変形するノズルから流出する噴流

抄録

The purpose of this study is to control the jet diffusion by using the deforming nozzle. The exit shape of polypropylene nozzle can change from square shape into cruciform one smoothly and periodically. To catch the flow feature, the flow visualization was carried out by using the Laser Light Sheet and the high-speed videocamera. Moreover the velocity measurement of the jet flow was conducted using a PIV method, by changing the nozzle shape variously. The basic characteristics of the jet flow, such as the velocity distribution and the half value width have been obtained.

As a result, it has been found that the diffusion of the jet issuing from the deforming nozzle whose exit shape changes to cruciform from square and furthermore returns to square periodically and continuously is promoted in the downstream region, comparing with the case of the square nozzle jet.