过冷水中蒸汽射流自旋凝结的实验研究  

Experimental Study of the Condensation of Swirling Steam Jet in Subcooled Water

作　　者：丛红钏 韩沛东 周子棋 孙中国[1] 席光[1] CONG Hongchuan;HAN Peidong;ZHOU Ziqi;SUN Zhongguo;XI Guang(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2025年第2期23-31,共9页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51922085)。

摘　　要：针对蒸汽射流自旋凝结过程中的复杂流动和相变展开实验研究,采用新型X型旋流压力喷嘴实现了蒸汽射流的自旋流动,分析了不同流量下旋转气泡的冷凝模式以及相关参数的演化规律,包括气泡半径、生长速率、溃灭速率、气泡质心最大迁移速度和溃灭频率。结果表明:蒸汽射流自旋凝结可划分为光滑生长气泡机制、过渡气泡机制和粗糙生长气泡机制。在离心力作用下,凝结过程中可能出现颈部螺旋发展和气泡顶部凸起不规则变形等典型行为。随着质量流量的增加,气泡冷凝时间缩短,生长速率有所增加,气泡半径和溃灭速率呈现非线性变化,气泡质心最大迁移速度范围为24.3~73.23 m/s,气泡溃灭频率为20~302 Hz。同一质量流量下,气泡可能在不同方向上发生冷凝并出现之字形运动轨迹。气泡质心偏离喷嘴中心轴线角度增大,有助于减小气泡溃灭过程中发生回弹的次数,对气泡生长速率、溃灭速率和气泡质心最大迁移速度产生非线性影响。研究结果可为开发和优化相关工业领域中的冷凝技术提供重要的理论依据。To show the complex flow and phase change in the condensation of swirling steam jet,an experimental study was conducted in this paper.Firstly,a novel Xtype swirl pressure nozzle was employed to achieve the swirling flow of the steam jet.Next,the condensation regimes of swirling bubbles and the evolution of related parameters were analyzed at various mass flow rates,and these parameters included bubble radius,growth rate,collapse rate,maximum migration speed of the bubble center,and collapse frequency.The results show that there were three condensation regimes:smooth grown bubble regime,transition regime,and rough grown bubble regime.Under the influence of centrifugal force,typical behaviors such as neck torsion and irregular deformation of the jet bulge at the top of bubbles may occur during the condensation process.As the mass flow rate increased,the bubble condensation time decreased,the growth rate increased,and both bubble radius and collapse rate exhibited nonlinear changes.The maximum migration speed of the bubble center ranged from 24.3m/s to 73.23m/s,while the bubble collapse frequency varied between 20Hz and 302Hz.At the same mass flow rate,bubbles may condense in different directions and display a zigzag motion trajectory.An increasing in the deviation angle of the bubble center relative to the central axis of the nozzle helps reduce the rebound number during the collapse,exerting a nonlinear impact on the bubble growth rate,collapse rate,and maximum migration speed of the bubble center.This study can provide a theoretical support to some extent for the development and optimization of condensation technologies in related industrial fields.

关 键 词：旋转蒸汽射流 X型旋流压力喷嘴 气泡凝结特性 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]