基于RELAP5的运动条件下并联双通道流动不稳定性研究

摘要

随着船用核动力装置的广泛应用,运动条件引起的热工水力现象逐渐受到重视.反应堆堆芯内存在大量并联通道,通过在RELAP5程序的动量方程源项中添加运动条件引起的附加力,开展了倾斜、起伏及摇摆等典型单一运动条件及其耦合运动条件下的并联双通道在强迫循环下的流动不稳定性研究.对比了静止条件及不同运动条件下的不稳定性边界曲线,结果表明,强迫循环下运动条件对并联通道流动不稳定性的影响较小.相同过冷度数下,运动条件与静止条件的相变数差别在2％以下.%As the marine nuclear power device is operated widely,the thermal hydraulic phenomenon caused by motion conditions is considered significantly.Since many parallel channels exist in the reactor core,the study of flow instability in parallel double channels under single and coupled motion conditions was carried out by modifying the source term in momentum equation adopted in RELAP5 code.The marginal stability boundary (MSB) curves under static and motion conditions were compared,and it is shown that the effect of different motion conditions on flow instability is very small under forced circulation.With the same subcooled number (Nsub),the difference between phase change numbers (Npch) of static condition and motion condition is under 2 ％.