円筒形絞りのキャビテーション特性 : 第2報,非定常流における臨界キャビテーション係数

概要

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This paper deals with an experimental study on the unsteady performance in cylindrical choke of the oil hydraulic equipment. Experiments are performed under unsteady flow in which the outlet pressure P_2 of the cylindrical choke takes the form of a trapezoid varying with time, keeping the inlet pressure p_1 constant. It is found that as the absolute values of the rates of pressure change dp_2/dt increase, the incipient cavitation number k_<ci> shows a tendency to decrease, and the desinent one, k_<cd>, shows a tendency to increase with three geometric parameters : diameter, length and chamfered length of the choke. The values of k_<ci>, and k_<cd> with the chamfered length of chokes are smaller than those with the sharp edge of chokes for various dp_2/dt. As the larger absolute values o dp_2/dt further increase, the hysteresis between k_<ci> and k_<cd> becomes larger for each combination of the cylindrical choke.
社団法人日本機械学会の論文
1993-05-25