円筒形絞りに発生するキャビテーションの可視化

概要

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This paper deals with an experimental study on the flow visualization of cavitation for steady and unsteady flows in cylindrical chokes of oil hydraulics. Experiments for the unsteady flow are carried out under a condition in which the inlet pressure p_1 in the cylindrical choke takes a trapezoided form with time, while keeping the outlet pressure p_2 constant. The behavior of the cavitation bubbles is clarified with an ultrahigh-speed camera under two geometric parameters: the diameter and the chamfered length of the choke. Also, a method for suppressing the occurrence of cavitation is studied. It becomes clear that a bubble which appears in the earliest stage of cavitation "grows, collapses, disappears and reappears repeatedly" at intervals of about 1.0x10^<-4> seconds.
社団法人日本機械学会の論文
1996-09-25