Abstract
In this paper, the switching transient of the jet for a bistable wall attachment fluid amplifier is investigated by a quasi-steady state analysis, applying the theory based on turbulent jet entrainment properties.
From the experimental results which were carried out in advance to compose the theoretical model, it was recognized that there was a considerable difference in the pattern of jet switching according to the magnitude of the output resistance.
The theoretical model adopted here could be applied in the case of a comparatively large output resistance and small control to supply momentum ratio.
In work previously done, Lush considered the momentum interaction between the supply and control jets, and Epstein took further the mass interaction into account. The authors also considered the momentum interaction between them, but the mass conservation was treated in the attachment bubble.
The limitation due to deciding the end of the switching transient, appling Epstein's model, was avoided by the Jet Swithing Volume Rate, which was experimentally given under consideration of the Effective Bubble Volume Factor proposed by the authors.
Further, if the jet spread prameter were suitably varied throughout the switching transient, the behaviour could be explained more exactly by this model. The effect of the variation of this spread parameter is also discussed in this paper.
