泵驱动两相系统流动稳定性的时域理论研究  

Time Domain Theoretical Research on Flow Stability of a Pump Driven Two-Phase System

作　　者：苏阳 李晓伟 吴莘馨 SU Yang;LI Xiao-Wei;WU Xin-Xin(Institute of Nuclear and New Energy Technology,Collaborative Innovation Center of Advanced Nuclear Energy Technology,Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学核能与新能源技术研究院,先进核能技术协同创新中心,先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《工程热物理学报》2022年第2期459-464,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51576103);国家科技重大专项资助项目(No.ZX06901);国家重点研究发展项目(No.2020YFB1901600)。

摘　　要：蒸汽发生器中可能出现的两相流不稳定现象会导致二回路流量、压力和温度的脉动,不仅干扰控制系统,还可能引起传热管热疲劳损坏。首先,采用集总参数法和小扰动线性化方法,建立了由泵驱动的两相系统的时域理论模型。然后对比分析了泵驱动边界条件和恒定压降边界条件,以及泵特性曲线的斜率对系统稳定性的影响。结果表明,随着泵特性曲线斜率绝对值的下降,系统的稳定性变差。相比于泵驱动边界条件,恒定压降边界条件下系统更容易出现不稳定性,因而恒定压降边界条件的假设更加保守。Two-phase flow instability may happen in steam generators.It will cause pulsation of the flow,pressure and temperature of the secondary loop.Two-phase flow instability not only interferes with control system,but also causes thermal fatigue damage to the heat transfer tubes.First,time domain theoretical model of a pump driven two-phase system were established using lumped parameter method and small disturbance linearization method.Then the influences of pump driven boundary condition and constant pressure drop boundary condition on system stability were compared.The effects of the slope of the pump characteristic curve on system stability were also discussed and analyzed.The results show that system becomes unstable when the absolute value of the slope of the pump characteristic curves decreases.Compared with the pump driven boundary condition,the system is more unstable under the constant pressure drop boundary condition,so the assumption of constant pressure drop boundary condition is more conservative.

关 键 词：蒸汽发生器 时域理论模型 泵特性曲线 恒定压降边界条件 

分 类 号：TL333[核科学技术—核技术及应用]