论文部分内容阅读
以自编程序运动条件下自然循环分析程序PNCMC研究起伏条件下两相自然循环密度波不稳定性。研究表明:起伏条件下自然循环系统会发生密度波流动不稳定性现象,起伏引起的流量振荡动与密度波振荡相叠加,最终形成复杂的复合振荡;在长周期(13、23 s)起伏时流量的振荡周期与起伏周期相等,但一个起伏周期内存在多次振荡;在短周期(3 s)起伏时,复合振荡存在着2种状态,低功率时的复合振荡周期性差,表现出不可预测的在某个起伏周期内振荡的突然增强;高功率时,复合振荡表现出较好周期性;起伏条件下系统稳定边界是整体上移,而且周期越小,上移量越大。
Natural circulation analysis program PNCMC under self - programmed program was used to study the wave instability of two - phase natural circulation under fluctuating conditions. The results show that the instability phenomenon of density wave occurs in the natural circulation system under fluctuating conditions, and the fluctuating flow caused by undulation overlaps with the density wave oscillation to form complex complex oscillation finally. In the long period (13,23 s) The oscillation period of the flow is equal to the fluctuation period, but there are multiple oscillations in one fluctuation period. When the fluctuation period is short (3 s), there are two kinds of states of compound oscillation and the periodic oscillation of compound oscillation at low power shows an unpredictable The oscillation of the system oscillates suddenly in a fluctuation period. When the power is high, the complex oscillation shows a good periodicity. The stability boundary of the system fluctuates as a whole in the case of high power, and the smaller the period is, the larger the upward shift is.