CAJ | 학술논문

以AP1000核电厂中自动泄压管线（ADS‐4）与热管段形成的 T型结构为研究对象，开展缩小比例的T型管夹带实验。实验结果表明：大尺寸支管的夹带与小尺寸支管的夹带有明显差别。分层流情况下的夹带研究中发现两种夹带机理；在较低气相Froude数及较低气腔高度时，容易产生间歇流夹带；在较高气相Froude数情况下，往往出现环状流夹带。此外，实验研究发现，大尺寸支管中回流现象显著。支管形状对起始夹带有重要影响，而液体横流似乎并不影响起始夹带。
이AP1000핵전엄중자동설압관선（ADS‐4）여열관단형성적 T형결구위연구대상，개전축소비례적T형관협대실험。실험결과표명：대척촌지관적협대여소척촌지관적협대유명현차별。분층류정황하적협대연구중발현량충협대궤리；재교저기상Froude수급교저기강고도시，용역산생간헐류협대；재교고기상Froude수정황하，왕왕출현배상류협대。차외，실험연구발현，대척촌지관중회류현상현저。지관형상대기시협대유중요영향，이액체횡류사호병불영향기시협대。
With the T‐junction formed by the fourth stage automatic depressurization system (ADS‐4) and hot leg in AP1000 nuclear power plant as object of study ,a small‐scale experiment research on entrainment at T‐junction was performed .The visualiza‐tion research indicates that the entrainment phenomena through a large size branch are apparently different from those through a small branch .Two entrainment mechanisms could be found in the stratified flow entrainment area .Intermittent flow entrainment tends to occur at a lower Froude number and a lower gas chamber height .Annular flow entrainment always arises at a higher Froude number .Also ,the experimental research shows that the reverse flow is observable in a large size branch inlet .The geometry of the branch has an important effect on the onset entrainment .In addition ,liquid cross‐flow does not seem to affect the onset entrainment .