多段パイプライン・スタンドシステムのサージングに関する研究(I) : オリフィスと自動定量分水装置の効果について

This paper studied on the hydraulic transients in the pipeline with 3 pipe stands (upper, middle and down side) system. Firstly, the amplification of the surges in the tank were compared with the relations of different hydraulic conditions, caused by the sudden opening and closing of the valve of the end of the system.
Then to prevent from the dangerous water level by the amplification of the surge, that usually caused by the air, in the pipe, which is taken by the overflow-water from the weir, all pipe stands were divided into two parts by a board with an orifice at the bottom of it.
Secondly, in the two stanks and pipe systems, some effects about the regulation of the amplification with the propagation of the surge by the orifice and automatic diversion apparatus with buoyancy were examined.
These experimental results showed that when the down sited valve was suddenly opened in a short time, the oscillations of the displacements of the water surfaces in the stands from the equilibrium (i. e. hydrostatic) positions happend and some amplifications with the propagations were observed. But under some velocity, oscillations could not be observed.
Here, the amplification ratios in the down or upper placed stand were bigger than those in the middle suited one. And the sensitivity of water heightvariations showed that these had much relations with the periodical length of sine-curved input flow of time series.
And the next results showed that the coexistance of the orifice and the apparatus had very sufficient facility on the regulation of these amplification of the surge.