長大管内の圧縮空気の減圧特性に関する研究 : 第1報, 実験

抄録

This paper describes an experimental investigation of the pressure reduction, which is initiated by the sudden discharge of compressed air from a long pipe to the atmosphere. The experimental apparatus consists of a combination of pipes, which have two kinds of bore (27.6 mm and 35.7 mm), three of lengths (222 m, 333 m and 410 m) and six orifice ratios. It has been made clear that the initial amount of pressure reduction at the open end increases linearly with the orifice ratio and the strength of the rarefaction wave attenuated exponentially with the distance from the open end of the pipe. The time for pressure reduction ratio ξ=0.17 at the closed end of the pipe whose bore is 35.7 mm is shorter than for a 27.6 mm pipe. when the orifice ratio is greater than 0.2.