigation and PIV-derived reattachment data. Implementation of this method to the separation bubble downstream of a simple geometry, like a backward-facing step, would assist in further development of this method.
ASJC Scopus subject areas
- Aerospace Engineering