Two Turbulent Shear Flows. I. A Plane Jet. II. A Radial Jet

摘要

Results from hot-wire measurements in a plane turbulent jet and a radial turbulent jet are reported. The plane jet was found to be approximately self-preserving sufficiently far downstream, where measurements of the intermittency and data for calculating the energy balance of the turbulent motion were made. Measurements were also made of the Reynolds number effect on the centerline development of the turbulent intensity and the flatness factor of the velocity derivative at a fixed downstream centerline-location. The radial jet was observed not to attain the degree of self preservation noted for the plane jet in the range of the measurements. The mean velocity profiles were quite similar, but the meansquare turbulent velocity profiles were similar only away from the centerline, and the lateral intermittency distributions were highly dissimilar. Data for the energy balance was obtained at a convenient downstream location. (Author)