ノズル内部に偏向板を設置した長方形噴流の流れ特性

抄録

The flow characteristics of a rectangular jet with deflectors were investigated experimentally. Two flat deflector plates were installed symmetrically inside of a 2.17:1 rectangular nozzle to passively control the rectangular jet. The angle between the deflectors was set to α = 6° (Divergent deflectors), 0° (Parallel plates) and −6° (Convergent deflectors), and the effect of this change on the mean and fluctuating velocities was examined. The experiment was carried out at a Reynolds number of 9,000. In the case of the rectangular jet with the divergent deflectors, the minor axis spread was more promoted than the major axis spread, and the axis-switching phenomenon occurred closer to the nozzle exit than in the case with no deflectors. On the other hand, in the case of the rectangular jet with the convergent deflectors, the minor axis spread was more suppressed than the major axis spread, and axis-switching occurred farther from the nozzle exit than in the case with no deflectors. Therefore, the axis-switching location of the rectangular jet is significantly affected by the angle between the deflectors.