冷却空洞が発生した密封管の急開封時の水撃

概要

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Since the closed pipe under generation of the cooling cavity holds the low pressure near the saturation vapor pressure, quickly opening of the valve at an end of the pipe in that condition, the cavity is collapsed by the impressed atmospheric pressure, and an intense waterhammer occurs. The above phenomenon is modeled by the rigid column theory. The theoretical expression is derived to give the maximum pressure rise using the volumetric fraction of the cavity, the impressed pressure difference, the density and the sonic velocity of the liquid in the pipe. The estimated curve is compared with the experimental data. A weak buffer effect of the air in the cavity is shown quantitatively by the experiment. Because of the air containment, the cavity does not completely disappear and some bubbles of air remain after the collapse.
一般社団法人日本機械学会の論文
1991-06-25