瞬变运动条件对竖直管内搅混流向环状流转变边界的影响研究  

Study on Influence of Transient Motion Conditions on Transition Boundary of Churn Flow to Annular Flow in Vertical Pipe

作　　者：马文慧 曹夏昕 谢添舟 MA Wenhui;CAO Xiaxin;XIE Tianzhou(Key Laboratory of Nuclear Power System&Equipment of Heilongjiang Province,Harbin Engineering University,Harbin 150001,China;Key Laboratory of Thermal and Hydraulic Technology for Nuclear Reactors of China Nuclear Power Corporation,Chengdu 610041,China)

机构地区：[1]黑龙江省核动力装置性能与设备重点实验室,黑龙江哈尔滨150001 [2]中核集团核反应堆热工水力技术重点实验室,四川成都610041

出　　处：《原子能科学技术》2024年第3期698-704,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金(11975085)。

摘　　要：船舶在航行过程中处于海洋瞬变运动环境,两相流动常处于瞬变运动状态,两相流型可能与陆基条件时不同,进而影响流动传热特性,准确判别瞬变运动条件下两相流型对两相阻力和传热的计算具有重要意义。本文针对摇摆和升潜两种典型海洋运动条件,引入运动产生的瞬变外力场,构建了瞬变运动条件下搅混流-环状流转变准则,该准则也可适用于竖直向上和倾斜流动。通过静止和瞬变运动条件下实验数据对转变准则模型计算结果进行了验证,与实验结果符合很好。通过对转变准则进行分析,绘制了搅混流-环状流转变曲线,获得了运动参数对流型转变边界的影响规律。A ship is affected by the transient ocean motion during navigation,and the two-phase flow is often in a transient motion state.The two-phase flow pattern may be different from the land-based conditions,which may affect the flow and heat transfer characteristics.Therefore,it is significant to accurately distinguish the two-phase flow pattern under transient motion conditions for the calculation of two-phase resistance and heat transfer.In this paper,by using a separated flow model,the momentum equations for the liquid film and gas core of annular flow were listed separately.Meanwhile,based on introducing the transient external force field generated by the motion under two typical ocean motion conditions of rolling and heaving and considering the effects of buoyancy and additional inertial forces,a transition criterion which was suitable for churn flow to annular flow under transient motion conditions was also proposed.This criterion can also be applied to vertical upward and inclined flows.The calculation results of the transition criterion model were verified through experimental data under static and transient motion conditions,and there is good agreement with the experimental results.The results show that when the superficial liquid velocity is less than 0.35 m/s,the transition curve approximates a vertical curve,while the superficial liquid velocity is larger than 0.35 m/s,the thickness of the liquid film increases,and the axial motion of the liquid phase plays a major role in the flow pattern transformation.Similarly,by comparing the calculation results of the transition from churn flow to annular flow under different motion conditions with experimental data,it can be found that within the existing parameter range,the additional force introduced by rolling motion has little effect on the continuous gas phase at the center of the channel.Therefore,although the thickness distribution of the liquid film on the wall is uneven due to the influence of rolling motion,the annular flow structure will not be damaged,an

关 键 词：摇摆运动 升潜条件 搅混流 环状流 转变准则 

分 类 号：TL33[核科学技术—核技术及应用]