不凝结气体对蒸汽喷射器性能影响的数值模拟  

Numerical Simulation of the Effect of Non-condensed Gas on the Performance of Steam Ejector

作　　者：李浩 陈学 卢涛[1] LI Hao;CHEN Xue;LU Tao(College of Mechanical and Electrical Engineering,Bejing University of Chemical Technology)

机构地区：[1]北京化工大学机电工程学院

出　　处：《化工机械》2024年第1期56-61,138,共7页Chemical Engineering & Machinery

摘　　要：以空气作为掺混在蒸汽中的不凝结气体,基于Fluent对蒸汽喷射器内蒸汽和过冷水的直接接触凝结现象进行了CFD数值模拟。研究发现:随着空气质量分数的增加,混合段内的轴向压力升高,凝结冲击的位置向出口方向移动,凝结冲击的强度降低,蒸汽对过冷水的引射作用减弱;蒸汽入口压力增大,混合段和扩压段内的轴向压力降低,对过冷水的引射作用增强。Through taking the air as a non-condensing gas mixed in the steam and the CFD simulation,the directly-contacted condensation phenomenon between steam and supercooled water in the steam ejector was simulated to find that,with the increase of air mass fraction,the axial pressure of mixing section rises and the position of condensation impact moves towards the exit direction,the strength of condensation impact decreases and the ejection effect on supercooled water becomes weakened.As the steam inlet pressure increases,the axial pressure in the mixing section and diffuser section decreases and the ejection effect on supercooled water becomes enhanced.

关 键 词：蒸汽喷射器 直接接触凝结 不凝结气体 蒸汽入口压力 

分 类 号：TK172[动力工程及工程热物理—热能工程]