非定常流における円筒形絞りに発生するキャビテーション特性 : シャープエッジをもつ絞り部の長さが長い場合

概要

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This paper deals with an experimental study on the unsteady cavitation performance in a long cylindrical choke with the sharp-edged corner. The unsteady flow takes the trapezoid form with time at the downstream of a choke. Experiments are carried out for four kinds of the choke diameter d under various rates of the pressure changes while keeping the choke length l and the upstream pressure p_1 constant. The main objective of this study is to find four kinds of the critical cavitation numbers k_<ci>, k_<cci>, k_<cd> and k_<ccd> for three each location within a choke and only k_<ci>, k_<cd> for the outlet of choke : the incipient cavitation number k_<ci>, the desinent one k_<cd>, the cavitation number k_<cci> of "beginning of choking", which is the value at the moment which the full bubbles begin to appear in a choke, the cavitation number k_<ccd> of "end of choking", which is the value at the moment which the full bubbles in a choke begin to collapse. It has been clarified that each value of four kinds of these numbers depends on each location within the choke, the ratio of pressure change and the choke diameter.
社団法人日本機械学会の論文
1998-10-25