直流蒸汽发生器稳态与瞬态特性数值模拟  

Numerical Simulation of Steady-State and Transient Characteristics of Once Through Steam Generators

作　　者：赵孝 白宇飞 张震[1] 杨星团[1] Zhao Xiao;Bai Yufei;Zhang Zhen;Yang Xingtuan(Key Laboratory of Advanced Nuclear Reactor Engineering and Safety,Ministry of Education,Institute of Nuclear and New Energy Technology,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,先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《核动力工程》2020年第6期8-13,共6页Nuclear Power Engineering

基　　金：国家重大科技专项经费资助(2011ZX06004-008)。

摘　　要：直流蒸汽发生器内二次侧流体被一次侧流体加热,其轴向热流密度分布与两侧流体运行参数密切相关。采用RELAP5/MOD4.0程序对直流蒸汽发生器的稳态与瞬态运行特性进行数值模拟研究,获取了直流蒸汽发生器热工参数的振荡特征,并进一步探究了一个周期内不同时刻的二次侧流体的质量流量、热流密度及管壁温度的瞬时轴向分布以及二次侧入口节流对流动振荡的影响。结果表明:对流加热工况下轴向热流分布主要取决于一次侧流体和二次侧流体之间的温差。当直流蒸汽发生器内发生密度波振荡时,一次侧出口温度及总加热功率均剧烈振荡。干涸点的位置大幅移动,且其附近的壁温强烈波动,可通过增大二次侧入口节流抑制流动振荡。In once through steam generators,the secondary fluid is heated by the primary fluid.Therefore,the axial heat flux distribution is related to the operational parameters of the fluids in both sides.The RELAP5/MOD4.0 code is adopted to perform the static and transient simulations of a once through steam generator.The temperature,thermal equilibrium quality and heat flux distributions under both heating modes are analyzed and compared.The oscillation behavior of the once through steam generator is discussed and the instantaneous axial profiles of secondary mass flow rate,heat flux as well as tube wall temperature corresponding to four representative times in an oscillation period are further investigated.Finally,the effect of increasing the secondary inlet throttling is studied.The results show that the shape of heat flux distribution under convective heating mainly depends on the temperature difference between primary fluid and secondary fluid.When density wave oscillations occur in the once through steam generators,the primary outlet temperature and total heating power oscillate intensely.The location of the dryout point moves greatly and the tube wall temperature fluctuates most violently in its vicinity.Flow oscillation could be suppressed by increasing the inlet throttling of the secondary side.

关 键 词：直流蒸汽发生器 对流加热 流动不稳定 RELAP5 

分 类 号：TL333[核科学技术—核技术及应用]