摘要
在自然循环工况下,倒U型管蒸汽发生器(inverted U-tube steam generator,UTSG)内有部分倒U型管会发生倒流现象,严重影响一回路系统的自然循环能力.采用计算流体力学(computational fluid dynamics,CFD)方法对自然循环工况下UTSG一次侧流体的流动特性进行三维数值模拟研究.结果表明:在低质量流量下,倒流集中发生在短管侧,而等长倒U型管中同时出现了倒流和正流的现象,这与入口腔室分配给各个倒U型管的初始质量流量有关.随着UTSG入口质量流量的增加,UTSG倒流管数减少;随着一次侧入口温度的升高,UTSG进出口压降为负值,压降绝对值逐渐增大,倒流管数增多.
Under natural circulation condition,reverse flow occurs within some tubes in inverted U-tube steam generator(UTSG),which can seriously influence the capacity of natural circulation of primary loop system.In this study,the computational fluid dynamics(CFD)method is used to simulate the primary side flow characteristics of UTSG under natural circulation condition.The results show that at a low mass flow rate,reverse flow mostly occurs at the short pipe side,while reverse flow as well as normal flow simultaneously occur in equal length U-tubes.This phenomenon is related to the initial mass flow rate assigned to each inlet tube by the inlet chamber.The less the initial mass flow rate is,the more likely the reverse flow occurs.With the increase of the inlet mass flow rate of UTSG,the number of the reverse flow pipes of UTSG is reduced.With the increase of the primary inlet temperature,the pressure drop of UTSG is negative,the absolute value of the difference of pressure increases gradually,and the number of the reverse flow tubes increases.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第6期831-837,共7页
Journal of Xiamen University：Natural Science
基金
福建省自然科学基金(2016J05137)
关键词
自然循环
倒流
计算流体力学
倒U型管蒸汽发生器
natural circulation
r everse flow
computational fluid dynamcs （CFD） inverted U- tube steam generator （UTSG）
