摘要
采用一维均相流模型，运用Clausse和Lahey提出的非线性两相流垂直上升单管分析法，考虑倾斜角度、内螺纹管因素，发展了多管道系统不稳定性理论模型；对超临界锅炉并联倾斜内螺纹双管汽-水两相流密度波型脉动进行了理论分析和求解。采用时域法求得密度波型脉动发生时，试验段进口质量流量在各个时间点的数值。根据流量随时间发散或收敛的趋势，判断得到发生脉动的阈值。对脉动时的周期、振幅等特征值进行分析，得到进口质量流量随时间的变化规律。计算得到的各工况下的脉动周期范围大多在5～16S之间，与实验所得的7～19S基本吻合。比较可得，该模型的计算结果与试验数据符合较好，可用于判定是否发生密度波型脉动，为确定锅炉安全运行时的水冷壁参数提供参考。
An instability theoretical model for multi-channel system had been developed by building one-dimensional homogeneous model and adopting nonlinear analysis for two-phase flow in vertical single pipe, supplied by Clausse and Lahey. With the same parameters as the experiment, two-phase flow density wave oscillation in parallel inclined inner ribbed pipes was analyzed and solved in this paper. The variation of the working fluid inlet velocity perturbation with time was found using the time domain method. The criteria of density wave oscillation were defined according to the convergence or divergence of the velocity. The pulse cycle of calculated results was mostly between 5 and 16 seconds, which was quite similar to the data between 7 and 19 seconds in file exper;,ment. It isshown that the calculated results have a good agreement with the experimental data. Therefore, the method can be used to determine whether the incidence of density wave instabilities. It can also provide a reference for the safety parameters of the water wall in the supercritical Pressure boiler.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2008年第4期63-68,73,共7页
Nuclear Power Engineering
关键词
超临界锅炉
并联倾斜内螺纹管
两相流不稳定性
密度波型脉动
数值研究
Supercritical pressure boiler, Parallel inclined inner ribbed pipe, Two-phase flow instability,Density wave oscillation, Numerical research
