Two-dimensional turbulent jet on a combined wall having step changes in wall curvature
A study of a two-dimensional turbulent jet with a combination of two wall curvature parameters has been made. The wall consists of a plane, a logarithmic spiral and a plane surface. A large amount of attention has been paid to establish good two-dimensionality and to obtain best possible accuracy in the measurements with the hotwire anemometer system. The development of the mean velocity components, the three normal stresses and the shear stress are presented. The effects of the sudden changes in curvature on the structure of the flow are observed. The corrections of the hot-wire's directional sensitivity are also evaluated and applied using third order correlations. The correlations on the plane and the curved surface show details of the large scale motions at the outer part of the jet. The dissipation measurements have also been made. These measurements enable the evaluation of the terms of the turbulent kinetic energy equation. In addition, an attempt has been made to calculate the development of the plane wall jet using the measured turbulent kinetic energy balance to evaluate the empirical functions in the governing equations. -The measured values have been also used for the computation as the starting data.