抄録
An Air Deflecting Device having a convergent nozzle with combination of two control ports and curved guide walls has a feature of wide and continuous deflection. We studied about wide deflection mechanism of this device on the stand point of deflection effect in the upstream region of the nozzle.
Four parameters in the upstream region were examined by experiments and influences of the parameters on the deflection angle were revealed. At the same time, by using velocity and pressure data in the upstream region at a wide deflecting condition, we also made clear the feature of the wide deflection effect in the upstream region.
In order to get more detailed informations, flow visualization and numerical analysis were carried out. As a result, deflection effect in the upstream region was found out to be brought about by three factors; (1) existance of convergent streamlines, (2) curvature increase at the attachment side and (3) deflection acceleration effect at the non attachment side in the upstream region of the nozzle. By a result of numerical analysis, we also found out that chages of velocity vectors due to the deflection effect prevailed about 2.5 times of the nozzle width toward upstream of the nozzle.
