空気マイクロメータ内の流体の作動 : 第3報, 二枚円板形ノズルの特性その1,圧縮性を無視できる場合

概要

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A double-disc nozzle is an important member as the measuring part of an air-micrometer. On 11 types of sharp-edged and 11 types of rounded-entrance double-disc nozzles which have inside diameter of about 2mm and are used ordinarily for the low-pressure type air-micrometer, experiments were carried out in the case where the ratio of gap and inner diameter up to 0.1 using distilled water up to 3m head and low pressure dry air up to 500 mmAq differential pressure and the discharge characteristics were investigated. The results are summarized as follows : 1. The additional loss of head which had not been clear, excepting friction loss and outflow kinetic energy loss in the flow of a double-disc nozzle, was determined. 2. The values calculated using this result agree very well with the measured ones. So, unlike the characteristic equation heretofore, the characteristics of double-disc nozzle can be calculated accurately in the case of large gap, especialy when the nozzle is sharp-edged. 3. From the measurements of pressure distribution, it was found, too, that the friction loss accounts for the greater part of the head loss when the gap is small, but as the gap becomes larger, a trough appears in the pressure distribution curve which means the pressure loss becomes to be affected greatly by kinetic energy.
一般社団法人日本機械学会の論文
1964-02-25