非能动余热排出管内蒸汽凝结水击压力振荡特性实验研究

Based on the visualization experimental system of the passive residual heat removal pipe, the condensation induced water hammer (CIWH) in the passive residual heat removal pipeline was experimentally studyed through the high-speed camera and fast dynamic pressure transducers. The coupling relationship between steam-water phase interface evolution and pressure oscillation during the CIWH process was investigated. And the variation laws of the CIWH 's occurrence process, position, and number were also analyzed. Results show that the CIWH would experience four stages such as stratified flow, wavy flow, slug flow and steam bubble collapse. The pressure in the pipe is stable during stratified flow and wavy flow, which is negative during slug flow.And a huge pressure pulse is generated when steam bubble collapses. The CIWH position will move towards to the pipe outlet and the occurrence number will decrease with the rise of heat flux density and water temperature.