Two-dimensional turbulent jet on a combined wall having step changes in wall curvature

A study of a two-dimensional turbulent wall 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. 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. 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.