抄録
This paper deals with statistical properties and dynamical structures of turbulence in a plane wall jet (PWJ) and a three-dimensional wall jet (3DWJ.) Measurements have been made in the flow fields created from jets impinging tangentially on a plate from a rectangular slit and circular nozzle, respectively. Basic quantities of these flows measured with a hot-wire anemometer are compared with each other. The nozzle-exit Reynolds numbers for the PWJ and 3DWJ were 15,000 and 100,000, respectively. The velocity profiles of U and W in the cross section of the fully-developed 3DWJ are nearly similar when they are nondimensionalized with the local maximum velocities and nozzle diameter, which imply that the length scale in the y-direction varies little in the z-direction. Multi-point velocity measurements were made on both flows with hot-wire rake probes. Coherent structures in the y-direction were analyzed by the POD in spatial domain.
