二次元オフセット噴流における出口形状の効果

抄録

The effect of the outlet shape on a two-dimensional offset jet is investigated experimentally. The offset jet is produced by the flow of air which issue from the end of a long parallel channel. The offset ratio H/h (H : step height, h : channel height) is constant at 2.0, and four types of jet outlet shapes are examined. The exit Reynolds number Re is changed in 2.0 ×10³ to 8.0 ×10³. When the position of the reattachment point is nondimensionalized by the step height, it moves downstream by providing a curvature at the jet outlet in the laminar region. However, the reattachment length is approximately same in the turbulent flow. For all Reynolds numbers, the pressure loss is reduced by rounding corners of the outlet compared to right angles.