【作者】 周剑； 孙中宁； 丁铭； 张银星；

【Author】 Zhou jian;Sun zhongning;Ding ming;Zhang yinxing;Harbin Engineering University;

【机构】 哈尔滨工程大学；

【摘要】 针对PCCS(Passive containment cooling system,安全壳非能动导热系统)中心型内部换热器内流量分配特性进行数值模拟研究。依据联箱内压力变化规律,探讨了不同流量下联箱直径对流量分配特性的影响。根据不同的流量分布形式和联箱内主导压力的作用方式,划分了三种波形(第一类,第二类,第三类波形)和三种压力控制区(静压恢复强盛区,静压恢复衰弱区,静压恢复和摩擦阻力联合控制区),并给出了不同波形下,联箱直径的变化对流量分配均匀性的影响。研究表明,要改善流量分布的均匀性,对于第一类波形,应增大联箱直径;对于第二类波形,应减少联箱直径;对于第三类波形,应增大联箱直径。更多还原

【Abstract】 A numerical investigation has been performed on the characteristics of flow distribution in the the central-type heat exchanger in PCCS(Passive containment cooling system).Depending on the discipline of the pressure change in the header,the influence of the header diameter on the flow distribution has been investigated.According to different types of distribution and ways of pressure control in the header,three different flow distribution types(type Ⅰ,type Ⅱ and type Ⅲ) and three regions of pressure control(strong pressure recovery control region,weak pressure recovery control region and the combination control of pressure recovery and pressure loss region).For different types of flow distribution,the influence of header diameter on the flow distribution can be concluded that for a better flow distribution,for the type Ⅰflow distribution,the header diameter should be increased;for the type Ⅱ flow distribution,the header diameter should be decreased;and for the type Ⅲ flow distribution,the flow distribution should be increased.更多还原