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非能动安全壳冷却水系统响应至壳外水膜稳定的时刻称为延迟时间。延迟时间是非能动换热、核安全系统设计等方面的关键参数。在重力作用下,大空间曲率表面降膜流动覆盖安全壳表面有2个过程:1水流向下流动,导致原干区变为湿区;2因水膜的半稳定性,横向润湿干区,使得接触角变小,缓慢增加水膜覆盖区域。2个过程的耦合导致难以判定壳外水膜稳定的时刻。本文根据非能动大型先进压水堆核电站CAP1400水分配试验,在获得收集水槽液位、流量和水膜覆盖图片等数据的基础上,通过图像处理方法及对比分析,提出流量稳定和覆盖稳定2种判定水膜稳定的方法,解决延迟时间的计算问题,得到不同分水结构形式下延迟时间随流量的变化趋势和规律。
The time when the passive containment cooling water system responds to the stability of the water film outside the shell is called the delay time. Delay time is a key parameter in passive heat exchange and nuclear safety system design. Under the action of gravity, there are two processes in which the flow of falling film on the surface of large space covers the surface of the containment: 1, the water flows downward, resulting in the original dry zone becoming wet zone; 2 due to the semi-stability of the water membrane, , Making the contact angle smaller, slowly increasing the water film coverage area. The coupling of the two processes results in a difficult time to determine the stability of the water film outside the shell. Based on the CAP1400 water allocation test of a large passive PWR nuclear power station, based on the data of collecting the liquid level, the flow rate and the water film coverage, the image processing method and comparative analysis were put forward to propose two kinds of flow stability and coverage stability Determine the method of water film stability, solve the calculation of delay time, and get the change trend and regularity of delay time with different water diversion structure.