流体素子内3次元流れの数値実験 : 噴流の挙動に及ぼすノズルの影響

概要

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The purpose of this study is to investigate the effects of the nozzle shape on the jet behaviour by means of the numerical experiment. The calculation was carried out for the three types of the fluidic devices that have different length of the nozzle throat. The flow was regarded as unsteady, three-dimensional, incompressible, viscous and laminar flow, and the primitive Navier-Stokes equations was calculated by use of predictor-corrector method. The obtained results are summerized as follows : 1. For a small aspect ratio, the jet attaches strongly when the length of the nozzle throat is shortened. On the other hand, for a large aspect ratio, it can be considered that there is no effect of the length of the nozzle throat. 2. The flow shows the symmetrical behaviour with respect to the nozzle, that is, in the upper stream, there exists a fluid flow from the midplane to the bottom bounding wall, and in the downstream, there exists a fluid flow from the bottom wall to the midplane. 3. When the length of the nozzle throat becomes shorter, the jet behaves in the similar manner to the case of higher Reynolds Number. This is closely related to the velocity distribution at the nozzle exit.
岡山理科大学の論文