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在热工水力实验回路上,利用直接通电均匀加热的垂直圆管(φ15mm×2mm)作为实验段,利用合理设计的喷放段来模拟小破口的出现.通过实验,得出了系统压力、质量流速、壁温随喷放时间的变化关系以及压力、质量流速、初始过冷度、临界时间的相互影响关系曲线.这对瞬态CHF和t_(CHF)的研究具有重要的理论和实际意义,对反应堆的运行具有一定的参考价值.本实验的工况参数范围是:p=0.7～2.2MPa,▽T_(sub)=50～120℃,G=1750～2800kg/m~2·s,q=0.3～1×10~6W/m~2.
In the thermal hydraulic experiment loop, a vertical tube (φ15mm × 2mm) heated uniformly by direct energization was used as an experimental section, and a properly designed discharge section was used to simulate the occurrence of a small breach. The experimental results show that the system pressure, Mass flow rate, the relationship between the wall temperature and the discharge time, and the interaction between the pressure, the mass flow rate, the initial subcooling degree and the critical time.This study on transient CHF and t CHF has important theoretical and practical significance , Which has a certain reference value for the operation of the reactor.The working parameter range of this experiment is: p = 0.7 ~ 2.2MPa, ▽ T sub = 50 ~ 120 ℃, G = 1750 ~ 2800kg / m ~ 2 · s, q = 0.3 ~ 1 × 10 ~ 6W / m ~ 2.