Construction of a High-Speed Liquid Flow Apparatus Operated by Compressed Air

概要

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By using an apparatus in which a water column is accelerated by compressed air in a tube, the column velocities up to about 100m/sec are obtained. The liquid column motion in the tube is approximately analysed in order to determine the driving pressure and the apparatus dimensions such that the desired velocity of liquid flow can be obtained at the end of the tube. Magnitude and duration of impact pressure caused by the water column stopping at the closed end of the tube are calculated, considering the variation of compressibility of water with a change in pressure. Those results coincide with experimental data given by Rice and Walsh, and by Cook et al., and involve Heymann's formula as being the first approximation. Experimental results obtained in the constructed apparatus showed that the actual impact pressure were influenced by vacuum pressure in the tube before the impact.
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