Abstract
The turbulent velocity components (u, v) at 11 points in a reciprocating oscillatory turbulent flow have been recorded simultaneously by a set of eleven X-type hotwire probes located in a plane perpendicular to the mean flow. Using the conditional sampling technique and a new method of data analysis for the inverse estimation of flow field called the " virtual plate/load and mascon model", we reconstructed the quasi-instantaneous three dimensional image of the large-scale structure of turbulence (expressed in terms of the velocity components u, v, w). The image has been further clarified by the perspective representations visualized by the computer technique in terms of time-lines and streak-lines of fluid particle tracer. This may be the first proof of the instantaneous coherent turbulence structure directly derived experimentally from velocity measurement by probes such hot-wires and LDV.
