円管側面からの噴流の拡散特性

抄録

Velocity fields of air circular jets issued from circular holes arrayed in a line on a flat plate and a half round tube were investigated experimentally with a central focus on the effect of curved surface with the circular holes exist. The circular holes were arrayed at regular intervals in a line, and ratios of the interval s to the jet exit diameter d was 1.5. The Reynolds number based on the jet exit diameter d and the jet exit velocity Ue was 2000 for the experiments. Velocities were measured with a single normal hot wire probe, and fundamental properties of the jet diffusion were discussed. The experimental results have suggested that the jet width was increased in an initial region by the effect of the curved surface of jet outlets, which leads to non-uniform curvature effects of the shear layer and vortex ring.