非付着側壁の影響による付着噴流の切換

概要

論文の詳細を見る
The change of jet attachment on side walls, called switching is possible by displacing the detached or attached side wall to or from the jet nozzle. To obtain the effect of the side walls on switching, the static pressures in both sides of jet are measured. The width of the nozzle is 5mm, aspect ratio 2, and the length of walls are 22 times as long as the nozzle width. Reynolds' Number is set 3000 at the nozzle. The measuring positions of pressure are selected not to be affected by the displacement of separation vortex. The wall offset and the control nozzle width in the detached side proved more effective on switching than that of the attached side. The two switching modes that is, approaching of the detached wall to the jet nozzle and moving away of the attached wall from the jet nozzle, have a similar condition of asymmetrical position of side walls. Although most switchings are realized when the pressure differences between the two sides of jet decreased, switching occurs in a small offset and at small angles when the pressure difference is increasing. The downstream momentum of attachment point is obtained from the measured pressure and a simple model of attached jet. The maximum output recovery pressure is then evaluated from the momentum, by assuming some experimental patterns and the continuity of flow.
明治大学の論文