片ポートを有する フリップフロップ・ジェット・ノズルの発振機構の実験的研究

抄録

To reveal the oscillation mechanism of a flip-flop-jet nozzle with a connecting tube, the authors assume that the jet switches when a time integral reaches a certain value. As the time integral, we consider the accumulated flow work of pressure, namely, the time integral of mass flux through a connecting tube into the jet-reattaching wall from the opposite jet-un-reattaching wall¹⁾. In the present study, in order to discuss the physics of the accumulated flow work further, we conduct the experiment in single-port control where the inflow from the control port on the jet-reattaching wall is forcedly controlled and the other control port on the opposite jet-un-reattaching wall is sealed, instead of the experiment in regular jet's oscillation using the ordinary nozzle with two control ports in connection. As a result, the accumulated flow work of the inflow until the jet's switching well agrees with that in regular jet's oscillation using the ordinary nozzle.