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CHF是压水堆中的一个重要的物理现象,t_(CHF)决定了压水堆发生失水事故后安全保护系统必须投入的时间,因此对瞬态CHF和t_(CHF)的研究具有重要的理论和实际意义,对压水堆运行具有参考价值。本文通过模拟小破口,利用直接通电均匀加热的垂直圆管作为实验段以及精心设计的喷放段,对t_(CHF)进行研究,给出了定量的结论。本实验的工况参数范围是:P=0.7～2.2 MPa,△T_(sub)=50～120℃,G=1750～2800 kg/m~2·s,q=0.3～1×10~5W/m~2
CHF is an important physical phenomenon in pressurized water reactors. The value of CHF determines the time that safety protection system must invest after a waterlogging failure. Therefore, it is important to study the transient CHF and t_ (CHF) Theoretical and practical significance, has a reference value for pressurized water reactor operation. In this paper, we study the t CHF by simulating the small break and using the vertical tube heated uniformly by direct electricity as the experimental section and well-designed discharge section, and give the quantitative conclusions. The range of working parameters in this experiment is: P = 0.7-2.2 MPa, ΔT sub = 50-120 ℃, G = 1750-2800 kg / m 2 · s, q = 0.3-1 × 10-5W / m ~ 2