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采用RELAP5/Mod3.4软件对某一中压受热通道进行密度波不稳定性分析,探讨了节点个数对流动不稳定性的影响,分析了入口单相水的质量流量、入口长度和上升长度、入口和出口局部阻力系数、入口过冷度对受热通道密度波不稳定性的影响,并通过引入过冷数和相变数得到了受热通道的稳定边界.结果表明:在使用RELAP5程序进行不稳定性分析前,有必要进行节点划分敏感性分析;当增大受热通道入口单相水质量流量或增大入口局部阻力系数时,受热通道的流动稳定性增强;当增大受热通道入口长度或上升长度和出口局部阻力系数时,受热通道的流动稳定性降低;过冷数和相变数可用于描述受热通道稳定性边界.
The density wave instability of a medium pressure heated channel was analyzed by RELAP5 / Mod3.4 software. The influence of the number of nodes on the flow instability was analyzed. The mass flow, inlet length and rising length , The local resistance coefficient of inlet and outlet and the effect of inlet undercooling on the instability of the density of heated channel, the stable boundary of the heated channel is obtained by introducing the subcooling number and phase transition number.The results show that when using RELAP5 program, Before the stability analysis, it is necessary to conduct node division sensitivity analysis. When increasing the mass flow rate of single-phase water at the inlet of the heated channel or increasing the local resistance coefficient at the inlet, the flow stability of the heated channel is enhanced. When the entrance length of the heated channel is increased or Rising length and exit local resistance coefficient, the flow stability of the heated channel decreases. The number of subcooling and the number of phase transitions can be used to describe the stability of the heated channel.