On accurately measuring statistics associated with small-scale structure in turbulent boundary layers using hot-wire probes

Abstract

Spanwise vorticity measurements have been performed in zero-pressure-gradient boundary layers over the range 1010 < Rθ < 4850 (Rθ= U∞ θ/v, where U∞ is the free-stream velocity and 6 is the momentum deficit thickness) using a four-wire probe. In addition, experiments quantifying the spatial and temporal resolution required to obtain an accurate statistical representation of the small-scale structure of wall-bounded turbulence were performed. Furthermore, a thorough investigation of statistical convergence for a variety of fluctuating quantities was performed. Comparisons with earlier high-resolution studies indicate that the maximum value of ú/ur increases with increasing Reynolds number over..