直流蒸汽发生器的流动不稳定性分析  

Analysis of Flow Instabilities for Once-Through Steam Generator

作　　者：侯素霞[1] 赵福宇[1] 刘成[1] 邰云[1] 

机构地区：[1]西安交通大学多相流国家重点实验室

出　　处：《核动力工程》2008年第5期43-47,共5页Nuclear Power Engineering

摘　　要：以蒸汽发生器为研究对象,采用频域控制理论分析并联多通道流动不稳定性的发生机理。建立直流蒸汽发生器的传热和流动数学模型,利用线性微扰原理和Laplace变换推导出闭环系统的特征方程,结合Nyquist稳定性定理判断系统的稳定性。在此基础上,编制了计算机程序对蒸汽发生器的稳定性进行分析。结果表明:系统的稳定性和通道数目有一定关系;随着入口阻力因数的增大,系统的稳定性提高;随着运行负荷的降低,系统的稳定性逐渐降低。This paper analyzes the two-phase flow instabilities in parallel tubes using frequency domain control theory for steam generator in order to disclose the mechanism of flow instability. The mathematics expressions of heat transfer and flow of steam generator are proposed, and the eigenfunction of the close loop system is deduced using linearize perturbation theory and Laplace transformation. System stability is judged by Nyquist stability criterion of automatic control theory. On the above bases, the computer code is derived, and the stability analysis of steam generator is made by using this code. The results show that there is certain relations between the system stability and the channel number. The increasing of entrance resistance factor enhances the system stability; and the reducing of operation load impairs the system stability gradually.

关 键 词：直流蒸汽发生器 两相流 不稳定性 频域法 

分 类 号：TL362.5[核科学技术—核技术及应用]