摘要
针对典型的超临界压力下自然循环回路,建立模型,分别采用基于延拓的非线性数值算法和基于频域法的matlab程序计算并判断回路的静态和动态稳定性;使用无量纲相似准则数对加热段入口温度、回路当量直径及加热段进出口局部阻力进行了参数效应分析。结果表明:静态不稳定主要发生在加热段入口温度较低的工况;回路当量直径和加热段出口局部阻力对静态稳定性影响不显著;而增大加热段入口局部阻力提升静态稳定性;动态不稳定主要发生在加热功率较高的工况,增大加热段入口局部阻力或在一定范围内增大直径可以提高回路动态稳定性;增加加热段出口局部阻力降低回路动态稳定性。使用抽样方法,在回路系统参数的可能选取范围内,综合研究了回路参数对稳定性影响,在无量纲参数空间表示计算结果,分别得到无量纲参数空间内的静态不稳定域和动态不稳定域。
A typical hydrodynamic natural circulation loop under supercritical pressure is modeled to analyze the instability behavior. The static stability is calculated through a nonlinear numeric algorithm while the dynamic stability is calculated through a program based on frequency domain method. The results are presented in the form of dimensionless numbers. Influential parameters and their impacts on instability are calculated and discussed. The major factors include inlet temperature, diameter of the loop and local resistances at the inlet and outlet of heating section. According to the results, static instability phenomenon is observed when the inlet temperature of heating section is relatively low. Diameter of the loop and local resistance at the outlet of heating section have relatively little influence on the static stability while increasing local resistance at the inlet helps to stabilize the loop to the static instability aspect. Dynamicinstability is observed when the heating power is relatively high. Local resistance at the inlet of heating section helps to stabilize the loop while local resistance at the outlet makes the loop dynamically instable. The increase of diameter in a certain rage can also improve the dynamic stability. According to practical conditions of engineered test facilities of natural circulation, the possible ranges of affecting parametric factors are proposed. Sets of parameter combinations are acquired through a stratified sampling method,namely LHS（Latin Hypercube Sampling）, for stability calculation input. And as a result of instability calculations, a static stability regime and a dynamic stability regime of are preliminarily figured out and studied.
出处
《核科学与工程》
CSCD
北大核心
2017年第6期920-928,共9页
Nuclear Science and Engineering
关键词
超临界压力
自然循环
静态稳定域
动态稳定域
无量纲
Supercritical pressure
Natural circulation
Static stability regime
Dynamicstability regime
Dimensionless
作者简介
章明德（1992-），男，江苏人，硕士研究生，从事反应堆热工水力及安全分析研究工作;匡波：bkuang@sjtu．edu．cn
