Kouzou Sudou

Two-Dimensional Impinging Jet on Concave Surface.

Mean and fluctuating velocities have been measured for a two-dimensional gas jet impinging on a solid concave surface. Measurements are made by the technique of rotating a probe with an inclined hot wire under the Reynolds number of 16500. The figures are shown for distributions of the mean velocity, the turbulence energy and the Reynolds stress. And the influence of the curvature of the wall is found evidently in these jet characteristics. Also, the static pressure in the jet and on the surface is calculated by using the measured results of velocities, and the validity of the calculating method is confirmed by comparison with the experimental results.

Numerical analysis of the switching mechanism in a turbulent wall-attachment device.

The turbulent flow mechanism in a wall-attachment fluidic device was analyzed with numerical predictions. The computation was carried out with the finite difference method in conjunction with the k-e turbulent model and the semi-implicit method for the pressure-linked equation. The computation procedure employed in this paper could define the boundary conditions definitively at the ports for input and output. The numerical solutions provide the velocity profiles, the pressure distributions, the turbulent energy distributions, and the energy dissipation rate distributions in the flow field. The switching flow rate obtained by the numerical computation was compared with that measured by experiment. It is found that the numerical predictions closely simulated the flow mechanism during the process of the jet switching in the device.