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本文提出了可用于非能动安全壳热量导出系统的大尺度开式自然循环系统的小比例模化方法,并对模型系统的运行特性与原型实验结果进行了对比。结果表明:通过本文的模化方法得到的模型系统不仅能很好地反映原型系统的流动现象,还能准确地估算原型系统的流动传热大小和流动不稳定边界;传热管内流体雷诺数对管内对流换热和两相振荡流动影响很大,模化时需保证模型系统传热管内流体的流动状态与原型相同;当根据实际需求对模型中某些结构参数加以限制时,得到的模型仍能较好地模拟原型系统的流动特性,在工程设计上具有一定的可行性。
In this paper, a small-scale modeling method for a large-scale open natural circulation system that can be used for passive containment heat-extraction system is proposed. The operating characteristics of the model system are compared with the prototype experimental results. The results show that the model system obtained by this method can not only reflect the flow phenomenon of the prototype system well, but also accurately estimate the size of the heat transfer and the boundary of flow instability in the prototype system. The Reynolds number The convective heat transfer and the two-phase oscillatory flow in the tube have a great influence on the flow, and the flow state of the fluid in the heat transfer tube of the model system must be ensured to be the same when the mold is modeled. When certain structural parameters of the model are limited according to the practical requirements, Can better simulate the flow characteristics of the prototype system, has some feasibility in engineering design.