蒸汽射流直接接触凝结诱导振动特性研究

Direct contact condensation of the steam jet in the subcooled water flow inside the pipe can induce severe pipe vibrations. In this paper, a high−speed camera and an acceleration sensor were used to capture the evolution of the jet interface and the induced pipeline vibration. The characteristics of grayscale centroid oscillation considering steam jet plume morphology and pipeline vibration are quantitatively described. The oscillation amplitude of the grayscale centroid of the plume is the highest in the Oscil−I condensation regime, the lower in the chugging regime, and the lowest in the stable regime. The intensities of the centroid oscillation and pipeline vibration decline with increasing steam mass flux and a strong correlation is revealed. On this basis, the distribution diagram of pipeline vibration intensity with steam mass flux and subcooled water temperature is drawn, and the vibration intensity increases with the increase of subcooled water temperature. Correlation analysis quantitatively confirmed that the axial oscillation of the plume grayscale centroid is the dominant factor of the pipeline vibration along the steam injection direction.