The Comparison between the Longitudinal Correlation and the Time Correlation in a Turbulent Flow

Abstract

Some preliminary applications of high speed computing to the analysis of experimental data on turbulence are reported. A time correlation curve is determined from a recording of velocity fluctuations measured with a single hot-wire anemometer. The shape of the time correlation curve differs from the shape of the longitudinal correlation curve measured in the same fluid flow. One must, therefore, be cautious in reaching conclusions from experiments based on the assumption that time and space spectra of turbulence are identical. A more extensive study of the relation between time and space characteristics of turbulence is in process.