摘要
气液两相射流直接接触凝结现象广泛存在于自然界,在航天液体火箭发动机及能源核电等领域具有重大的应用需求.气液两相射流凝结过程牵涉冷凝相变、强湍流和界面多尺度等剧烈的瞬态特性,致使气液界面能质输运与压力波动机制难以准确描述.本文首先简要回顾了气液两相射流凝结现象在关系国计民生的重要工业过程中的应用,接着从气液两相射流典型界面过程出发,重点回顾了射流气羽连续相界面的稳态特征、凝结流型图和射流喷射长度,介绍了射流凝结流场结构相关的射流速度场与温度场的稳态平均特性,分析了射流凝结传热系数和数理建模相关的若干进展,然后综述了射流凝结诱发的压力波动特性方面的研究进展.最后简要指出存在的问题和面临的挑战,提出实验与理论研究、数理建模等未来的发展方向.
Vapor jet condensation in fluids is frequently encountered in nature and has extensive applications in aerospace rocket engines,nuclear engineering,and power production.Jet condensation results in severe transient characteristics,including multiscale interfaces and highly turbulent flows.Obtaining an accurate description of the micro-mechanisms of the interface evolution and pressure oscillation and acoustic wave generation is difficult because of the transient characteristics.In this study,the spatiotemporal evolution of gas-liquid multiscale interfaces was systematically reviewed,focusing on the condensation regime map,interfacial behavior,and jet penetration length.Then,the mechanisms regulating vortex structures and their interactions with the multiscale liquid-vapor interface were introduced.Finally,the physical mechanisms of the heat and mass transfer and the resulting pressure oscillation due to the evolution of the multiscale liquid-vapor interface were reviewed.This review summarizes the development of steam jet condensation in pools and pipes and shows values and possible directions for future research,thereby offering a guide for the research and applications of steam jet condensation.
作者
徐强
郭烈锦
XU Qiang;GUO LieJin(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2020年第10期1274-1287,共14页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:51888103和51706174)资助项目。
关键词
气液两相流
直接接触凝结
射流
界面演化
压力波动
gas-liquid two phase flow
direct contact condensation
jet
interfacial evolution
pressure oscillation
