コアキシャル型分岐管における湿り蒸気流中の音響共鳴特性に対する蒸気圧力と湿り度の影響

抄録

Steam piping and components such as in power plants sometimes experience structural vibration and fatigue damage caused by flow-induced acoustic resonance in piping with closed side branches. The state of steam state in the practical steam piping can be not only dry steam but also wet steam. From our prior research on the combined effects of steam wetness and pressure on general characteristics of acoustic resonance amplitude under wet steam flows in a single branch, the reduction of the maximum amplitude under wet steam was related to both the steam wetness (void fraction) and the steam pressure (density ratio). In this study, we conducted experiments on acoustic resonance in coaxial-type side branches under wet steam flow with the steam wetness and static pressure as parameters to clarify the combined effects of the steam wetness and pressure on the pressure fluctuation.