1301 上壁のある円形衝突噴流により浮上する円盤に働く揚力 : 第 4 報ノズル直径の影響

概要

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An air circular jet from a nozzle set up on the upper side disk is impinging on the lower side disk placed on a support. For flow rate above some critical value, the lower side disk levitate. Experimental studies on the effect of nozzle diameter on the lift act on the lower disk were carried out. The upper side disk is 100mm in diameter and its nozzle diameter varies from 1.6 to 4.0mm. The diameter and mass of lower disk and the space of two disks were varied. The surface oil-flow pattern and the pressure distribution on the disk and the critical flow rate were measured. The levitation of the disk is due to a large pressure drop which is caused by the vena contracta due to the separation bubble attached on the upper side disk. The nozzle diameter have direct effect upon the velocity of jet. The smaller the nozzle diameter, the larger the negative pressure on the lower side disk. Then, the lift act on the disk increases. The critical flow rate and the falling critical flow rate are obtained using non-dimensional quantities including the nozzle diameter.
一般社団法人日本機械学会の論文
2002-09-20