円筒形絞りに発生するキャビテーションの抑制 : 第1報,ノズルとじゃま板の効果(流体工学,流体機械)

概要

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This paper deals with an experimental study on the suppressive method of cavitation for steady and unsteady flows in cylindrical chokes of oil hydraulics. The unsteady flow takes a trapezoid form with time in the upstream of a choke. Experiments were carried out for the various combinations obtained by setting up the nozzle in the inlet and the baffle plate in the outlet of the choke under two parameters: three diameters d, two chamfered lengths s of the choke. The pressures of three locations in a choke and a location at just behind the choke were measured by the use of pressure transducers at the same time for inlet pressure p_1. From these data, cavitation numbers of the beginning and the end of choking calculated for four locations of the choke. Moreover, cavitating flows in the choke were visualized by a camera. As a result within the limits of this experimental study, it was found that the most effective suppressive method of cavitation is to use the nozzle placed at the inlet of the chamfered choke with the baffle plate placed at a distance of 3mm from the outlet of the choke.
社団法人日本機械学会の論文
2004-11-25