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在系统压力0.2MPa-0.6MPa,进口过冷度5~40℃,质量流密度450~1600kg/(m2s)的范围内,研究了当试验段出口质量含汽率1%左右时垂直上升单管内自然循环两相流动不稳定现象,得到了系统发生密度波型脉动的曲线,并分析了脉动产生的机理。应用微分方程无因次分析方法导出了描述系统极限状态下各参数相互关系的极限状态方程式,由实验数据拟合得出系统发生不稳定界限的经验关系式。
In the range of system pressure of 0.2MPa-0.6MPa, inlet undercooling of 5 ~ 40 ℃, mass flow density of 450 ~ 1600kg / (m2s), the vertical rise Single-tube natural circulation of two-phase flow instability, the system has been generated density wave pattern of pulsation, and analyzed the mechanism of pulsation. The limit state equation describing the relationship between the parameters of the system under the limit state was derived by using the dimensionless analysis of the differential equation. The empirical relationship between the instability limits of the system and the system was obtained by fitting the experimental data.