变曲率螺旋管内两相流型变迁模拟研究
Simulation of Two-phase Flow Pattern Transition in Helical Tubes With Variable Curvature
张艳婷 1庄乃亮 1李阳阳 1赵浠君 1赵行斌 2汤晓斌1
作者信息
- 1. 南京航空航天大学核科学与技术系,南京 211106;空间核技术应用与辐射防护工业和信息化部重点实验室,南京 211106
- 2. 空间核技术应用与辐射防护工业和信息化部重点实验室,南京 211106;南京航空航天大学航天学院,南京 211106
- 折叠
摘要
为进一步提升蒸汽发生器螺旋换热管的传热传质性能,本文提出了一种盘管曲率周期性变化的变曲率螺旋管改进方案.并对变曲率螺旋管内气液两相流动特性开展了数值模拟研究.基于有限元方法,建立了单根变曲率螺旋管内流体六面体结构化网格,采用VOF模型捕捉相界面,分析管内液相流场分布特性.研究发现,在同一根变曲率螺旋管内不同位置管段的两相分布与流型并不相同,部分管段出现了分层流-波状流-塞状流的间歇性流型变迁现象.这是由于盘管曲率的周期性改变,使得管内液相所受离心力不断改变,两相分布在空间位置及时间分布上均不断变化,产生了两相流型变迁的现象.
Abstract
To further advance the performance of heat and mass transfer in the helical heat ex-change tubes of the steam generator,this paper presents an enhancement plan involving a helical tube design featuring periodic curvature changes.A numeric simulation study was conducted to examine the characteristics of a gas-liquid two-phase flow within tubes of varying curvature.By applying the finite element method,a hexahedral structured grid was established for the fluid flow within a single helical tube.The Volume of Fluid(VOF)model was utilized to capture the phase boundary,and the characteristics of the in-tube liquid phase flow field distribution were analyzed.The research found differing two-phase distributions and flow patterns in different sections within the same helically-curved tube,with some sections displaying an intermittent transition phenomenon from stratified flow to wavy flow,and then to plug flow.This phenomenon is attributed to the peri-odic variations in coil curvature,which in turn continuously alters the centrifugal force experienced by the in-tube liquid phase,leading to a dynamically changing two-phase distribution in both spatial and temporal contexts.
关键词
气液两相流/变曲率螺旋管/流型变迁/蒸汽发生器/离心力Key words
two-phase flow/variable curvature helical tube/flow pattern transition/steam genera-tor/centrifugal force引用本文复制引用
基金项目
国家自然科学基金(12105142)
江苏省博士后科研资助(2021K387C)
国创计划(202210287046Z)
国创计划(202310287152Y)
出版年
2024
NETL
NSTL
万方数据