开式自然循环流动不稳定性的频域法分析

发布时间：2018-07-10 03:36

本文选题：开式自然循环 + 频域法　；参考：《原子能科学技术》2017年10期

【摘要】：非能动安全壳热量导出系统依靠自然循环导出事故后排入安全壳内的热量,但在运行过程中也可能发生流动不稳定性现象。本文以某开式自然循环非能动安全壳热量导出系统为对象,建立了描述该系统行为的数学模型和本构关系,运用小扰动法对守恒方程进行线性化,通过Laplace变换获得系统质量流速随加热段进口焓变化的传递函数。基于Nyquist稳定性判据,分析了热工参数变化对该自然循环系统稳定性的影响。结果表明:系统的流动稳定性本质上受空泡份额随质量含气率的变化关系的制约,在一定范围内,随着质量含气率的增大,空泡份额对质量含气率的敏感性减弱,系统趋于稳定。
[Abstract]:The passive containment heat derived system relies on the natural circulation to derive the heat discharged into the containment after the accident, but the flow instability may also occur during the operation process. In this paper, a mathematical model and constitutive relation describing the behavior of an open natural cycle passive containment heat derivation system is established, and the conservation equation is linearized by using the small perturbation method. The transfer function of mass velocity with the inlet enthalpy of the heating section is obtained by Laplace transform. Based on Nyquist stability criterion, the influence of thermal parameters on the stability of the natural circulatory system is analyzed. The results show that the flow stability of the system is essentially restricted by the relationship between the void fraction and the mass gas content. In a certain range, the sensitivity of the void fraction to the mass gas content decreases with the increase of the mass gas content. The system tends to stabilize.
【作者单位】：哈尔滨工程大学核安全与仿真技术国防重点学科实验室;华龙国际核电技术有限公司;中国核工业集团公司;中国核电工程有限公司;
【分类号】：TL364.3

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